Abstract:
Projection capabilities are provided in consumer electronic devices that are used for the capture or reproduction of images, such as digital still image cameras, digital video cameras, cellular telephones, DVD players and other digital video players. Such devices can display images to several people simultaneously in a manner that is more convenient than the use of miniature onboard displays. The incorporation of image projection capabilities also enables image generation to be provided by the device itself without the necessity of an independent display device.

Description:
This application claims priority under 35 U.S.C.§120 as a continuation of U.S. patent application Ser. No. 10/793,075, filed Mar. 4, 2004, entitled “CAMERAS AND VIDEO PLAYERS HAVING IMAGE PROJECTION CAPABILITIES” 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     Embodiments of the invention relate to consumer electronic devices such as digital still image cameras, digital video cameras, cellular phones and DVD players, and more particularly to consumer electronic devices having image projection capabilities. 
     2. Related Technology 
     Today&#39;s consumers enjoy a wide variety of electronic devices that allow the user to record or reproduce images. Digital still cameras allow the user to take photographs that are digitized and stored as data in a computer readable medium. Cellular telephones have begun to incorporate digital camera features as well. Digital video cameras are also becoming more prevalent and provide similar recording and storage features for video images. Both digital still cameras and digital video cameras typically have the capability of interfacing with a video monitor such as a television or computer to display stored images. 
     Video reproduction devices such as DVD players are also commonplace. These devices are typically used in conjunction with a separate television or other video monitor to display the video images stored on the DVD. 
     Consumer electronic devices such as the aforementioned devices all require a way of displaying images that are recorded by or rendered by the devices. Currently such displays are provided by display screens that are integral with the device, or by display devices such as televisions that must be connected to the device. This imposes limitations on the usefulness of these devices. In devices that have built in displays, such as cameras, the displays are typically very small and cannot display images that are easily viewable by several people at the same time. In devices such as DVD players that require connection to a separate display, the use of the device is typically restricted to an area near the display to which the device is connected. 
     SUMMARY OF THE INVENTION 
     Embodiments in accordance with the invention provide projection capabilities in various types of well-known consumer electronic devices that are used for the capture or reproduction of images. Such consumer electronic devices may include digital still image cameras, digital video cameras, cellular telephones, DVD players and other digital video players. By incorporating image projection capabilities into these devices, the devices can display images to many people simultaneously in a manner that is more convenient than the use of miniature onboard displays. The incorporation of image projection capabilities also enables image generation to be provided by the device itself without the necessity of a separate display device. 
     In accordance with first embodiments of the invention, projection capabilities may be integrated with a camera. The projection capabilities may be provided by positionable projection optics that may be moved with respect to the camera body to change the direction in which an image is projected. Processing of the image data within the camera may be performed to properly orient the projected image based on the position of the projection optics with respect to the camera. These features may be integrated with a digital still camera, a digital video camera, or a cell phone having image recording or display capabilities. 
     In accordance with one aspect of the first embodiments, a device for image display may comprise positionable projection optics that are integral with the device body and movable with respect to the device body for projecting an image in different directions with respect to the device body, a projection display for generating an image to be projected by the projection optics, a light source for directing light through the projection display toward the projection optics, a position sensor for detecting the position of the projection optics with respect to the device body, and an image translator for translating image data supplied to the projection display in accordance with a signal from the position sensor indicating the position of the projection optics so that the image displayed on the projection display produces a projected image that is correctly oriented with respect to the device. 
     In accordance with another aspect of the first embodiments, an image display device operating method may include detecting the position of positionable projection optics of the image display device with respect to the image display device, 
     translating image data for an image to be displayed in accordance with a signal indicating the position of the projection optics, forming an image on a projection display using the translated image data, and projecting the image formed on the projection display, wherein the translation of the image data causes the projected image to maintain a predetermined orientation with respect to the device irrespective of the position of the positionable projection optics. 
     In accordance with another aspect of the first embodiments, a computer readable medium may store programming instructions for controlling an image display device to perform operations that include detecting the position of positionable projection optics of the image display device with respect to the image display device, translating image data for an image to be displayed in accordance with a signal indicating the position of the projection optics, forming an image on a projection display using the translated image data, and projecting the image formed on the projection display, wherein the translation of the image data causes the projected image to maintain a predetermined orientation with respect to the device irrespective of the position of the positionable projection optics. 
     In accordance with second embodiments of the invention, projection capabilities may be integrated with a camera by providing a separate projector portion that is tethered to the camera by a cable. The projector portion may be held in the user&#39;s hand to direct a projected image at a desired target. These features may be integrated with a digital still camera, a digital video camera, or a cell phone having image recording or display capabilities. 
     In accordance with one aspect of the second embodiments, a device for image capture and display may comprise a device body including an image sensor, image capture optics for directing an image onto the image sensor, and image data storage for storing data representing a captured image, and a hand-held projector portion that is coupled to the device body by a flexible cable for projecting an image stored in the image data storage. 
     In accordance with third embodiments of the invention, projection capabilities may be integrated with a video player such as a DVD player. The projection capabilities may be provided in a projector portion that is receivable by and separable from the body of the player. In a connected mode, data and power are supplied through physical couplings from the player to the projector portion, and in a disconnected mode, power is supplied separately to the projector portion and data is transmitted wirelessly from the player to the projector portion. 
     In accordance with one aspect of the third embodiments, a digital video player may comprise a player portion for reading a digital video storage medium and generating video data, and a projector portion for receiving the video data and generating a projected image from the video data, wherein the player portion is comprised of a first housing and the projector portion is comprised of a second housing that is coupleable to the first housing, wherein the player portion and the projector portion include physical interfaces for transmitting video data and power from the player portion to the projector portion when the projector portion is coupled to the player portion, and wherein the player portion and the projector portion include wireless data interfaces for transmitting video data from the player portion to the projector portion when the projector portion is not coupled to the player portion. 
     In accordance with another aspect of the third embodiments, a method of operating a digital video player may include detecting whether a projector portion of the video player is coupled to a player portion of the video player, if the projector portion is coupled to the player portion, providing video data to the projector portion through a direct coupled transmission path, if the projector portion is not coupled to the player portion, transmitting video data to the projector portion through a wireless data link, and projecting an image from the projector portion using the video data. 
     In accordance with another aspect of the third embodiments, a computer readable medium may store programming instructions for controlling a digital video player to perform operations comprising detecting whether a projector portion of the video player is coupled to a player portion of the video player, if the projector portion is coupled to the player portion, providing video data to the projector portion through a direct coupled transmission path, and if the projector portion is not coupled to the player portion, transmitting video data to the projector portion through a wireless data link. 
     In accordance with another aspect of certain embodiments of the invention, a method of operating a camera may comprise receiving an image at an image detector of the camera, storing data representing the image, and projecting an image from an image projection portion of the camera using the stored data so that a captured image is concurrently projected by the camera. 
     In accordance with another aspect of certain embodiments of the invention, a computer readable medium may store programming instructions for controlling a camera to perform operations comprising receiving an image at an image detector of the camera, storing data representing the image, and projecting an image from an image projection portion of the camera using the stored data so that a captured image is concurrently projected by the camera. 
    
    
     
       DESCRIPTION OF THE DRAWINGS 
       A detailed description of embodiments of the invention will be made with reference to the accompanying drawings, wherein like numerals designate corresponding parts in the several figures. 
         FIG. 1  shows an example of components of devices in accordance with first embodiments of the invention. 
         FIG. 2  shows an example of a video camera in accordance with the first embodiments of the invention. 
         FIGS. 3   a ,  3   b ,  3   c  and  3   d  show examples of components of positionable projection optics in accordance with the first embodiments of the invention. 
         FIGS. 4   a  and  4   b  show an example of a digital still camera in accordance with the first embodiments of the invention. 
         FIGS. 5   a  and  5   b  show elements of positionable projection optics of the embodiment of  FIGS. 4   a  and  4   b.    
         FIGS. 6   a  and  6   b  show an example of a cell phone in accordance with the first embodiments of the invention. 
         FIGS. 7   a  and  7   b  show elements of positionable projection optics of the embodiment of  FIGS. 6   a  and  6   b.    
         FIG. 8  shows an example of components of devices in accordance with second embodiments of the invention. 
         FIGS. 9   a  and  9   b  show examples of a digital still camera and a projector portion in accordance with the second embodiments of the invention. 
         FIG. 10  shows an example of components of video player devices in accordance with third embodiments of the invention. 
         FIGS. 11   a ,  11   b  and  11   c  show a first example of a DVD player in accordance with the third embodiments of the invention. 
         FIGS. 12   a  and  12   b  show a second example of a DVD player in accordance with the third embodiments of the invention. 
         FIGS. 13   a,    13   b  and  13   c  show a third example of a DVD player in accordance with the third embodiments of the invention. 
         FIGS. 14   a,    14   b  and  14   c  show a fourth example of a DVD player in accordance with the third embodiments of the invention. 
     
    
    
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     First Embodiments 
     First embodiments of the invention may be implemented as video cameras, still cameras, or other devices that have camera functions and that are capable of projecting images. In general terms, these embodiments include projection elements that are integral with the camera and moveable with respect to the camera body, enabling the direction of image projection to be changed with respect to the camera body. 
       FIG. 1  shows a block diagram of electronic components and other components that may be used in implementations of such embodiments of the invention. The components of  FIG. 1  include image capture optics  10  that focus an image onto an image sensor  12 . The image capture optics  10  are typically implemented using one or more lenses and the image sensor  12  is typically implemented using a CCD or CMOS device. Signals generated by the image sensor  12  are supplied to an encoder  14  that converts the image signals into a digital representation of the received image. The encoder  14  may be a still image encoder, a video encoder, or an encoder having both still image and video encoding capabilities. Image data from the encoder  14  is stored in an image data storage  16 . The image data storage  16  may be implemented using a variety of storage media, such as random access memory, fixed or removable non-volatile semiconductor memory, writable digital versatile disc (DVD) memory, or other data storage media. The image data storage may encompass a memory section where “live” incoming image data is temporarily held, as well as long-term storage where image data may be archived. Image data stored in the image data storage  16  may be accessed and decoded by a decoder  18 . The decoder  18  may supply decoded image data to a display driver  20  that drives a viewable display  22 . The viewable display  22  is typically a miniature LCD display that is used as a viewfinder of the camera. 
     The components of  FIG. 1  further include a network link  36  that is coupled to the image data storage  16  for supplying image data and related data to the image data storage  16 . The network link  36  may be implemented for a variety of data communication protocols such as serial ports or wired or wireless networks including wireless LANs and cellular telephone networks. 
     In accordance with first embodiments of the invention, image data stored in the camera may be used to generate a projected image using projection optics that are integral with the camera and movable with respect to the camera body. Elements for providing this capability are shown in  FIG. 1 . These elements include an image translator  24  that performs operations on image data supplied by the decoder  18  to rotate and flip the image as needed so that the projected image is properly oriented irrespective of the position of the projection optics. The image translator  24  may be implemented using image mapping algorithms that are executed by a programmable microprocessor. The image translator  24  supplies translated image data to a display driver  26  that drives a projection display  28 . The projection display  28  is typically implemented as a miniature LCD display through which light is projected to produce a projectable image. Light passing through the projection display  28  is received by positionable projection optics  30  that focus and direct the image. A position sensor  32  associated with the positionable projection optics  30  detects the orientation of the projection optics  30  with respect to the camera body and provides a signal to the image translator  24  representing the orientation of the projection optics  30 . The position sensor  32  may be implemented, for example, using contact sensors that sense the presence of the positionable projection optics at various positions. The position sensor  32  may also be implemented using one or more variable resistors that change resistance depending on the orientation of the positionable projection optics  30 . An optics controller  34  may also be associated with the positionable projection optics  30 . The optics controller  34  is an electronic or electromechanical device for controlling the position of elements within the projection optics  30  in response to control signals generated by the user. In alternative embodiments, the optics controller may be a purely mechanical device. 
     While the components shown in  FIG. 1  provide an example of an implementation in accordance with the first embodiments, it will be understood that alternative components may be utilized to provide the features of the first embodiments. For example, while  FIG. 1  shows the use of an encoder  14  and a decoder  18 , alternate embodiments may use other forms of image data that do not require encoding and decoding, such as bitmap image data. 
     In operation, devices in accordance with  FIG. 1  may receive and store still or video images. These images may be viewed on the viewable display  22  and may be projected by the projection optics  30 . The projected image may be a “live” image that is projected as it is being received, or may be a stored image that was previously received and stored. The user of the device may move the projection optics  30  to a variety of positions with respect to the camera, either manually or through the use of electromechanical controls, so as to control the direction in which the projected image is pointed. The orientation of the projection optics  30  is detected by the position sensor  32 , which supplies an orientation signal to the image translator  24 . The image translator  24  performs image translation based on the orientation signal so that the image presented on the projection display  28  produces a properly oriented image. 
       FIG. 2  shows an exemplary embodiment using components as illustrated in  FIG. 1 . This embodiment is implemented in a digital video camera  40 . The digital video camera  40  includes conventional elements such as image capture optics  42  and a viewfinder  44 . The digital video camera  40  further includes a projection lens  46 . The projection lens  46  is movable among various fixed positions with respect to the body of the camera. In the illustration of  FIG. 2 , the projection lens  46  points upward with respect to the camera body but is moveable to other positions that point forward, to the right, or to the left of the camera body. The projection lens  46  is movable to these positions through slots  48 ,  50 . The projection lens  46  may be moved to the different positions manually or may be moved electromechanically in response to operation of user controls. 
     An exemplary implementation of the positionable projection optics  30  and related components in accordance with first embodiments of the invention such as that of  FIG. 2  is illustrated in  FIGS. 3   a  through  3   d . As seen in  FIG. 3   a , the positionable projection optics include projection lens elements  52  that receive and focus light passed through the projection display  28 . The projection lens elements  52  typically include one or more lenses that focus the projected image through movement of the lenses. Light is supplied to the projection display  28  by a light source  54  that is positioned behind the projection display  28 , such as a lamp or a high powered LED such as a super-bright white LED. The positionable projection optics further include a ring  56  that surrounds and is rotatable about the optical path between the projection display  28  and the projection lens elements  52 . A mirror  58  is mounted to the ring  56  and is pivotable with respect to the ring  56  such that it can be moved between a position that is approximately perpendicular to the ring, as shown in  FIG. 3   a , and a position that is at approximately a 45 degree angle to the ring  56 , as shown in  FIG. 3   b . When the mirror  58  is perpendicular to the ring  56 , it is outside of the optical path and does not affect the projected image. When the mirror  58  is pivoted to a 45 degree angle with respect to the ring, it is within the optical path and causes the optical path to be diverted at a 90 degree angle. 
     The mirror  58  and the ring  56  may be mechanically coupled to the projection lens elements  52  so that movement of the projection lens elements  52  produces a corresponding movement of the mirror  58  and rotation of the ring  56 . Alternatively, the mirror  58  and ring  56  may be moved automatically by an electromechanical control system that also moves the projection lens elements  52  or that operates in response to manual movement of the projection lens elements  52 . 
     For purposes of the embodiments described herein, it is assumed that the projection display  28  is mounted so that its broad surfaces are parallel to the bottom of the camera. However in further embodiments the projection display  28  may be mounted in a different orientation and its operation and the operation of the positional projection optics may be altered accordingly. 
       FIG. 3   a  shows the positionable projection optics in a first orientation corresponding to the up position in the camera of  FIG. 2 , in which the projection lens elements are pointed up with respect to the camera body so that an image is projected upward. In this orientation, the mirror  58  is positioned outside of the optical path. This enables an image  60  formed on the projection display  28  to be projected upward from the camera. The image  60  displayed on the projection display  28  is oriented by the image translator to produce a correctly oriented projection image  62  based on the position of the projection lens elements  52 , the ring  56 , and the mirror  58 . 
       FIG. 3   b  shows the positionable projection optics in a second orientation corresponding to the forward position in the camera of  FIG. 2 , in which the projection lens elements  52  are pointed forward with respect to the camera body so that an image is projected forward. In this orientation, the mirror  58  is positioned within the optical path at a 45 degree angle to the ring  56  so that light directed upward through the projection display  28  is deflected forward at approximately a 90 degree angle. The reflection produced by the mirror inverts the image formed on the projection display  28 . Consequently, the image translator operates to invert the image  60  formed on the projection display  28  so that the projection image  62  is properly oriented when it exits the projection lens elements  52 . This translation may be seen by comparison of  FIGS. 3   b  and  3   a.    
       FIG. 3   c  shows the positionable projection optics in a third orientation corresponding to the right side position in the camera of  FIG. 2 , in which the projection lens elements  52  are pointed toward the right side with respect to the camera body so that an image is projected to the right of the camera body. In this orientation, the mirror  58  is positioned within the optical path at a 45 degree angle to the ring  56 , and the ring  56  is rotated about the optical path by 90 degrees with respect to its position when the lens elements  52  are in the forward position. This rotation of the ring causes of the mirror  58  to reflect light to the right of the camera. Rotation of the ring also causes the projected image  62  to be rotated 90 degrees from its orientation when projected using the forward position. Consequently, the image translator operates to rotate the image  60  formed on the projection display  28  by 90 degrees in response to the rotation of the ring  56 , and to invert the image in response to the position of the mirror  58 . Thus the projection image  62  is properly oriented when it exits the projection lens elements  52 . This translation may be seen by comparison of  FIG. 3   c  to  FIGS. 3   a  and  3   b.    
       FIG. 3   d  shows the positionable projection optics in a fourth orientation in which the projection lens elements  52  are pointed at a 45 degree angle between the front and right side of the camera body. Although this orientation is not achievable by the camera of  FIG. 2 , further embodiments discussed below employee alternative projection optics that enable 360 degree rotation of the projection lens elements with respect to the camera body. In the orientation shown in  FIG. 3   d , the mirror  58  is positioned within the optical path at a 45 degree angle to the ring  56 , and the ring  56  is rotated about the optical path by 45 degrees with respect to its position when the lens elements  52  are in the forward position. Rotation of the ring  56  causes the projected image to be rotated 45 degrees from its orientation when projected using the forward position. Consequently, the image translator operates to rotate the image  60  formed on the projection display  28  by 45 degrees in response to the rotation of the ring  56 , and to invert the image in response to the position of the mirror  58 . Thus the projection image  62  is properly oriented when it exits the projection lens elements  52 . This translation may be seen by comparison of  FIG. 3   d  to  FIGS. 3   a  and  3   b.    
     While the use of a ring to support the mirror is preferred for the embodiment shown in  FIG. 2 , alternative structures may be used to support the mirror in a manner that allows it to be moved into and out of the optical path and rotated about the optical path. 
     Further, while the embodiment of  FIGS. 3   a - 3   d  utilize a simple reflecting mirror  58  that moveable into and out of the optical path, in alternative embodiments an electro-optical reflection device may be used in place of the mirror. The electro-optical reflection device is electrically controllable to transition between a primarily transmissive state and a primarily reflective state. This allows the electro-optical reflection device to remain in the optical path at all times and to be switched between reflective and transmissive states depending on the orientation of the projection lens elements. The electro-optical reflective device may be implemented using an LCD shutter device that is electronically switchable between a transmissive state and a reflective state. 
       FIGS. 4   a  through  4   b  show another exemplary embodiment using components as illustrated in  FIG. 1 . This embodiment is implemented in a digital still camera  70 . The digital still camera  70  includes conventional elements such as an optical view finder  72 , an LCD view finder  74 , and user controls  76 . The digital still camera  70  further includes a projection lens section  78 . The projection lens section  78  is movable between an upward-pointing position and a sideward-pointing position, and when in the sideward-pointing position the projection lens may be rotated 360 degrees with respect to the camera body. The projection lens  78  may be manually moved by the user or may move electromechanically in response to operation of controls by the user. In the illustration of  FIG. 4   a  the projection lens section  78  is shown protruding from the camera body, however the projection lens section  78  is also storable in a retracted position such as shown in  FIG. 4   b.    
     Details of the projection lens section  78  are shown in  FIGS. 5   a  and  5   b .  FIG. 5   a  shows the projection lens section  78  in the upward-pointing position. The projection lens section includes an outer housing  80  within which is contained a pivotable mirror  82 . The housing  80  is rotatable with respect to the camera body, and the mirror  82  is coupled to the housing  80  so as to be rotatable with the housing. Projection lens elements  84  are also coupled to the housing  80  and are pivotable with respect to the housing. In the upward-pointing position as shown in  FIG. 5   a , the lens elements  84  are pivoted to an upward-pointing position, and the mirror  82  is pivoted out of the optical path. Consequently, light entering the bottom of the housing  78  passes directly through the housing  80  and out of the upward-pointing lens elements  84  to project an image upward from the camera. In contrast, in the sideward-pointing position shown in  FIG. 5   b , the lens elements  84  are pivoted to a sideward-pointing position, and the mirror  82  is pivoted into the optical path at a 45 degree angle. Consequently, light entering the bottom of the housing  78  is deflected by the mirror  82  at a 90 degree angle with respect to its original path toward the sideward-pointing lens elements  84  to project an image sideways from the camera. Position sensors track the rotational position of the housing  78  and the position of the mirror  82  and provide a signal to the image translator, allowing the image produced by the projection display to translated in a manner that produces a properly oriented display. 
     While the embodiment of  FIGS. 4   a  through  4   b  shows the use of a conventional reflecting mirror the projection optics, in alternative embodiments an electro-optical reflective device may be substituted for the mirror  82 , as described above. Further, while the embodiment of  FIGS. 4   a  through  4   b  shows the use of the projection optics of  FIGS. 5   a  through  5   b  in a still image camera, similar projection optics may be implemented in a video camera. 
       FIGS. 6   a  through  7   b  show another exemplary embodiment using the elements illustrated in  FIG. 1 . This embodiment provides image or video projection capabilities in a cellular phone or other networked communication device.  FIG. 6   a  shows portions of a folding-type cellular phone  90 . The cellular phone includes an image capture lens  92  for capturing still or video images. As shown in  FIG. 6   b , the cellular phone further includes a viewable display  94  that may be used for displaying video or still images that have been captured by the cellular phone or received by the cellular phone. The cellular phone also includes a keypad and other user controls  96 . 
     The cellular phone in accordance with this exemplary embodiment also provides a projection feature for projecting video or still images that have been captured by the cellular phone, or that have been received by the cellular phone through a network link, or that are stored in the cellular phone on a fixed or removable data storage medium. In the illustrated embodiment, the projection optics are located in the hinged portion  98  of the phone body. However, in other implementations, the projection optics may be located in a different part of the phone body. Other implementations may also be provided in unit-body type cellular phones that do not have a hinged structure as shown in  FIG. 6   b.    
       FIGS. 7   a  and  7   b  illustrate the operation of projection elements of the embodiment of  FIGS. 6   a  and  6   b .  FIG. 7   a  shows the hinged portion of the cellular phone body, including a projection lens section  100  that extends outward from the hinged portion  98  of the cellular phone. The projection lens section  100  of this embodiment is similar to the projection lens section of the preceding embodiment, in that it is movable between a retracted position within the cellular phone housing and an extended position in which it extends outward from the cellular phone housing.  FIG. 7   a  shows the projection lens section  100  in a straight extended position, in which the projection lens elements  100  are pointed sideward with respect to the cellular phone housing.  FIG. 7   b  shows the projection lens section  100  in an angled position, in which the projection lens elements are oriented at a 90 degree angle with respect to the cellular phone body. In this position, the projection lens section  100  may be rotated through 360 degrees with respect to the cellular phone body. The projection lens section  100  may be implemented in a manner similar to that shown in  FIGS. 5   a  and  5   b , in that it includes a rotatable housing, a pivotable mirror or electro-optic reflection device, and pivotable projection lens elements. Depending on the implementation, the projection lens  100  may be extended, pivoted and rotated by the user manually, or may be moved electromechanically in response to operation of user controls. 
     The first embodiments of the invention are not limited to the exemplary embodiments described herein. Rather, a variety of alterations and additions may be made while maintaining the features of an image capture device having a positionable projection optics that are integral with the image capture device and movable with respect to the image capture device. 
     Second Embodiments 
     A variety of further embodiments of the invention may be implemented as video cameras or still image cameras that are capable of projecting images by means of a projector portion that is tethered to the camera body by a flexible cable. The projector portion may be held in the hand of a user, enabling the user to manually direct the projected image toward a desired target. 
       FIG. 8  shows a block diagram of electronic components and other components that may be used in implementing such embodiments of the invention. The components of  FIG. 8  include components similar to those of  FIG. 1 , including image capture optics  10 , an image sensor  12 , an encoder  14 , an image data storage  16 , a decoder  18  that supplies decoded image data to a display driver  20  for a viewable display  22 , and a display driver  26  that drives a projection display  28  for projecting an image through projection optics  30 . It should be understood that alternative components may be utilized to provide the features of the first embodiments. For example, while  FIG. 8  shows the use of an encoder  14  and a decoder  18 , alternate embodiments may use other forms of image data that do not require encoding and decoding, such as bitmap image data. 
     In accordance with one example of the second embodiments of the invention, the projection display  28  and projection optics  30  are provided in a housing  102  that is tethered to the camera body by a flexible cable  104  through which power and data are supplied. This enables the user to hold the housing and manually direct the projected image in any desired manner. The housing  102  and flexible cable  104  may be separate from and detachably coupled to the camera body, or may be retractable within the body of the camera for storage when not in use. 
       FIGS. 9   a  and  9   b  show an exemplary embodiment using components as illustrated in  FIG. 8 . This embodiment is implemented in a digital still camera  70 . The digital still camera  70  includes conventional elements such as an optical view finder  72 , an LCD view finder  74 , and user controls  76 . The digital still camera  70  further includes a projection lens section  106  that is tethered to the camera  70  by a flexible cable  104 . The projection lens section  106  may be held in the hand of a user and pointed toward any desired target to project an image onto the target. The camera may be operated in various projection modes, including a live mode in which images are projected as they are captured by the camera, and a stored mode in which previously captured images are projected. 
       FIG. 9   b  shows details of an example of a projection lens section  106 . The projection lens section  106  includes a housing  102  that contains a projection display  28  and projection optics  30 . The projection optics  30  may include adjustable focusing elements for focusing the projected image. The projection display is typically implemented using a miniature LCD display. A light source  108  such as a lamp or a high powered LED such as a super-bright white LED is oriented behind the projection display as a source of illumination. 
     In embodiments in which the cable is detachable from the camera body, the cable  104  may be terminated by a serial port coupling that couples to a serial port connector in the camera body. The serial port may conform to a standardized serial data and power protocol such as USB or FireWire. 
     While the exemplary embodiment illustrated in  FIGS. 9   a  and  9   b  provides a light source  108  and projection display  28  in the projection lens section  106 , in one alternative embodiment the light source  108  and the projection display  28  may be provided in the camera body, and light passed through the projection display  28  may be carried to the projection optics  30  through an optical fiber or optical fiber bundle in the flexible cable. In another alternative embodiment, the light source  108  may be located in the camera body, and the projection display  28  and the projection optics  30  may be located in the housing  106 . Light may be carried to the projection display  28  and the projection optics  30  from the light source  108  through an optical fiber or optical fiber bundle in the flexible cable. The flexible cable in this embodiment may also contain electrical wire for carrying data and power to the projection display  28 . 
     Further, while the embodiment of  FIG. 9   a  shows the use of the projection optics of  FIG. 9   b  in a still image camera, similar projection optics may be implemented in a video camera. 
     The second embodiments of the invention are not limited to the exemplary embodiments described herein. Rather, a variety of alterations and additions may be made while maintaining the features of an image capture device having separate hand-held projection optics that are tethered to the device by a flexible cable. 
     Third Embodiments 
     A variety of further embodiments of the invention may be implemented in video players that include projectors that are receivable by and physically separable from the main body of the video player. The player is capable of producing an image from video data stored in a digital video storage medium such as a DVD. The projector may be received in a receiving portion of the player, causing the projector to be physically coupled to the player and establishing physical connections between power and data lines of the player and the projector. The projector may also be detached from the receiving portion of the player. When detached, video data and control signals are transmitted wirelessly between the player and the projector, and power is supplied to the projector separately. This enables the player and the projector to be coupled together and used as a unitary projection device, and allows the projector to be separated from the player and placed in a desired location for projecting an image without the need to move the entire player device. 
       FIG. 10  shows a block diagram of electronic components and other components that may be used in embodiments of video players providing the aforementioned features. The video player of  FIG. 10  includes a player portion  110 . A projector portion  112  is coupled to the player portion  110  in a receiving portion of the player housing that is complementary to the shape of the projector portion  112 . The player portion  110  and projector portion  112  are preferably structured so that the projector portion  112  is received by a receiving portion of complementary shape in the player portion  110 . Latches of various types (not shown) may be used to secure the projector portion  112  to the player portion  110 . 
     The player portion  110  may include a digital video storage medium  114  such as a DVD, hard disk, or other fixed or removable data storage medium. A video data reader  116  such as a DVD reader reads video data from the digital video storage medium  114  and supplies the data to a video decoder  118 . The video decoder  118  supplies decoded video data to a display signal generator  120  that produces a displayable image signal for a television or other display device. The video decoder  118  also supplies data to a physical data interface  122  such as a set of conductive contacts that couple data to the projector when the projector is attached to the player, and to a wireless data interface  124  that transmits data to the projector when the projector is detached from the player. The wireless data interface  124  may be an 802.11a/b/g interface, a Bluetooth interface, or another high-bandwidth wireless interface. The player portion  110  also includes a power source  126  that receives power from a standard household electrical service through a power cord (not shown), supplies power to elements within the player portion  110 , and couples power to the projector portion  112 . The player portion also typically contains components (not shown) for decoding audio data and producing an audio signal. 
     The projector portion  112  includes a physical data interface  130  that is complementary to the physical data interface  122  of the player portion  110  for receiving data signals from the player portion  110  when the projector portion  112  is attached to the player portion  110 . The projector portion  112  also includes a wireless data interface  132  for receiving wireless transmissions of data from the player portion  110  when the projector portion  112  is detached from the player portion  110 . A display driver  134  receives video data from the physical data interface  134  or the wireless data interface  132  and supplies driving signals to a projection display  136 . The projection display  136  is typically implemented as a miniature LCD display. Light is supplied from a light source, such as a lamp or a high powered LED such as a super-bright white LED, to the projection display  136  to create a projection image that is passed through projection optics  138 . The projection optics  138  typically include focusing optics that may be operated manually or electromechanically by the user. The projector portion  112  also includes a physical power interface  140  that is coupleable to the power source  126  of the player through contacts (not shown) on the player portion  110  and projector portion  112  to supply power to elements of the projector portion  112 . A portable power source  142  such as a rechargeable battery is also provided in the projector for supplying power to the projector elements when the projector is detached from the player. The portable power source  142  may be recharged from the power source  126  of the player portion  110  when the player portion  110  is coupled to the projector portion  112 . The projector portion  112  may further include a power cord (not shown) for coupling the projector portion  112  to a standard household electrical service when not connected to the player portion. When the projector portion  112  is detached from the player portion  110 , it may be powered using its power cord or the rechargeable battery. When the projector portion  112  is physically coupled to and received by the player portion  110 , it receives power from the player portion  110 , and the power cord is preferably storable within a space in the projector portion  112 . 
     Each of the player portion  110  and the projector portion  112  also includes a respective coupling sensor  144 ,  146 . Each coupling sensor detects whether the projector portion  112  is coupled to the player portion  110  and generates a control signal that is used by the elements of the player portion  110  and projector portion  112  to switch between coupled and decoupled modes of operation. While the coupling sensors  144 ,  146  appear to be in contact in  FIG. 10 , the coupling sensors may be implemented as contact sensors or as other types of sensors that do not require direct contact with each other. For example, each of the sensors may be an electromechanical sensor that detects whether the player portion  110  and the projector portion  112  are in contact. Alternatively, the coupling sensors  144 ,  146  may be electronic sensors that detect the presence or absence of signals on the data or power lines. 
     In operation, the player portion  110  reads and generates video data and signals from stored digital video content, and the video data is supplied to the projector portion  112 . The player may be controlled using controls provided on the player portion  110  or the projector portion  112 , or through the use of a wireless remote control. When the projector portion  112  is attached to the player portion  110 , video data, control signals and power are physically coupled to the projector portion  112 , and the player portion  110  and projector-portion  112  are used as an integral unit for projecting a video image. When the projector portion  112  is detached from the player portion  110 , the detachment is detected by sensors in the player portion  110  and the projector portion  112 . This causes video data and control signals to be transmitted wirelessly from the player portion  110  to the projector portion  112 , and causes power to be supplied to the elements of the projector portion  112  by the portable power source  142  within the projector portion  112  or from the power cord of the projector portion  112 . In the detached mode, the projector portion  112  may be located anywhere within transmission range of the player portion  110 , allowing the user to place the projector portion  112  in any desired location for projecting an image. Thus, for example, the user may insert a DVD into the player portion  110  and place the player portion  110  with the attached projector portion  112  in a location that is convenient for projecting the video image onto a surface such as a wall or projection screen. Alternatively, the user may detach the projector portion  112  from the player portion  110  and move the projector portion  112  to any of location that is within transmission range of the player portion  110 , allowing the projector portion  112  to be portable within the user&#39;s space so that video can be projected at desired locations while using the player portion  110  as a stationary wireless video server. 
     A variety of exemplary embodiments using the components illustrated in  FIG. 10  are now described. A first of these embodiments is illustrated in  FIGS. 11   a  through  11   c . These figures illustrate a top loading DVD player  150  that receives a DVD in a DVD loader  152  that opens upward at the top of the DVD player  150 . The projector portion  112  is coupled to the player portion  110  along a side of the player portion  110 . As shown in  FIG. 11   b , the player portion  110  includes a receiving portion  154  that is complementary to the shape of the projector portion  112  shown in  FIG. 11   c.    
     A exemplary preferred embodiment is shown in  FIGS. 12   a  and  12   b . This embodiment is similar to the embodiment of  FIG. 11   a , but differs in that it utilizes a DVD loader  162  in the form of a tray that extends outward from a rear surface of the player portion  110 . As in the embodiment of  FIG. 11   a , this embodiment has a receiving portion along one side of the player portion  110  that is complementary to the shape of the projector portion  112 . 
       FIGS. 13   a  through  13   c  show a third exemplary embodiment of the DVD player  170  having a tower configuration. The DVD player  170  includes a side mounted DVD loader that opens at a side of the tower-shaped DVD player  170 . The projector portion  112  is received in a receiving portion  174  at the top of the player portion  110  that is complementary to the shape of the projector portion  112 . 
       FIGS. 14   a  through  14   c  show a fourth exemplary embodiment of the DVD player  180  having a front loading configuration. A DVD is received in a DVD loader  182  that is oriented at the front of the player portion  110  and has a door that extends upward to enable with the user to insert a DVD into the player. The projector is received in a complementary receiving portion  184  beneath the DVD loader  182 . 
     The third embodiments of the invention are not limited to the exemplary embodiments described herein. Rather, a variety of alterations and additions may be made while maintaining the features of a video player having a separable projector portion that is receivable in a complementary receiving portion of a player portion, and that receives wirelessly transmitted data from the player portion when detached from the player portion. 
     While the embodiments described herein are illustrated in block diagrams for purposes of explanation, the blocks in those diagrams are not intended to have a one to one correspondence with discrete circuits or hardware components. In general, the devices in which embodiments of the invention are implemented are programmable electronic devices that may include a microprocessor, nonvolatile memory storing programming code for controlling the microprocessor and other hardware, rewritable nonvolatile memory such as flash memory for storing configuration data and other data, random access memory for providing a working memory space, an image encoder/decoder, a digital signal processor, and one or more communication interfaces for receiving data or signals from, supplying data or signals to or exchanging data or signals with various user input devices and external systems or devices. Each of the elements described herein may therefore be comprised of one or more such components, which may act individually or may cooperate under the control of programmed control processes or control logic circuits. 
     The devices, features and processing described herein are not exclusive of other devices, features and processing, and variations and additions may be implemented in accordance with the particular objectives to be achieved. For example, devices as described above may provide additional features not specifically described herein, or may be implemented using different electronic, mechanical or programming components to achieve features described herein. Thus, the embodiments illustrated in the figures and described above are offered by way of example only. The invention is not limited to a particular embodiment, but extends to various modifications, combinations, and permutations that fall within the scope of the claims and their equivalents.