Abstract:
A method of generating image data having disparity (or parallax) using a digital image-capturing device, as well as a digital image-capturing device are disclosed. The feature is to rotate a focus lens of the digital image-capturing device at two opposite directions or to place a refractive sheet having two opposite refractive directions in front of an image sensor of the digital image-capturing device. Also disclosed are a method and a device of generating stereoscopic image using the generated image data having disparity.

Description:
Cross Reference To Related Applications 
       [0001]    This is a division of U.S. patent application Ser. No. 11/797,250, filed on May 2, 2007. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The invention relates to the stereoscopic image technology, to the parallax/disparity technology in the stereoscopic image technology, more particularly to a method of generating image data having parallax by using a digital image-capturing device such as a digital camera or a digital camcorder, and further to the digital image-capturing device, an image sensing module, a method and device of generating a stereoscopic image. 
         [0004]    2. Description of the Prior Art 
         [0005]    Conventional stereoscopic image technology is generally classified into two types, i.e., holography technology and parallax technology. The holography technology employs the wavefront reconstruction method to make human eyes receive reflective light identical to that emitted by a real object so as to perceive the stereoscopic image. 
         [0006]    The parallax technology utilizes human&#39;s binocular disparity or parallax effect. As shown in  FIG. 1 , the left eye  11  and right eye  12  of a viewer respectively see an object  13  at a viewing angle .THETA. Because of the distance between the left eye  11  and right eye  12 , the left eye  11  and right eye  12  respectively receive an image different from each other, i.e., the images having parallax, which are then synthesized by the human brain forming the stereoscopic image of the object  13 . Based thereon, the parallax technology produces images having parallax as those received by the left eye and right eye of a human, and makes the left eye and right eye of a viewer respectively receive, through a pair of 3D spectacles, the images having parallax. The stereoscopic image is then formed in the brain of the viewer. 
         [0007]    It is difficult to produce images having parallax for forming a stereoscopic image. Generally, it requires professional and expensive photographic equipments such as a fisheye camera with dual lenses, making ordinary consumers hardly perform such production themselves. 
       SUMMARY OF THE INVENTION 
       [0008]    One objective of the invention is to provide a method of generating image data having parallax by using a digital image-capturing device for generating a stereoscopic image. 
         [0009]    Another objective of the invention is to provide a method and a device of generating a stereoscopic image, making it easy to see the stereoscopic image generated from the image having parallax. 
         [0010]    According to one aspect of the invention, there is provided a method of generating image data having parallax by using a digital image-capturing device, the digital image-capturing device using a focus lens to focus a received image onto an image sensing device, so as to convert a focused image into image data of electrical form, the focus lens being movably connected to the digital image-capturing device, the method comprising: rotating the focus lens toward a first direction by a first angle, to cause the image sensing device to obtain a first image data; and rotating the focus lens toward a second direction opposite to the first direction by a second angle, to cause the image sensing device to obtain a second image data having parallax with respect to the first image data. 
         [0011]    According to another aspect of the invention, there is provided a method of generating image data having parallax by using a digital image-capturing device, the digital image-capturing device using an image sensing device to convert a focused image into image data of electrical form, the image sensing device having a plurality of image sensing units, the method comprising: providing a refraction plate having a plurality of refraction regions, two adjacent refraction regions respectively having a first refraction direction and a second refraction direction opposite to the first refraction direction; and placing the refraction plate in contact with the image sensing device in such a way that the plurality of refraction regions respectively correspond to the plurality of image sensing units, so as to obtain, from the image sensing device, image data of the first refraction direction and image data of the second refraction direction having parallax with respect to the image data of the first refraction direction. 
         [0012]    According to further aspect of the invention, there is provided a digital image-capturing device for selectively generating image data having parallax, the digital image-capturing device comprising: a focus lens movably connected to the digital image-capturing device for focusing a received image; and an image sensing device for converting a focused image into image data of electrical form, wherein the image sensing device obtains a first image data when the focus lens is rotated toward a first direction by a first angle, and the image sensing device obtains a second image data having parallax with respect to the first image data when the focus lens is rotated toward a second direction opposite to the first direction by a second angle. 
         [0013]    According to yet another aspect of the invention, there is provided a digital image-capturing device for generating image data having parallax, the digital image-capturing device comprising: an image sensing device for converting a received image into image data of electrical form, the image sensing device having a plurality of image sensing units; and a refraction plate contacting the image sensing device and having a plurality of refraction regions respectively corresponding to the plurality of image sensing units, two adjacent refraction regions respectively having a first refraction direction and a second refraction direction opposite to the first refraction direction, causing the image sensing device to obtain image data of the first refraction direction and image data of the second refraction direction having parallax with respect to the image data of the first refraction direction. 
         [0014]    According to yet further aspect of the invention, there is provided an image sensing module, comprising: an image sensing device for converting a received image into image data of electrical form, the image sensing device having a plurality of image sensing units; and a refraction plate contacting the image sensing device and having a plurality of refraction regions respectively corresponding to the plurality of image sensing units, two adjacent refraction regions respectively having a first refraction direction and a second refraction direction opposite to the first refraction direction, to cause the image sensing device to obtain image data of the first refraction direction and image data of the second refraction direction having parallax with respect to the image data of the first refraction direction. 
         [0015]    According to still another aspect of the invention, there is provided a method of generating a stereoscopic image, comprising: providing a display device having a plurality of pixels and receiving image data of a first refraction direction and image data of a second refraction direction having parallax with respect to the image data of the first refraction direction, the first refraction direction being opposite to the second refraction direction; alternately displaying image data of the first refraction direction and image data of the second refraction direction at adjacent pixels; providing a refraction plate having a plurality of refraction regions, two adjacent refraction regions respectively having the first refraction direction and the second refraction direction; and causing the refraction regions having the first refraction direction and the refraction regions having the second refraction direction to respectively correspond to the adjacent pixels alternately displaying image data of the first refraction direction and image data of the second refraction direction, such that a viewer can see the stereoscopic image when viewing the displayed image through the refraction plate. 
         [0016]    According to still further aspect of the invention, there is provided a stereoscopic image generating device, comprising: a display device having a plurality of pixels and receiving image data of a first refraction direction and image data of a second refraction direction having parallax with respect to the image data of the first refraction direction, and alternately displaying image data of the first refraction direction and image data of the second refraction direction at adjacent pixels, the first refraction direction being opposite to the second refraction direction; and a refraction plate in close proximity to the display device and having a plurality of refraction regions, two adjacent refraction regions respectively having the first refraction direction and the second refraction direction, wherein the refraction regions having the first refraction direction and the refraction regions having the second refraction direction respectively correspond to the adjacent pixels alternately displaying image data of the first refraction direction and image data of the second refraction direction, such that a viewer can see the stereoscopic image when viewing the displayed image through the refraction plate. 
         [0017]    These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0018]    The foregoing and advantages of the invention will be appreciated more fully from the following further description thereof with reference to the accompanying drawings wherein: 
           [0019]      FIG. 1  shows the parallax effect of the left eye and right eye of a human-being. 
           [0020]      FIG. 2  shows a flow chart of a method of a specific embodiment of the invention for generating image data having parallax by using a digital image-capturing device. 
           [0021]      FIGS. 3A ,  3 B, and  3 C respectively show a status of a specific embodiment of a digital image-capturing device implementing the method of  FIG. 2 . 
           [0022]      FIGS. 4A ,  4 B, and  4 C respectively show an object image having parallax to each other obtained from the image-capturing device of  FIGS. 3A ,  3 B, and  3 C. 
           [0023]      FIG. 5  shows a flow chart of a method of another specific embodiment of the invention for generating image data having parallax by using a digital image-capturing device. 
           [0024]      FIG. 6  shows a structural diagram of a specific embodiment of a digital image-capturing device implementing the method of  FIG. 5 . 
           [0025]      FIG. 7  shows an object image having parallax obtained from the image-capturing device of  FIG. 6 . 
           [0026]      FIG. 8  shows a structural diagram of an image sensing module of a specific embodiment of the invention. 
           [0027]      FIG. 9  shows a flow chart of a method of a specific embodiment of the invention for generating a stereoscopic image. 
           [0028]      FIG. 10  shows a structural diagram of a specific embodiment of a stereoscopic image generating device implementing the method of  FIG. 9 . 
       
    
    
     DETAILED DESCRIPTION 
       [0029]      FIG. 2  shows a flow chart of a method of a specific embodiment of the invention for generating image data having parallax by using a digital image-capturing device.  FIGS. 3A ,  3 B, and  3 C respectively show a status of a specific embodiment of a digital image-capturing device implementing the method of  FIG. 2 .  FIGS. 4A ,  4 B, and  4 C respectively show an object image having parallax obtained from the image-capturing device of  FIGS. 3A ,  3 B, and  3 C. 
         [0030]    In the specific embodiment of the invention as shown in  FIG. 3A , a digital image-capturing device  3  includes an image sensing device  31  such as a CCD, and a focus lens  32 . As in a typical digital image-capturing device, the focus lens  32  focuses a received image onto the image sensing device  31 , so as to convert the focused image into image data of electrical form, where the image focusing is centered at the optical axis C. If the photographed target is the object  13  in  FIG. 1 , the image data obtained from the image sensing device  31  appear to be the image  13 A shown in  FIG. 4A , as the object  13 . 
         [0031]    In the status of  FIG. 3B , the focus lens  32  is rotated counterclockwise (the first direction) by an angle (the first angle) according to the step  21  in  FIG. 2 , such that the image is focused at the right side of the optical axis C, and the image data (the first data) obtained from the image sensing device  31  appear to be the image  13 B as shown in  FIG. 4B . Compared to the image  13 A in  FIG. 4A , the image  13 B is larger at its right half, but smaller at its left half. 
         [0032]    In the status of  FIG. 3C , the focus lens  32  is rotated clockwise (the second direction) by an angle (the second angle) according to the step  22  in  FIG. 2 , such that the image is focused at the left side of the optical axis C, and the image data (the second data) obtained from the image sensing device  31  appear to be the image  13 C as shown in  FIG. 4C . Compared to the image  13 A in  FIG. 4A , the image  13 C is smaller at its right half, but larger at its left half. Thus, there is parallax between the image  13 C and the image  13 B. 
         [0033]    The first angle can be equal or unequal to the second angle. If unequal, the obtained image data having parallax can be further properly processed by the image processing unit in a typical digital image-capturing device. 
         [0034]    The focus lens  32  can be movably connected to the digital image-capturing device  3  using various suitable mechanisms such as linkages, guides, etc., such that focus lens  32  can be rotated toward different directions by particular angles. 
         [0035]      FIG. 5  shows a flow chart of a method of another specific embodiment for generating image data having parallax by using a digital image-capturing device.  FIG. 6  shows a structural diagram of a specific embodiment of a digital image-capturing device implementing the method of  FIG. 5 .  FIG. 7  shows an object image having parallax obtained from the image-capturing device of  FIG. 6 . 
         [0036]    The digital image-capturing device  6  in  FIG. 6  includes an image sensing device  61 , which can convert the focused image into the image data of electrical form, as with the image sensing device  31  such as a CCD. The image sensing device  61  includes a plurality of image sensing units (pixels)  611 - 612 - 613 - 614 - 615 - 616 . 
         [0037]    As shown in step  51  of  FIG. 5 , the digital image-capturing device  6  in  FIG. 6  further includes a refraction plate  62  having a plurality of refraction regions formed by layers  621 A and  621 B,  622 A and  622 B,  623 A and  623 B,  624 A and  624 B,  625 A and  625 B, and  626 A and  626 B, respectively. Each refraction region is formed by stacking two layers of different materials such as polymers like polyimide, polycarbonate, etc. Two adjacent refraction regions respectively have a layer thickness different from each other. For example, the layer thickness of each of layers  621 A and  621 B forming a refraction region is different from that of each of layers  622 A and  622 B forming an adjacent refraction region. Thus, two adjacent refraction regions respectively have a refraction direction opposite to each other. For example, the refraction region formed by layers  621 A and  621 B causes the light entering this region to deflect toward the right side (R), but the adjacent refraction region formed by layers  622 A and  622 B causes the light entering this region to deflect toward the left side (L). 
         [0038]    As shown in step  52  of  FIG. 5 , the refraction plate  62  of FIG.  6  is placed in contact with the image sensing device  61  in such a way that the plurality of the refraction regions respectively correspond to the plurality of the image sensing units. For example, the refraction region formed by layers  621 A and  621 B corresponds to the image sensing unit  611 , and the refraction region formed by layers  622 A and  622 B corresponds to the image sensing unit  612 . Thus, image data having parallax, i.e., the image data formed by the light deflecting toward the right side (R), and the image data formed by the light deflecting toward the left side (L), can be obtained from the image sensing device  61 . As shown in  FIG. 7 , the light deflecting toward the right side (R) forms image  71 ,  73 , and  75 , and the light deflecting toward the left side (L) forms image  72 ,  74 , and  76 , just as the image having parallax which is formed by alternately combining a portion of image  13 B of  FIG. 4B  and a portion of image  13 C of  FIG. 4C . 
         [0039]    The image sensing device  61  and the refraction plate  62  may form an image sensing module  8  as shown in  FIG. 8 , where the image sensing units  611 ,  612 ,  613 ,  614 ,  615 , and  616  of the image sensing device  61  respectively correspond to the refraction regions of the refraction plate  62  formed by layers  621 A and  621 B,  622 A and  622 B,  623 A and  623 B,  624 A and  624 B,  625 A and  625 B,  626 A and  626 B, respectively. 
         [0040]    In order to observe the stereoscopic image generated from the first image data and the second image data having parallax with respect to the first image data obtained from  FIG. 2 , a pair of conventional 3D spectacles (not shown) can be used to make the left eye and right eye of a viewer respectively receive the first image and the second image having parallax, and then the brain of the viewer synthesizes such images to render the stereoscopic effect. 
         [0041]    In order to observe the stereoscopic image generated from the image data deflecting toward the right side (R) and the image data deflecting toward the left side (L) having parallax obtained from  FIG. 5 , the specific embodiment of the method for generating a stereoscopic image as shown in  FIG. 9  can be used.  FIG. 10  shows a structural diagram of a specific embodiment of a stereoscopic image generating device implementing the method of  FIG. 9 . 
         [0042]    As shown in step  901  of  FIG. 9 , a display device  1001  such as an LCD in  FIG. 10  includes a plurality of pixels  1002 ,  1003 ,  1004 ,  1005 ,  1006 , and  1007 , and receives a signal (S) of the image data deflecting toward the right side (R) ( 71 ,  73 , and  75 ) and the image data deflecting toward the left side (L) ( 72 ,  74 , and  76 ) having parallax obtained from procedures in  FIG. 5 . 
         [0043]    As shown in step  902  of  FIG. 9 , the display device  1001  alternately displays the image data deflecting toward the right side (R) and the left side (L) at adjacent pixels, respectively. For example, the image data ( 71 ,  73 , and  75 ) deflecting toward the right side (R) are displayed at pixels  1002 ,  1004 , and  1006 , respectively, and then the image data ( 72 ,  74 , and  76 ) deflecting toward the left side (L) are displayed at pixels  1003 ,  1005 , and  1007 , respectively. 
         [0044]    As shown in step  903  of  FIG. 9 , the refraction plate  62  as in  FIG. 6  is placed in front of the display device  1001  in  FIG. 10 . The refraction plate  62  includes a plurality of refraction regions formed by layers  621 A and  621 B,  622 A and  622 B,  623 A and  623 B,  624 A and  624 B,  625 A and  625 B,  626 A and  626 B, respectively. Two adjacent refraction regions respectively have a refraction direction opposite to each other. For example, the refraction region formed by layers  621 A and  621 B causes the light exiting the refraction plate  62  to deflect toward the right side (R) of a viewer, but the adjacent refraction region formed by layers  622 A and  622 B causes the light exiting the refraction plate  62  to deflect toward the left side (L) of a viewer. 
         [0045]    As shown in step  904  of  FIG. 9  and in  FIG. 10 , the refraction regions formed by layers  621 A and  62   1 B,  623 A and  623 B, and  625 A and  625 B in the refraction plate  62  respectively correspond to the pixels  1002 ,  1004 , and  1006  in the display device  1001  displaying the image data deflecting toward the right side (R), and the refraction regions formed by layers  622 A and  622 B,  624 A and  624 B, and  626 A and  626 B in the refraction plate  62  respectively correspond to the pixels  1003 ,  1005 , and  1007  in the display device  1001  displaying the image data deflecting toward the left side (L). As such, a viewer may observe the stereoscopic image when viewing the alternately displayed image through the refraction plate  62 . 
         [0046]    Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.