Abstract:
A digital camera which converts a picked-up optical image of an object into digital image data comprises a memory card slot part and a disk drive part. Digital image data can be transferred between a memory attached to the memory card slot part and a small disk inserted into the disk drive part.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS  
         [0001]    This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2001-130080, filed Apr. 26, 2001, the entire contents of which are incorporated herein by reference.  
         BACKGROUND OF THE INVENTION  
         [0002]    1. Field of the Invention  
           [0003]    The present invention relates to a digital camera and a control method thereof in which a still image or a motion picture of a picked-up object is converted into digital image data and recorded on a portable recording medium attached to a main body.  
           [0004]    2. Description of the Related Art  
           [0005]    As is well known, a conventional digital camera as described above is constructed such that a memory card including, for example, a semiconductor memory and the like is attached to a memory card slot part provided in the main body of the camera to record digital image data.  
           [0006]    Meanwhile, in recent years, for example, developments have been made in the technique of recording/reproducing digital data on/from a small disk having a diameter of about 1 inch, which has a portability substantially equivalent to a memory card, by means of magnetism, light, magneto-optics, or the like.  
           [0007]    Therefore, in a digital camera, a disk drive part for driving a small disk is mounted on its main body, so that digital image data can be recorded on a small disk.  
           [0008]    However, the digital camera as described above is still being developed. It has been strongly required that improvements should be made in various areas so as to comply sufficiently with the needs of users.  
           [0009]    Two types of digital cameras are known. The first type uses a memory card as portable recording medium. The second type uses a small disk as portable recording medium.  
           [0010]    Data cannot be transferred from the camera of the first type, directly to the camera of the second type. Nor can data be transferred to the camera of the second type, directly to the camera of the first type.  
           [0011]    Therefore, in the case of performing a simple edit operation or the like for transferring digital image data between a memory card and a small disk, it is necessary to use an optional editing system using a PC (Personal Computer).  
           [0012]    That is, by using this editing system, it is possible to carry out the operation of reading the necessary data from one recording medium, storing it, and writing the stored data into another recording medium.  
           [0013]    However, if even simple editing cannot be carried out unless an optional editing system is used, it will be inconvenient for a user. A problem hence arises in that the camera is not suitable for practical use.  
           [0014]    Note that known techniques concerning an electronic camera for recording image data obtained by picking up an image onto a recording medium are disclosed in, for example, Japanese Patent Application KOKAI Publication No. 5-91452 and Japanese Patent Application KOKAI Publication No. 10-233989.  
           [0015]    However, the former reference discloses a technique in which image data obtained by picking up an image is stored into either an internal memory or an external memory in accordance with a selection made by a memory selection switch.  
           [0016]    Meanwhile, the latter reference discloses a technique in which still image data and moving picture data are respectively stored in dedicated memories. Thus, neither of the references includes a description concerning countermeasures against problems as described above.  
         BRIEF SUMMARY OF THE INVENTION  
         [0017]    The present invention has been made in consideration of the above situation and has an object of providing a digital camera and a method of controlling the same, in which both different types of portable recording media can be attached and data can be transferred between the portable recording media, so that simple editing can be realized and handling for users is convenient and suitable for practical use.  
           [0018]    A digital camera according to the present invention converts a picked-up optical image of an object into digital image data. The camera comprises first and second attachments to which first and second recording media of types different from each other can be attached, and a controller recording/reproducing the digital image data onto/from the first and second recording media attached to the first and second attachments.  
           [0019]    A method according to the present invention is to control a digital camera which converts an image of an object into digital data. The method comprises an attachment step of attaching first and second attachments to which first and second recording media of types different from each other can be attached, and a control step of recording/reproducing the digital image data onto/from the first and second recording media attached to the first and second attachments in the attach.  
           [0020]    According to the structure and method as described above, digital image data is recorded/reproduced onto/from the first and second recording media attached respectively to the first and second attachments. Therefore, simple editing can easily be realized without using optional editing systems or so like the prior art, so handling for users is convenient and suitable for practical use.  
           [0021]    Additional objects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objects and advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out hereinafter. 
       
    
    
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING  
       [0022]    The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention, and together with the general description given above and the detailed description of the embodiments given below, serve to explain the principles of the invention.  
         [0023]    [0023]FIG. 1 is a front view showing an embodiment of the present invention and illustrates an outer appearance of a digital still camera;  
         [0024]    [0024]FIG. 2 is a block configuration diagram showing a signal processing system of a digital still camera in the embodiment;  
         [0025]    [0025]FIG. 3 is a flowchart for explaining an editing operation for moving digital image data in the embodiment;  
         [0026]    [0026]FIG. 4 is a flowchart for explaining an editing operation for moving digital image data in the embodiment; and  
         [0027]    [0027]FIG. 5 is a front view showing an outer appearance of a digital still camera to explain a modification example of the embodiment. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0028]    In the following, an embodiment of the present invention will be explained with reference to the drawings. FIG. 1 shows an outer appearance of a digital still camera  11 , viewed from the front side of the camera.  
         [0029]    Specifically, an image pick-up lens  12 , a finder  13 , a release switch  14 , a strobe  15 , and the like are provided respectively at predetermined positions in the digital still camera  11 .  
         [0030]    Also, a memory card slot  16  is provided at a side surface thereof in the digital still camera  11 . A memory card  17  is inserted into the memory card slot  16 .  
         [0031]    In this memory card  17 , for example, a memory  17   a  constructed by a semiconductor memory chip made in the form of an IC (Integrated Circuit), a ferroelectric memory chip, or the like are contained in a card-like case  17   b.    
         [0032]    Further, this digital still camera  11  is capable of recording/reproducing digital image data obtained by picking up an image, onto/from the memory  17   a  of the memory card  17  inserted into the memory card slot  16 .  
         [0033]    Further, a disk drive part  18  is provided at the other side surface of this digital still camera  11 . A disk cartridge  19  having a size substantially equal to the memory card  17  is attached to the disk drive part  18 .  
         [0034]    In the disk cartridge  19 , a small disk  19   a  capable of recording/reproducing digital data by magnetism, light, or magneto-optics is contained in a casing  19   b.    
         [0035]    Further, the digital still camera  11  is capable of recording/reproducing digital image data obtained by picking up an image onto/from the small disk  19   a  in the disk cartridge  19 .  
         [0036]    Also, the digital still camera  11  is capable of performing control for reading digital image data from the memory  17   a  and writing it into the small disk  19 , control for reading digital image data from the small disk  19   a  and writing it into the memory  17   a , or the like.  
         [0037]    [0037]FIG. 2 shows a signal processing system in the digital still camera  11 . That is, an optical image of an object which is inserted through the image pickup lens  12  is focused on a CCD (Charge Coupled Device)  20  and is photoelectrically converted.  
         [0038]    Further, the analogue image signal outputted from the CCD  20  is supplied to the A/D (Analogue/Digital) convertor  21  and converted into digital data. The digital image data is thereafter supplied to a CCD signal processing circuit  22 .  
         [0039]    This CCD signal processing circuit  22  performs predetermined signal processing on inputted digital image data, thereby to convert the digital image data into a luminance signal component and a chrominance signal component.  
         [0040]    Further, digital image data including the luminance signal and chrominance signal obtained by the CCD signal processing circuit  22  is written into a work memory  24  through a memory controller  23 .  
         [0041]    The digital image data recorded in the work memory  24  is read out onto an image display processing circuit  25  through the memory controller  23 , and predetermined processing for displaying an image is performed thereon, so that the data is converted into an analogue image signal.  
         [0042]    Thereafter, the analogue image signal outputted from the image display processing circuit  25  is supplied to an image display device  26  externally attached to the digital still camera  11  and displayed as an image.  
         [0043]    Also, the digital image data outputted from the CCD signal processing circuit  22  may be guided to an image compression/expansion processing circuit  27  through the memory controller  23  and may be subjected to predetermined compression processing.  
         [0044]    Further, the digital image data subjected to compression processing by the image compression/expansion processing circuit  27  can be written into the work memory  24 .  
         [0045]    In this case, the digital image data recorded on the work memory  24  is fed to the image compression/expansion processing circuit  27 , and predetermined expansion processing is performed, so that the data is converted into original digital image data.  
         [0046]    The digital image data thus subjected to expansion processing by the image compression/expansion processing circuit  27  may be guided to the image display device  26  and may be displayed as an image through the image display processing circuit  25 .  
         [0047]    A series of processing operations as described above are unitarily controlled by a CPU (Central Processing Unit)  29  which operates in response to operation information from an operating part  28  including the release switch  14 .  
         [0048]    The operation of recording/reproducing digital image data onto/from the memory  17   a  of the memory card  17  and the small disk  19   a  of the disk cartridge  19  is also unitarily controlled by the CPU  29 .  
         [0049]    That is, the digital image data output from the CCD signal processing circuit  22  is supplied via the memory controller  23  to the image compression/expansion processing circuit  27 . The circuit  27  compresses the digital image data.  
         [0050]    The digital image data thus subjected to compression processing is once recorded into the work memory  24  through the memory controller  23 . Thereafter, the digital image data read out from the work memory  24  is guided to the memory card slot  16  through the memory controller  23  and the CPU  29  and is recorded into the memory  17   a  of the memory card  17 .  
         [0051]    The digital image data recorded in the memory  17   a  of the memory card  17  is read out from the memory card slot part  16  by the memory card slot part  16  and is once recorded into the work memory  24  after passing through the CPU  29  and the memory controller  23 .  
         [0052]    Thereafter, the digital image data read out from the work memory  24  is introduced to the image compression/expansion circuit  27  and subjected to expansion processing, so that the data is converted back into original digital image data.  
         [0053]    Further, the digital image data on which expansion processing is performed by the image compression/expansion processing circuit  27  is fed to the image display device  26  through the memory controller  23  and the image display processing circuit  25 , and is displayed as an image.  
         [0054]    Also, the digital image data, which has been outputted from the CCD signal processing circuit  22  and subjected to compression processing by the image compression/expansion processing circuit  27  through the memory controller  23 , is once recorded into the work memory  24  through the memory controller  23 .  
         [0055]    Thereafter, the digital image data read out from the work memory  24  is fed to the disk drive part  18  through the main controller  23  and the CPU  29 , and is recorded onto the small disk  19   a  of the disk cartridge  19 .  
         [0056]    The digital image data recorded on the small disk  19   a  of the disk cartridge  19  is read out by the disk drive part  18  and is once recorded into the work memory  24 , after passing through the CPU  29  and the memory controller  23 .  
         [0057]    Thereafter, the digital image data read out from the work memory  24  is guided to the image compression/expansion processing circuit  27 , and expansion processing is performed thereon, so the data is converted back into the original digital image data.  
         [0058]    Further, the digital image data on which expansion processing is performed by the image compression/expansion processing circuit  27  is guided to the image display device  26  through the memory controller  23  and the image display processing circuit  25 , to display an image.  
         [0059]    Next, FIG. 3 shows a flowchart showing an example of editing operation for moving digital image data recorded on one of two types of recording media, which are the memory  17   a  and the small disk  19   a , to the other one of the recording media.  
         [0060]    From the flowchart shown in FIG. 3, compression processing and expansion processing which are performed on digital image data are omitted to simplify the understanding of its main operation.  
         [0061]    Firstly, upon starting the operation (step S 11 ), the CPU  29  collects image files (information) corresponding to all of the digital image data recorded on the recording medium as a move source from which data is to be moved in the step S 12 .  
         [0062]    Further, in the step S 13 , the CPU  29  reads one image file among all image files (information) collected from the recording medium as the move source, and records it into the work memory  24 .  
         [0063]    Thereafter, in the step S 14 , the CPU  29  determines whether or not the space necessary for writing data to be recorded exists in the recording medium as a move destination. If it is determined that no space exists (NO), the operation ends as it is (step S 18 ).  
         [0064]    Otherwise, if it is determined in the step S 14  that space exists in the recording medium as the move destination (YES), the CPU  29  performs control so as to read the image file recorded in the work memory  24  and to write it onto the recording medium as the move destination in the step S 15 .  
         [0065]    Thereafter, in the step S 16 , the CPU  29  erases the image file which has been completely recorded onto the recording medium as the move destination. In the step S 17 , the CPU  29  determines whether or not an image file remains on the recording medium as the move source.  
         [0066]    If it is determined that an image file remains (YES), the CPU  29  returns to the processing of the step S 13 . If it is determined that no image file remains (NO), the processing is directly ended (in the step S 18 ).  
         [0067]    According to the structure and operation example as described above, both of the memory card  16  and the disk cartridge  19  can be attached to the digital still camera  11 . It is therefore possible to realize automatically the editing operation of moving all image files recorded on one of the recording media to the other. Handling is thus convenient for users and is suitable for practical use.  
         [0068]    Next, FIG. 4 shows a flowchart showing an example of explaining an editing operation for copying image data recorded on one of two types of recording media, i.e., the memory  17   a  and the small disk  19   a , to the other one of the recording media.  
         [0069]    From the flowchart shown in FIG. 4, compression processing and expansion processing made on digital image data are also omitted to simplify the understanding of its main operation.  
         [0070]    At first, upon starting (step S 19 ), the CPU  29  collects image files (information) corresponding to all of the digital image data in the step S 20 .  
         [0071]    Also, in the step S 21 , the CPU  29  reads a copy history (information) from the recording medium as a copy source and records it into the work memory  24 . This copy history file is information indicating presence or absence of a past copy operation with respect to each image file recorded on the recording medium if the copy source has been copied in the past.  
         [0072]    Further, in the step S 22 , the CPU  29  grasps the copy status of each image file recorded on the recording medium as the copy source, based on the copy history file recorded in the work memory  24 .  
         [0073]    Thereafter, in the step S 23 , the CPU  29  determines whether or not copying has been completed with respect to an image file recorded on the recording medium as the copy source. If it is determined that copying has not been completed yet (NO), the CPU  29  reads the one image file from the recording medium as the copy source and records it into the work memory  24  in the step S 24 .  
         [0074]    In the step S 25 , the CPU  29  determines whether or not space necessary for writing data to be recorded exists in the recording medium as the copy destination to which data is copied.  
         [0075]    If it is determined that space exists on the recording medium as the copy destination (YES), the CPU  29  makes control so as to read the image file recorded in the work memory  24 , and write it into the recording medium as the copy destination, in the step S 26 .  
         [0076]    Thereafter, in the step S 27 , the CPU  29  adds information indicating that the image file has been copied, to the copy history file recorded in the work memory  24 . That is, the CPU  29  updates the copy history file in the work memory  24 .  
         [0077]    Further, after the step S 27  or if it is determined in the step S 23  that the one image file recorded on the recording medium as the copy source has been copied (YES), the CPU  29  determines whether an image file which has not yet been copied remains in the recording medium as the copy source, in the step S 28 . If it is determined that an image file remains (YES), the processing is returned to the step S 22 .  
         [0078]    If it is determined in the step S 28  that an image file which has not yet been copied does not remain any more in the recording medium as the copy source (NO), or if it is determined in the step S 25  that the necessary space does not exist in the recording medium as the copy destination (NO), the CPU  29  writes the copy history file of the work memory  24  onto the recording medium as the copy source, in the step S 29 , and then, ends the processing (step S 30 ).  
         [0079]    According to the operation example as described above, it is possible to realize automatically the editing operation of selecting an image file which has not been copied in the past from image files recorded on one of the recording media and of copying it into the other one of the recording media. Handling is thus convenient for users and is suitable for practical use.  
         [0080]    Next, FIG. 5 shows a modification example of the embodiment described above. An explanation will now be made with the same parts as those of FIG. 1 denoted by the same reference symbols. A separate display drive part  30  is provided for a digital still camera  11 .  
         [0081]    Specifically, the disk drive part  30  is provided to be detachable/attachable from/to the digital still camera  11 . Its size is arranged such that portability of the digital still camera  11  might not be hindered even in a state where the drive part is attached to the camera.  
         [0082]    Further, the disk cartridge  19  as described previously can be attached to the disk drive part  30 , and digital image data obtained by picking up an image by the digital still camera  11  can be recorded/reproduced onto/from the small disk  19   a  of the disk cartridge  19 .  
         [0083]    Even in this structure in which the digital still camera  11  and the disk drive part  30  are constructed separately from each other, it is possible to perform control for reading digital image data from the memory  17   a  and writing it onto the small disk  19   a , and conversely, control for reading digital image data from the small disk  19   a  and writing it into the memory  17   a , on the contrary, and the like. The edit operations as shown in FIGS. 3 and 4 can thus be realized.  
         [0084]    Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.