Abstract:
An imaging apparatus fetches an optical image of an object so as to produce an image signal, records on a recording medium an image signal corresponding to a still-image-use image size according to a still-image recording instruction, records on the recording medium an image signal corresponding to a moving-image-use image size according to a moving-image recording instruction, repeatedly creates the image signal and causes a displayer to display a still-image-use through image corresponding to the still-image-use image size, repeatedly creates the image signal and causes the displayer to display a moving-image-use through image corresponding to the moving-image-use image size, switches the still-image-use through image and the moving-image-use through image, and accepts the still-image recording instruction or the moving-image recording instruction when the still-image-use through image or the moving-image-use through image is displayed.

Description:
CROSS REFERENCE OF RELATED APPLICATION 
     The disclosure of Japanese Patent Application No. 2008-145199, which was filed on Jun. 2, 2008 is incorporated herein by reference. 
     BACKGROUND OF THE INVASION 
     1. Field of the Invention 
     The present invention relates to an imaging apparatus. In particular, the present invention relates to an imaging apparatus, having a recording function of recording a still image and a moving image, for displaying a through image on a display device, for example, the imaging apparatus being for controlling display onto the display device on the through image of an imaging area according to image sizes of a still image and a moving image set by a user. 
     2. Description of the Related Art 
     In the recent years, there is commercialized a video camera having a function capable of not only imaging and recording a still image but also imaging and recording a moving image over a long period of time. It is possible not only to reproduce and display the shot moving image on a monitor provided in the video camera but also to reproduce and display that image by a television receiver of a fixed-pixel system such as a liquid crystal display or of a cathode ray tube system or the like, which is connected to the video camera Then, in the recent years, a television receiver capable of displaying a high-vision image (HD: High Definition) is widely used, and in response thereto, there is commercialized a video camera capable of imaging and recording not only an SD (Standard Definition) image, which is called a standard image quality, but also the high-vision image. 
     To change a subject slightly, an aspect ratio of the high-vision image generally is 16:9 while that of the SD image is 4:3. Therefore, a video camera having a function as an electronic view finder for displaying on a monitor images (through images) which are for confirming an object image to be imaged and which are sequentially outputted from an imaging element (in this way, it becomes necessary to take a look over a finder during imaging) includes many products so designed that both an image having the aspect ratio of 16:9 and that having the aspect ratio of 4:3 are displayable. 
     Moreover; in the conventional video camera, through images to be displayed on a monitor while waiting for imaging may include a moving image having an aspect ratio of 16:9 and a still image having an aspect ratio of 4:3. In this case, imaging modes are switched by a power supply switch, a mode change-over switch, etc., to switch between the through image having the aspect ratio of 16:9 and that having the aspect-ratio of 4:3. However such a mode change-over process requires complicated operations by the user, and thus, it takes a long period of time. 
     In a certain conventional imaging apparatus, in order to alleviate the complicated operations by the user or to immediately determine a recording image region according to switching of the images photographed by the user, a guide frame is added according to whether image data to be recorded is the moving image or the still image, or according to a recording state, i.e., whether a parallel image recording (both the moving image and the still image) is performed, and the guide frame is dynamically switched and displayed. 
     However, in the above-described imaging apparatus, as a through image, a still-image-compatible guide frame and a moving-image-compatible guide frame are merely displayed in a photographing-image displaying region. Even when a user wishes to shoot the still image, the through image displayed on the monitor is not a still-image-use through image in an imaging area corresponding to an image size that is actually recorded. Likewise, even when the user wishes to shoot the moving image, the through image displayed on the monitor is not a moving-image-use through image in an imaging area corresponding to an image size that is actually recorded. 
     That is, in the above-described imaging apparatus, even when the user refers to the through image that is displayed on the monitor and that waits for imaging so as to perform still-image shooting or moving-image shooting, the still-image-use guide frame and the moving-image-use guide frame are displayed all the time. Thus, the user is not able to intuitively recognize the imaging area to be imaged, and is not necessarily able to see a through image that is said to be easy to see. 
     SUMMARY OF THE INVENTION 
     An imaging apparatus according to the present invention, comprises: an imager for fetching an optical image of an object so as to produce an image signal; a still-image recorder for recording on a recording medium an imaging signal corresponding to a still-image-use image size according to a still-image recording instruction; a moving-image recorder for recording on the recording medium an imaging signal corresponding to a moving-image-use image size according to a moving-image recording instruction; a still-image-use through image displayer so configured that the imaging signal is repeatedly created by the imager and a still-image-use through image corresponding to the still-image-use image size is displayed on a displayer; a moving-image-use through image displayer so configured that the imaging signal is repeatedly created by the imager and a moving-image-use through image corresponding to the moving-image-use image size is displayed on the displayer; a through image switcher for switching the still-image-use through image and the moving-image-use through image; and an acceptor for accepting the still-image recording instruction or the moving-image recording instruction when the still-image-use through image or the moving-image-use through image is displayed. 
     Preferably, further comprised is a superposer for superposing a framework indicating the moving-image-use image size on the still-image-use through image when the still-image-use through image is displayed on displayer in still-image-use through image displayer. 
     More preferably further comprised are: a still-image aspect-ratio setter for setting an aspect ratio of the still image; and a moving-image aspect-ratio setter for setting an aspect ratio of the moving image, wherein superposer superposes a framework based on the still-image aspect ratio and the moving-image aspect ratio onto the still-image-use through image. 
     The above described features and advantages of the present invention will become more apparent from the following detailed description of the embodiment when taken in conjunction with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an outline view showing a configuration of an electronic camera that is one embodiment of the present invention; 
         FIG. 2  is an outline view showing another appearance of the electronic camera that is one embodiment of the present invention; 
         FIG. 3  is a block diagram showing the configuration of the electronic camera that is one embodiment of the present invention; 
         FIG. 4  is an illustrative view showing a configuration of an imaging element of the electronic camera that is one embodiment of the present invention; 
         FIG. 5  is an illustrative view showing one portion of transition of a through image displayed on an LCD monitor of the electronic camera that is one embodiment of the present invention; 
         FIG. 6  is an illustrative view showing another portion of transition of the through image displayed on the LCD monitor of the electronic camera that is one embodiment of the present invention; 
         FIG. 7  is an illustrative view showing still another portion of transition of the through image displayed on the LCD monitor of the electronic camera that is one embodiment of the present invention; 
         FIG. 8  is a flowchart showing one portion of an operation of the electronic camera that is one embodiment of the present invention; 
         FIG. 9  is a flowchart showing another portion of the operation of the electronic camera that is one embodiment of the present invention; and 
         FIG. 10  is a flowchart showing another portion of the operation of the electronic camera that is one embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     In this embodiment, as one example of an imaging apparatus, a mode of an electronic camera  10  is described. 
     An outline view of the electronic camera  10  is shown in  FIG. 1  and  FIG. 2 .  FIG. 1  is a perspective view showing a front surface of the electronic camera  10 , and  FIG. 2  is a perspective view showing a rear surface of the electronic camera  10 . 
     As shown in  FIG. 1  and  FIG. 2 , the electronic camera  10  is provided with: an imaging portion  12  including at least a lens portion  2 ; a finder portion  4  including an LCD monitor  4   a ; a hinge potion  6 ; and operation buttons  8   a  to  8   f.    
       FIG. 1  is a diagram showing a state in which the finder portion  4  is housed in an apparatus main body having the imaging portion  12  so that the LCD monitor  4   a  is not exposed. Normally, a user does not perform a shooting operation with this form.  FIG. 2  shows a rear surface of  FIG. 1 , and shows a state in which the finder portion  4  is turned via the 2-shaft hinge portion  6  and the LCD monitor  4   a  is positioned substantially vertically to the apparatus main body. 
     The LCD monitor  4   a  displays a reproduced image and a through image, and also functions as an electronic finder as a result of the through image being displayed while waiting for shooting. The operation buttons  8   a  to  8   f  configuring the operating portion  8  are described in detail below. Numeral  8   a  is an image/reproduce change-over switch for switching an operating mode to one of an imaging mode and a reproducing mode. When the image/reproduce change-over switch  8   a  is moved to an X position (top position), a current mode is set to the imaging mode, and when it is moved to a Y position (bottom position), the current mode is set to the reproducing mode. Numeral  8   b  is a moving-image shooting start/end button for staring/ending, when being depressed, a moving-image shooting process of the imaging portion  12 , and numeral  8   c  is a still-image shooting button for instructing a still-image shooting process. Numeral  8   d  is a menu button, and when it is depressed, a selectable menu setting item, etc., are displayed on the LCD monitor  4   a . Numeral  8   e  is a cursor key so configured that it is in a state of being inclined in one of directions when being manually operated in four directions (up, down, right, and left directions) and it is returned back to the original neutral position from the inclined state when being canceled from the manual operation. When operated in one of the four directions, it becomes possible to select and instruct the item, etc., displayed within the LCD monitor  4   a . A center portion of the four directions of the cursor key  4   e  serves also as a set key, and as a result of being depressed when at a neutral position of the four directions, a setting operation is performed, the item, etc., are determined, and the item selected and determined is set. Also, numeral  8   f  is a switching button for switching a display image size of the through image displayed on the LCD monitor  4   a . When the switching button  8   f  is depressed, a switching process of through images, which is described later, is performed. 
     Subsequently, by using  FIG. 3  which is a block diagram of the interior of the electronic camera  10  shown in  FIG. 1  and  FIG. 2 , the operation of the electronic camera  10  is described in more detail. 
     The electronic camera  10  is configured to include: the lens portion  2 ; the LCD monitor  4   a ; the operating portion  8 , an aperture mechanism  14 ; a CMOS imager unit  16  including a CMOS imager  16   a,  a timing generator (TG)  16   b,  and an AFE portion  16   c ; a signal processing portion  18 ; an SDRAM  20 ; a CPU  22  including a timer T 22   a ; an image compression/decompression processing portion  24 ; a card controlling portion  26 ; an external memory card  28 ; a motor driving portion  30 ; and an internal memory  32 . 
     The lens portion  2  focuses an optical image of an object onto an imaging surface of the CMOS imager  16   a,  which is an imaging element. Also, the lens portion  2  is adjusted in movement in an optical axis direction based on an output signal of the CMOS imager  16   a . When the aperture mechanism  14  is controlled, light entering from the lens portion  2  to the CMOS imager  16   a  is adjusted. The lens portion  2  and the aperture mechanism  14  are adjusted by the motor driving portion  30 . 
       FIG. 4  is a diagram showing a light-receiving surface of the CMOS imager  16   a . To the CMOS imager  16   a,  a primary color filter (Bayer arrangement) is attached, and on the light-receiving surface, an effective area and an optical black area (OB area) are formed. More specifically, the effective area is formed at a center of the light-receiving surface, and the OB area is formed at a periphery of the light-receiving surface. 
     The CMOS imager  16   a  has an amplifier for each pixel and reads out an analog video signal for each pixel. The optical image of the object is focused on the light-receiving surface of the CMOS imager  16   a,  and is outputted as an analog imaging signal according to a transfer signal which is produced by the TG  16   b  and is required for driving the CMOS imager  16   a . The TG  16   b  uses a predetermined image area instructed by the CPU  22  as an effective pixel, and outputs the effective pixel as the analog imaging signal from the CMOS imager  16   a.    
     In this embodiment, as shown in  FIG. 4 , as the image area, image areas a to d exist within the effective area. This is described by using  FIG. 4 ; the image area a corresponds to a rectangular dimension surrounded by solid lines, and the image area b corresponds to a dimension surrounded by solid lines within the image area a. The image area c corresponds to a dimension that is obtained by adding the image area a and a dimension surrounded by chained lines shown, from points at which a bottom side of the image area a and lateral sides thereof intersect, in a vertical direction relative to the bottom side of the image area a and in parallel to the bottom side thereof. Moreover, the image area d corresponds to a dimension surrounded by chained lines shown, from points at which a bottom side of the image area b and lateral sides thereof intersect, in a vertical direction relative to the bottom side and in parallel to the bottom side of the image area b. 
     The image areas a to d are selected based on the set image size on the menu setting used by the user. The image area a in this embodiment corresponds to an image size, having an aspect ratio of 16:9, for still-image shooting; the image area b corresponds to an image size, having an aspect ratio of 16:9, for moving-image shooting; the image area c corresponds to an image size, having an aspect ratio of 4:3, for still-image shooting; and the image area d corresponds to an image size, having an aspect ratio of 4:3, for moving-image shooting. Further, as compared to the dimensions of the image areas a and c for still-image shooting, those of the image areas b and d are set smaller so that an electronic image-stabilizing process can be performed during a moving-image shooting. 
     Further, the electronic camera  10  of this embodiment is able to select a frame rate in the moving-image shooting. As the frame rate, it is possible to select the frame rate from 60 field/second, 60 frame/second, 30 frame/second, and 300 frame/second, for example. When 300 frame/second is selected, pixels are thinned out from the image area c having an aspect ratio of 4:3, and the analog video signal is read out. Hereinafter, the description is provided as follows: normal moving-image shooting in this embodiment is defined as moving-image shooting having a frame rate of 60 frame/second while high-speed moving-image shooting is defined as moving-image shooting having a frame rate of 300 frame/second. 
     The analog imaging signal outputted from the CMOS imager  16   a  based on a predetermined image area is inputted in the AFE (Analog Front End) portion  16   c,  subjected to a correlated double sampling process, a gain adjustment, a clamping process, and a digital-signal converting process, and then, outputted to the signal processing portion  18 . In the signal processing portion  18 , Y, U, and V signals produced as a result of various signal processes being executed are temporarily accommodated in the SDRAM  20  as the digital image signal. By control of the CPU  22 , when a still-image shooting operation is performed, the digital image signal accommodated in the SDRAM  20  is subjected to a compressing process of a JPEG standard in the image compression/decompression processing portion  24 , and when a moving-image shooting operation is performed, subjected to a compressing process of an MPEGH 264 standard. As a result, the accommodated digital image signal is converted into compressed image data. Then, as a result of being controlled from the CPU  22 , the card controlling portion  26  controls the external memory card  28  so as to record the compressed image data. 
     Further, at a shooting waiting time, the frame rate is set to 30 frame/second. In this state, the above-described similar signal processes and a thinning-out process by control of the CPU  22  are performed on the analog imaging signal outputted from the CMOS imager  16   a  based on a predetermined image area, the resultant signal is outputted as the digital image signal on the LCD monitor  4   a,  and displayed on the LCD monitor  4   a  as a through image having a frame rate of 30 frame/second. 
     The operating portion  8  includes the moving-image shooting start/end button  8   b  and the still-image shooting button  8   c,  as described above. By operating the operating portion  8 , the user is able to set a desired image size and normal moving-image shooting/high-speed moving-image shooting. More specifically, when the menu button  8   d  is depressed, a menu display is appeared on the LCD monitor  4   a . The user operates the cursor key  8   e  in the four directions in order to set to the desired image size, and when the center portion of the cursor key  8   e  is depressed to determine the setting, setting of the image size and the normal moving-image shooting/high-speed. moving-image shooting is performed. Setting contents of the image size and the normal moving-image shooting/high-speed moving-image shooting set in this setting operation are stored in the internal memory  32 . 
     Further, in the internal memory  32 , a flag S is accommodated, and according to the flag S, the CPU  22  determines a mode of the through image to be displayed on the LCD monitor  4   a  while waiting for shooting. When the flag S is 1, the CPU  22  displays a moving-image-use through image, as the through image displayed on the LCD monitor  4   a,  and when the flag S is 0, the CPU 22  displays a still-image-use through image, as the through image displayed on the LCD monitor  4   a.    
     It is noted that the image size when the setting of the high-speed moving-image shooting is performed is fixed in the image area c having an aspect ratio of 4:3 of the CMOS imager  16   a,  as described above. Examples of the normal moving-image shooting and the high-speed moving-image shooting are provided, below. In a case where a start of the moving-image shooting operation is executed by depressing the moving-image shooting start/end button  8   b,  if the aspect ratio of the image size for moving-image shooting, which is set by the user, is 16:9 and the current imaging is the normal moving-image shooting, the analog imaging signal corresponding to the image area b of the CMOS imager  16   a  is outputted at a frame rate of 60 frame/second. Then, the outputted analog imaging signal is subjected to the above-described processes, and the compressed image data corresponding to the image area b is recorded on the external memory card  28 . Further when the aspect ratio of the image size for moving-image shooting, which is set by the user, is 4:3, the compressed image data corresponding to the image area d is recorded. Then, when the moving-image shooting start/end button  8   b  is depressed again, an end of the moving-image shooting operation is executed. In this manner the moving-image shooting is ended. 
     Further, in a case where a start of the moving-image shooting operation is executed by depressing the moving-image shooting start/end button  8   b,  if the high-speed moving-image shooting has been set by the user, the analog imaging signal thinned out from the image area c of the CMOS imager  16   a  is outputted at a frame rate of 300 frame/second. During this high-speed moving-image shooting, even when the moving-image shooting start/end button  8   b  is depressed again, the moving-image shooting is not ended. Rather than that, for a predetermined time period, 10 seconds, for example, processes such as the imaging process, signal process, and recording process are continued. Normally, the imaging process, the signal process, the recording process, etc., are controlled by the CPU  22 , and thus, a speed of a process required until the analog imaging signal outputted from the CMOS imager  16   a  is recorded on the external memory card  28  depends on a processing performance of the CPU  22 . Therefore, in this embodiment, in consideration of the processing performance of the CPU  22 , imaging and recording times of the high-speed moving-image shooting are previously set. Moreover, in this embodiment, other tan depressing of the moving-image shooting start/end button  8   b,  any operation such as depressing of the menu button, operating of a zoom button not shown, and a power-OFF operation of the electronic camera  10  is unacceptable. 
     Subsequently, an example of the still-image shooting is provided. In a case where the still-image shooting operation is executed by depressing the still-image shooting button  8   c,  if the aspect ratio of the image size for still-image shooting, which is set by the user, is 16:9, the compressed image data corresponding to the image area a is recorded, and if the aspect ratio is 4:3, the compressed image data corresponding to the image area c is recorded. 
     Subsequently, the through image displayed on the LCD monitor  4   a  while waiting for shooting in this embodiment is described. For example, it is assumed that the user selects an image size, having an aspect ratio of 16:9, for still-image shooting and an image size, having an aspect ratio of 16:9, for moving-image shooting. At this time, as a through image outputted on the LCD monitor  4   a,  the moving-image-use through image corresponding to the image size for moving-image shooting is displayed. In this embodiment, as the through image, the moving-image-use through image, and the still-image-use through image, described next, are displayed on the LCD monitor  4   a . As an initial setting, however, the moving-image-use through image is displayed on the LCD monitor  4   a  as the through image. To be described in more detail, the moving-image-use through image is an image obtained by performing a thinning-out process intended to display on the LCD monitor  4   a  based on the analog imaging signal outputted from pixels corresponding to the image area b. 
     Herein, in a case where the user depresses the moving-image shooting start/end button  8   b  so as to execute the moving-image shooting, if the user sees the moving-image-use through image displayed on the LCD monitor  4   a,  the user is able to intuitively understand that the imaging is performed in the image area to be imaged. However, even when the moving-image-use through image is being displayed, if the user half-depresses the still-image shooting button  8   c,  the still-image-use through image based on the analog imaging signal corresponding to the image area a is displayed on the LCD monitor  4   a . Further, when the user fully depresses the still-image shooting button  8   c  to perform the still-image shooting operation, the compressed image data based on the analog imaging signal corresponding to the image area a is recorded on the external memory card  28 . 
     In this case, while waiting for shooting that lasts until the user half-depresses the still-image button  8   c,  the user ends up with monitoring the moving-image-use through image displayed on the LCD monitor  4   a,  and thus, it is difficult to envision the still image actually recorded on the external memory card  28 . 
     Therefore, in this embodiment, it is so configured that when the switching button  8   f  is depressed, the through image, while waiting for shooting, displayed on the LCD monitor  4   a  is switched from the moving-image-use through image to the still-image-use through image, or from the still-image-use through image to the moving-image-use through image. Therefore, while the user waits for imaging, it is possible to easily and quickly display the through image desired by the user on the LCD monitor  4   a.    
     Subsequently, a specific operating example is described. When the user wishes to primarily perform the still-image shooting, if the switching button  8   f  is operated, the still-image-use through image is displayed, and when the user wishes to primarily perform the moving-image shooting, if the switching button  8   f  is operated, the moving-image-use through image is displayed. Thus, it is possible to display the through image desired by the user on the LCD monitor  4   a  with a simple operation, and convenience for the user is improved. 
       FIG. 5  to  FIG. 7  are diagrams showing a display transition of the still-image-use through image and the moving-image-use through image displayed on the LCD monitor  4   a  as a result of the switching button  8   f  being operated, and an image displayed on the LCD monitor  4   a  when the still-image shooting or the moving-image shooting is performed. 
       FIG. 5(   a ) shows a screen on which a moving-image-use through image A, which is set to an image size having an aspect ratio of 16:9 for still-image shooting and an image size having an aspect ratio of 16:9 for moving-image shooting, is displayed on the LCD monitor  4   a . Likewise,  FIG. 5(   b ) to  FIG. 5(   d ) show screens on which moving-image-use through images B to D are displayed on the LCD monitor  4   a,  respectively. In  FIG. 5(   b ), the image size is set to an aspect ratio of 4:3 for still-image shooting and an aspect ratio of 16:9 for moving-image shooting; in  FIG. 5(   c ), the image size is set to an aspect ratio of 4:3 for still-image shooting and an aspect ratio of 4:3 for moving-image shooting; and in  FIG. 5(   d ), the image size is set to an aspect ratio of 16:9 for still-image shooting and an aspect ratio of 4:3 for still-image shooting. 
     Then, when the switching button  8   f  is depressed in a state where the moving-image-use through image A shown in  FIG. 5(   a ) is displayed, a still-image-use through image E shown in  FIG. 6(   e ) is displayed on the LCD monitor  4   a . Subsequently, within the still-image-use through image E, a framework fe (indicated by guide lines at right, left, top, and bottom) corresponding to the moving-image-use through image A is superposed. 
     Likewise, when the switching button  8   f  is depressed in a state where the  moving-image-use through image B shown in  FIG. 5(   b ) is displayed, a still-image-use through image F, shown in  FIG. 6(   f ), superposed with a framework ff corresponding to the moving-image-use through image B is displayed on the LCD monitor  4   a . Further, when the switching button  8   f  is depressed in a state where the moving-image-use through image C shown in  FIG. 5(   c ) is displayed, a still-image-use through image Q shown in  FIG. 6(   g ), superposed with a framework fg corresponding to the moving-image-use through image C is displayed on the LCD monitor  4   a . Moreover, when the switching button  8   f  is depressed in a state where the moving-image-use through image D shown in  FIG. 5(   d ) is displayed, a still-image-use through image R shown in  FIG. 6(   h ), superposed with a framework fh corresponding to the moving-image-use through image D is displayed on the LCD monitor  4   a.    
     In  FIG. 6(   h ), the guide lines of the framework superposed on the still-image-use through image H are shown at right and left only. The reason for this is that since a height of the moving image is the same as that of the still image, the still-image-use through image H is displayed on the LCD monitor  4   a  without a need of superposing the top and bottom guide lines. 
     Further, when the switching button  8   f  is depressed in a state where the moving-image-use through images E to H shown in  FIGS. 6(   e ) to  6 ( h ) are displayed, the still-image-use through images A to D shown in  FIGS. 5(   a ) to  5 ( d ) are displayed on the LCD monitor  4   a . 
       FIG. 6(   i ) shows a still-image-use through image I displayed on the LCD monitor  4   a,  which is obtained by depressing the switching button  8   f  in a state where the moving-image-use through image D of which the aspect ratio of the image size for still-image shooting shown in  FIG. 5(   d ) is 16:9 and to which the high-speed moving-image shooting mode is set is displayed. On this still-image-use through image I, a framework fi (indicated by guide lines at right and left) corresponding to the moving-image-use through image D is superposed.  FIG. 6(   j ) shows a still-image-use through image J displayed on the LCD monitor  4   a,  which is obtained by depressing the switching button  8   f  in a state where the moving-image-use through image C of which the aspect ratio of the image size for still-image shooting shown in  FIG. 5(   c ) is 4:3 and to which the high-speed moving-image shooting mode is set is displayed. The still-image-use through image J is based on the analog imaging signal outputted from the image area A, and thus, even when the switching button  8   f  is depressed, there is no change as the through image monitored by the user. 
     Then, when the moving-image shooting starting operation is performed as a result of the moving-image shooting start/end button  8 b being depressed in a state where the moving-image-use through image A or B shown in  FIG. 5(   a ) or  FIG. 5(   b ) is displayed, a moving-image shooting image K, shown in  FIG. 7(   k ), based on the image area b is displayed on the LCD monitor  4   a . Further, likewise, when the moving-image shooting starting operation is performed as a result of the moving-image shooting start/end button  8   b  being depressed in a state where the still-image-use through image E or F superposed with the framework fe or the framework if shown in  FIG. 6(   e ) or  FIG. 6(   f ) is displayed, a moving-image shooting image K (shown in  FIG. 7(   k )) from which the framework fe or ff is canceled is displayed on the LCD monitor  4   a . The moving-image shooting image K, based on the image area b, has an aspect ratio of 16:9. 
     When the moving-image shooting starting operation is performed as a result of the moving-image shooting start/end button  8   b  being depressed in a state where the moving-image-use through image C or D shown in  FIG. 5(   c ) or  FIG. 5(   d ) is displayed, a moving-image shooting image L, shown in  FIG. 7(   l ), is displayed on the LCD monitor  4   a . The moving-image shooting image L, having an aspect ratio 4:3, is based on the image area d. Further likewise, when the moving-image shooting starting operation is performed as a result of the moving-image shooting start/end button  8   b  being depressed in a state where the still-image-use through image G or H superposed with the framework fg or the framework fh shown in  FIG. 6(   g ) or  FIG. 6(   h ) is displayed, a moving-image shooting image L which is based on the image area d and from which the framework fg or fh is canceled is displayed on the LCD monitor  4   a,  as shown in  FIG. 7(   l ). 
     When the still-image shooting button  8   c  continues to be half-depressed in a state where the moving-image-use through image B or C shown in  FIG. 5(   b ) or  FIG. 5(   c ) is displayed on the LCD monitor  4   a,  a still-image-use through image M shown in  FIG. 7(   m ) is displayed on the LCD monitor  4   a . The still-image-use through image M, having an aspect ratio of 4:3, is based on the image area c. Moreover, when the still-image shooting button  8   c  is fully depressed, a still image having an aspect ratio of 4:3 and being based on the image area c is displayed on the LCD monitor  4   a  for one second, and thereafter, the moving-image-use through image B or C shown in 
       FIG. 5(   b ) or  FIG. 5(   c ) is displayed again. Further, likewise, when the still-image shooting button  8   c  continues to be half-depressed in a state where the still-image-use through image F or G shown in  FIG. 6(   f ) or  FIG. 6(   g ) is displayed on the LCD monitor  4   a,  a still-image-use through image M, based on the image area c, from which the framework ff or the framework fg is canceled is displayed on the LCD monitor  4   a,  as shown in  FIG. 7(   m ). 
     When the still-image shooting button  8   c  continues to be half-depressed in a state where the moving-image-use through image A or D shown in  FIG. 5(   a ) or  FIG. 5(   d ) is displayed on the LCD monitor  4   a,  a still-image-use through image N having an aspect ratio of 16:9 and being based on the image area a shown in  FIG. 7(   n ) is displayed on the LCD monitor  4   a . Further, when the still-image shooting button  8   c  is fully depressed, a still image having an aspect ratio of 16:9 and being based on the image area a is displayed on the LCD monitor  4   a  for one second, and the moving-image-use through image A or D shown in  FIG. 5(   a ) or  FIG. 5(   d ) is displayed again. 
     Likewise, when the still-image shooting button  8   c  continues to be half-depressed in a state where the still-image-use through image E or H shown in  FIG. 6(   e ) or  FIG. 6(   h ) is displayed on the LCD monitor  4   a,  a still-image-use through image N, based on the image area a, from which the framework fe or the framework fh is canceled is displayed on the LCD monitor  4   a,  as shown in  FIG. 7(   n ). 
     Subsequently, a process executed by the above-described CPU  22 , i.e., a process for switching the still-image-use through image display/moving-image-use through image display associated with the still-image and moving-image shooting is described in detail by using  FIG. 8  to  FIG. 10 . 
     When the electronic camera  10  is changed from a state where the LCD monitor  4   a  in  FIG. 1  is not exposed to a state where the LCD monitor  4   a  is exposed as shown in  FIG. 2 , in a step S 1 , the CPU  22  firstly detects whether the current mode is a moving-image-use through image mode (stored in the internal memory  32 ) in which the moving-image-use through image is displayed on the LCD monitor  4   a  (flag S=1) or a still-image-use through image mode in which the still-image-use through image is displayed on the LCD monitor  4   a  (flag S=0), and also reads the image size for still image/moving-image shooting. Next, the process proceeds to a step S 3 . In the step S 3 , it is determined whether the flag S detected in the step S 1  is 1 or 0. 
     When Yes is determined in the step S 1 , the process proceeds to a step S 5  to determine the image area of the CMOS imager  16   a  according to the image size for moving-image shooting detected in the step S 1 . For example, when the set image size is the image size having an aspect ratio of 4:3, the image area is determined to be the image area d. Subsequently, the process proceeds to a step S 7 . In this step, based on the analog imaging signal outputted from the image area determined in the step S 5 , the digital image signal on which the above-described processes such as a signal process are performed is outputted, as the moving-image-use through image, to the LCD monitor  4   a . Then the process proceeds to a step S 15 . 
     When NO is determined in the step S 3 , the process proceeds to a step S 9  so as to determine the image area of the CMOS imager  16   a  according to the image size for still-image shooting detected in the step S 1 . For example, when the set image size is the image size having an aspect ratio of 16:9, the image area is determined to be the image area a. Subsequently, the process proceeds to a step S 11 . In the step S 11 , the framework based on the image size for moving-image shooting detected in the step S 1  is superposed on the digital image signal on which the above-described processes such as a signal process are performed, based on the analog imaging signal outputted from the image area determined in the step S 9 . Thereafter, the process proceeds to a step S 13  so as to output the digital image signal superposed with the framework to the LCD monitor  4   a  as the still-image-use through image. Then, the process proceeds to the step S 15 . 
     In the step S 15 , whether or not the button operation in the operating portion  8  is performed is determined, and the process is waited until it is determined that the button operation is performed. Then, when YES is determined in the step S 15 , the process proceeds to a step S 16  so as to identify the button operation. Thereafter, the process proceeds to a step S 17 . In the step S 17 , it is determined whether or not the button operation identified in the step S 16  is a depressing operation of the switching button  8   f . When YES is determined in the step S 17 , the process proceeds to a step S 19  so as to set 0 when the flag S detected in the step S 1  is 1 and set to 1 when the detected flag S is 0. Thereafter the process returns to the step S 1 . 
     When NO is determined in the step S 17 , the process proceeds to a step S 21  so as to determine whether or not the button operation identified in the step S 16  is a setting operation of the image size for still-image or moving-image shooting. When YES is determined in the step S 21 , the image size based on the setting operation is stored in the internal memory  32 . Thereafter, the process returns to the step S 1 . 
     When NO is determined in the step S 21 , the process proceeds to a step S 25  so as to determine whether or not the button operation identified in the step S 16  is a half-depressing operation of the still-image shooting button  8   c . When YES is determined in the step S 25 , the process proceeds to a step S 27  so as to determine the image area of the CMOS imager  16   a . As described above, when the set image size is the image size having an aspect ratio of 16:9, the current image area is determined to be the image area a. Subsequently, the process proceeds to a step S 29 . 
     In the step S 29 , based on the analog imaging signal outputted from the image area determined in the step S 27 , the digital image signal on which the above-described processes such as a signal process are performed is outputted, as the still-image-use through image, to the LCD monitor  4   a . Subsequently, the process proceeds to a step S 30  so as to determine whether or not the half-depressing operation of the still-image shooting button  8   c  is canceled, and the process is waited until YES is determined. When YES is determined in the step S 30 , the process proceeds to a step S 31 . In the step S 31 , it is determined whether or not the still-image shooting button  8   c  is fully depressed. When YES is determined, the process proceeds to a step S 33 , and when NO is determined, the process returns to the step S 1 . 
     Further, when NO is determined in the step S 25 , the process proceeds to a step S 32 . In the step S 32 , it is determined whether or not the button operation identified in the step S 16  is the fully depressing operation of the still-image shooting button  8   c . When YES is determined in the step S 32 , the process proceeds to the step S 33  so as to control to perform the above-described processes such as a signal process based on the analog imaging signal outputted from the set image area and to record the resultant still image on the external memory card  28 . At this time, the still image recorded on the external memory card  28  is thinned out, and the thinned-out image is outputted to the LCD monitor  4   a . Then, the process returns to the step S 1 . 
     Further, when NO is determined in the step S 32 , the process proceeds to a step S 35  so as to determine whether or not the button operation identified in the step S 16  is the depressing operation of the moving-image shooting start/end button  8   b . When NO is determined in the step S 35 , the process returns to the step S 15 , and when YES is determined, the process proceeds to a step S 37 . 
     In the step S 37 , it is determined whether or not the high-speed moving-image shooting mode is set. When YES is determined in the step S 37 , the process proceeds to a step S 39  so as to determine the image area of the CMOS imager  16   a . As described above, in the high-speed moving-image shooting mode in this embodiment, the aspect ratio of the image size is to be determined as the image area a having an aspect ratio of 4:3. Thereafter, the process proceeds to a step S 41 . In the step S 41 , the timer T 22   a  within the CPU  22  is reset and started so as to measure a time period. Then, the process proceeds to a step S 43  to control to perform the above-described processes such as a signal process on the analog imaging signal outputted from the image area determined in the step S 39 , and record the resultant signal on the external memory card  28 . Subsequently, the process proceeds to a step S 45  so as to determine whether or not 10 seconds has been elapsed on the timer T 22   a . When NO is determined, the imaging/recording process in the step S 43  is continued until YES is determined in the step S 45 . When YES is determined, the process proceeds to a step S 53  to stop the above-described imaging and recording process. Then, the process returns to the step S 1 . 
     Further, when NO is determined in the step S 37 , the process proceeds to a step S 47 . When NO is determined in the step S 37 , the current mode is the normal moving-image shooting mode. In the step S 47 , the image area of the CMOS imager  16   a  is determined. As described above, when the set image size is an image size having an aspect ratio of 16:9, the current image area is determined to be the image area b. Subsequently, the process proceeds to a step S 49 . In the step S 49 , it is so controlled that according to the set frame rate, the analog imaging signal is outputted from the image area determined in the step S 47 , the above-described processes such as a signal process are performed on the analog imaging signal, and the resultant signals are sequentially recorded on the external memory card  28 . Then, the process proceeds to a step S 51  so as to determine whether or not the moving-image shooting start/end button  8   b  is depressed again. When NO is determined, the process returns to the step S 49 , and when YES is determined, the process proceeds to the step S 53  so as to end the imaging/recording process. Thereafter, the process returns to the step S 1 . 
     Thus, in the electronic camera  10  according to this embodiment, while waiting for shooting that lasts until the user performs the shooting operation, the moving-image-use through image and the still-image-use through image displayed on the LCD monitor  4   a  are switched easily by depressing the switching button  8   f . Therefore, the user is able to display the through image that satisfies a shooting condition desired by each user. Thereby, the user becomes able to more easily confirm an imaging range, and the convenience is improved. 
     Further, also when the still-image-use through image is displayed, the framework indicating the image size of the moving image is superposed and is displayed on the LCD monitor  4   a , and thus, the user is able to comprehend the image size of the moving image while displaying the still-image-use through image, also making it easy to image the moving image. 
     It is noted that in this embodiment, the CMOS is adopted as the imaging element but a CCD (Charge Coupled Device) may also be adopted. 
     Further, in this embodiment, the signal on which the digital signal converting process is performed in the AFE portion  16   c  is directly inputted to the signal processing portion  18 . However, that signal may be temporarily accommodated in the SDRAM  20  and then the accommodated signal may be outputted from the SDRAM  20  to the signal processing portion  18 . 
     Although the present invention has been described and illustrated in detail, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, the spirit and scope of the present invention being limited only by the terms of the appended claims.