JP4500711B2 - Camera integrated recording and playback device - Google Patents

Description

  The present invention relates to an image display device used in a camera-integrated VTR or the like.

  2. Description of the Related Art Conventionally, a camera-integrated recording / reproducing apparatus has been developed mainly for recording and reproducing moving images on a magnetic tape and for viewing captured images on a television. As an image display device used for confirming a photographed image in this camera-integrated recording / reproducing device, a liquid crystal display device that is most balanced in terms of cost, size, and performance is currently generally used. . However, the liquid crystal display device has a drawback that its dynamic range is narrower than that of a CRT.

  Here, the brightness of the display image of the liquid crystal display device depends on the luminance of the backlight irradiated from the back surface of the liquid crystal panel. However, increasing the luminance of the backlight directly increases the power consumption. In a camera-integrated recording / reproducing apparatus that is often driven by a battery, an increase in power consumption leads to a decrease in battery duration, resulting in poor usability of the apparatus. Therefore, in order to make the displayed image look bright even with the narrow dynamic range of the liquid crystal and the limited backlight luminance, the image signal processing unit of the liquid crystal drive circuit raises the intermediate luminance and the high luminance part is slightly saturated. By making the image display device, an image display device with a good appearance is provided while suppressing an increase in power consumption.

  On the other hand, with the spread of digital cameras in recent years, in addition to a mode for recording moving images on tape as in the past, a camera integrated type equipped with a function for recording still images on a semiconductor storage device (hereinafter referred to as a memory card) like a digital camera Recording / reproducing apparatuses are becoming widespread. In many cases, still images recorded on a memory card are printed by an externally connected printer.

In general, video signal characteristics that are optimal for viewing on a television are different from video signal characteristics that are optimal for printing. Therefore, in the camera-integrated recording / reproducing apparatus having the moving image shooting function and the still image shooting function as described above, whether the final output form is TV or printing in the camera signal processing circuit at the time of shooting. Accordingly, setting values of video signal characteristics such as gamma, edge enhancement , and white balance are changed (see Patent Document 1).

However, in the image display device used in the conventional camera-integrated recording / playback device, the video signal characteristics are not switched according to the shooting mode, for example, so that the image of the video signal characteristics in the moving image mode looks optimal. Only the image was displayed with the above-mentioned image quality using the dynamic range of the liquid crystal panel to the very minimum. On the other hand, in a display device such as a personal computer, not a camera-integrated recording / playback device, a technique is known in which display characteristics vary depending on connected devices (see Patent Document 2).
Japanese Patent No. 4035263 JP 2001-338289 A

  As described above, in an image display device using a liquid crystal display panel, an image is created using the dynamic range of the liquid crystal display panel as much as possible in order to emphasize the appearance. Since the dynamic range of the liquid crystal display panel is utilized to the maximum extent, it is likely to be saturated when a video signal having a higher level than previously assumed is input. For example, when the gamma and contrast of a video signal suitable for printing are high compared to the video signal characteristics suitable for viewing on a television, the liquid crystal display panel optimizes the image quality with the video signal suitable for viewing on a television. In addition, when a video signal having characteristics suitable for printing is input, the low-luminance portion and the high-luminance portion are saturated, and gradation reproduction becomes impossible. This is a so-called “blackout” or “whiteout” phenomenon, and this phenomenon significantly impairs the visibility of the subject. Conversely, when a video signal with low gamma and contrast is input to an image display device optimized for input video signals with high gamma and contrast, the image is displayed with low brightness and contrast, and the visibility is similarly poor. .

  As described above, in the conventional camera-integrated recording / reproducing apparatus, when an image having a video signal characteristic suitable for printing is displayed on an image display apparatus optimized with a video signal characteristic suitable for viewing on a television, or Even in the reverse case, there is a drawback that the visibility of the image display device deteriorates.

In order to solve the above problems, an imaging apparatus according to the present invention records on a recording medium an imaging unit capable of imaging in a plurality of imaging modes having different video signal characteristics and an image of the video signal characteristics captured by the imaging unit. Recording means and an image having video signal characteristics corresponding to each photographing mode recorded by the recording means at the same time when the recording means records the image on a recording medium, and the input image is subjected to predetermined processing. subjecting a display control means for displaying on the image display device, the by, the display control unit, when the imaging mode of the imaging means is a first imaging mode, the recording means the first imaging mode fill before by applying a first contrast control for the corresponding image of the first contrast characteristics input at the same time as recorded in an image recording medium of the first contrast characteristic And performs processing of changing the video signal characteristic of the image, when the imaging mode of the imaging means is a second imaging mode, the higher than the first contrast characteristic which the recording means corresponding to the second imaging mode The second contrast adjustment is performed on the image having the second contrast characteristic which is input simultaneously with the recording of the image having the two contrast characteristics on the recording medium, and the degree of decrease is larger than that of the first contrast adjustment. the process of changing the video signal characteristic line Ukoto, controls to reduce the difference in the video signal characteristics between the first and the second photographing mode of the image to be displayed on the image display device.

According to the present invention, for example, a shooting mode with video signal characteristics suitable for output mainly to a television, a shooting mode with video signal characteristics suitable for printing purposes, etc. Even if the characteristics of the video signal such as gamma, brightness, and contrast change according to the difference in the final output format of recording, the image display device is constant by switching the video signal characteristics of the image display device so as to correct the characteristic difference. The image of the image quality of will come to be displayed .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a basic configuration of an embodiment of a camera-integrated recording / reproducing apparatus of the present invention.

  In the figure, the user selects the tape mode or the card mode with the shooting mode changeover switch 13. The selection result is supplied to the microcomputer 14, which controls the camera signal processing circuit 17 and the memory 6 of the liquid crystal driving circuit 2. The image input from the lens 15 is photoelectrically converted by the CCD 16 and supplied to the camera signal processing circuit 17. The video signal image-processed by the camera signal processing circuit 17 is supplied to the recorder circuit 18 when the shooting mode changeover switch 13 is in the tape mode, subjected to recording signal processing, and then recorded on the tape 19 as a recording medium. At the same time, it is supplied to the video output terminal 12 and the input terminal 1 of the liquid crystal driving circuit 2. When the photographing mode change-over switch 13 is in the card mode, the video signal is supplied to the recorder circuit 18 and processed by the recording signal, and then recorded on the memory card 20 as a recording medium. Are supplied to the input terminal 1.

  The video signal input to the input terminal 1 is supplied to the liquid crystal drive circuit 2, and the contrast adjustment circuit 3 for adjusting the amplitude in the liquid crystal drive circuit 2, the brightness adjustment circuit 4 for adjusting the setup level, and the gamma characteristic. The image signal is processed by a gamma adjustment circuit 5 for adjusting the image and further by a polarity inversion circuit (not shown) or the like, and then supplied to the image display device 10 to display an image. In the contrast adjustment circuit 3, the brightness adjustment circuit 4, and the gamma adjustment circuit 5, adjustment values are set based on the control data 7 or 8 and 9 stored in the memory 6.

  In the above configuration, the camera signal processing circuit 17 has video signal characteristics set in advance so that a display image of an external monitor (not shown) connected to the video output terminal 12 is optimized when the shooting mode switch 13 is in the tape mode. Signal processing. Further, when the photographing mode change-over switch 13 is in the card mode, the signal processing is performed to the video signal characteristics set in advance so that the print image on the printer (not shown) connected to the printer output terminal 11 is optimized.

  The control data for controlling the contrast adjustment circuit 3, the brightness adjustment circuit 4, and the gamma adjustment circuit 5 in the liquid crystal drive circuit 2 is, for example, control data A optimized for the camera image in the tape mode and the camera image quality in the card mode. The optimized data is stored in the memory 6 as the control data B, and the data arbitrarily set by the user is stored as the control data C.

  Table 1 is a data table showing combinations of data in the memory 6. In the table, the control data A sets the adjustment values of contrast, brightness, and gamma to values most suitable for the image of the video signal characteristic in the tape mode, and includes values a1, b1, and c1, respectively. Similarly, the control data B is set to a value most suitable for the image of the video signal characteristic in the card mode, and has values a2, b2, and c2, respectively. The control data C is an image quality mode arbitrarily set by the user and has values a3, b3, and c3, respectively.

  For example, when the camera signal processing circuit 17 sets the contrast of the video signal in the card mode higher than the video signal characteristic in the tape mode, the contrast control data a1 in the tape mode is set in the contrast adjustment circuit 3 of the liquid crystal driving circuit. On the other hand, if the contrast control data a2 in the card mode is lowered, the image display device 10 can always display an image with a constant video signal characteristic regardless of the shooting mode.

  As described above, even when the video signal characteristics input to the liquid crystal driving circuit 2 change according to the shooting mode, the liquid crystal driving circuit 2 uses the control data optimized for each video signal characteristic to control contrast, brightness, etc. Therefore, an optimal image is always displayed on the image display device 10.

  In particular, when a liquid crystal panel is used for the image display device 10, the dynamic range of the liquid crystal panel is narrow due to its characteristics. Therefore, when a video signal having a larger amplitude is input to the one optimized with the video signal characteristics under certain conditions. The display image is saturated and the image display is inferior in the gradation reproduction performance of the high-brightness part so-called “whiteout”. However, according to the configuration of the present invention, the image quality of the display device is optimized according to the mode. Therefore, the above-mentioned problem does not occur.

  In the first embodiment, the video signal characteristics of the imaging device are switched depending on whether the recording medium is a tape or a card. However, as another embodiment, a moving image mode for shooting a moving image instead of the tape mode, a card mode Instead, a method of switching to a still image mode for capturing a still image and switching a video signal characteristic of the imaging apparatus depending on whether a moving image is captured or a still image is captured is also conceivable. The effects of the system configuration and the invention are the same as in the first embodiment.

1 is a block diagram showing a basic configuration of an embodiment of a camera-integrated recording / reproducing apparatus of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Input terminal 2 Liquid crystal drive circuit 3 Contrast adjustment circuit 4 Brightness adjustment circuit 5 Gamma adjustment circuit 6 Memory 7 1st control data 8 2nd control data 9 3rd control data 10 Image display apparatus 11 Printer output terminal 12 Video output Terminal 13 Shooting mode switch 14 Microcomputer 15 Lens 16 CCD
17 Camera signal processing circuit 18 Recorder circuit 19 Tape 20 Memory card

Claims (3)

Imaging means capable of shooting in a plurality of shooting modes having different video signal characteristics;
A recording unit that records an image of the video signal characteristic captured by the imaging unit on a recording medium;
At the same time when the recording unit records the image on a recording medium, an image having video signal characteristics corresponding to each shooting mode recorded by the recording unit is input, and the input image is subjected to predetermined processing to display an image. Display control means for displaying on the device,
The display control means may control, when the photographing mode of the image pickup means is a first imaging mode, at the same time as recording an image of the first contrast characteristic which the recording means corresponding to said first photographing mode in a recording medium When the image signal characteristic of the input image is changed by applying a first contrast adjustment to the input image having the first contrast characteristic, and the imaging mode of the imaging unit is the second imaging mode. The recording means records the second contrast characteristic image higher than the first contrast characteristic corresponding to the second photographing mode on the recording medium at the same time as the second contrast characteristic image is input. By applying the second contrast adjustment whose degree of decrease is larger than that of the one contrast adjustment, the video signal characteristics of the input image are changed. The management in line Ukoto, imaging device and controlling so as to suppress the difference in the video signal characteristics between the first and the second photographing mode of the image to be displayed on the image display device. First photography mode of the imaging means is a moving image mode for use in display on a television, the second imaging mode of the imaging means, and wherein the still image mode der Rukoto for use in printing The imaging apparatus according to claim 1. First photography mode of the imaging means is a tape mode for recording a video on a magnetic tape, a second imaging mode of the imaging means, and wherein the card mode der Rukoto for recording a still image to the semiconductor memory device The imaging apparatus according to claim 1.

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