JP3892454B2 - Electronic still camera device - Google Patents

Description

The present invention relates to an electronic still camera equipment, and more particularly to a increase in the editing and the number of shots of the video in the electronic still camera apparatus.

  For example, an electronic camera and an image signal compression device described in Patent Document 1 and Patent Document 2 are disclosed as devices that store an image from an image sensor in a memory, and repeatedly read the image stored in the memory and display it on the same screen. There is an electronic still camera.

  The electronic camera and the image signal compression device disclosed in Patent Document 1 automatically compress the video from the image sensor based on the focal length and the like, thereby increasing the average compression rate of the video and reducing the storage capacity for one video. In addition, the photographer's satisfaction can be taken.

In addition, the electronic still camera described in Patent Document 2 compares the latest video from the image sensor with the video input from the image sensor one time before this video, and only a portion where there is no change in both videos is a still image. As a result, it is possible to obtain a still image with a minimum waiting time without waiting for all the moving images blocking the subject to disappear.
JP-A-4-332281 Japanese Patent Laid-Open No. 3-52457

  However, not only with electronic still cameras, but with general autofocus cameras, even if the photographer intends to focus on the target subject, it actually focuses on another subject, and the intended subject It may not be in focus.

  The present invention has been made to eliminate such disadvantages, and an object of the present invention is to easily edit a video and store a large number of videos.

An electronic still camera device according to the present invention includes an imaging device, image data separation means for separating image data input from the imaging device into color difference data and luminance data, and hue angle calculation for calculating a hue angle based on the color difference data Means, a L index calculating means for obtaining a lightness index L from the luminance data, a color change detecting means for detecting a specific region in which the hue angle level calculated by the hue angle calculating means hardly changes, and a color change detecting means Hue that removes hue components other than white and black in the specific area when the lightness index L in the specific area is obtained by the L index calculation means and the lightness index L in the specific area is outside the preset range And a component editing means. An electronic still camera device according to the present invention includes an imaging device, image data separation means for separating image data input from the imaging device into color difference data and luminance data, and a hue angle that calculates a hue angle based on the color difference data. A calculation means, an L index calculation means for obtaining a lightness index L from the luminance data, a color change detection means for detecting a specific region in which the hue angle level calculated by the hue angle calculation means hardly changes, and a color change detection means. A hue component for removing a hue component other than black in the specific area when the brightness index L in the detected specific area is obtained by the L index calculation means and the calculated brightness index L in the specific area is lower than a preset value. And an editing means. Furthermore, an electronic still camera device according to the present invention includes an imaging device, image data separation means for separating image data input from the imaging device into color difference data and luminance data, and a hue angle for calculating a hue angle based on the color difference data. A calculation means, an L index calculation means for obtaining a lightness index L from the luminance data, a color change detection means for detecting a specific region in which the hue angle level calculated by the hue angle calculation means hardly changes, and a color change detection means. A hue component for removing a hue component other than white in the specific area when the brightness index L in the detected specific area is obtained by the L index calculating means and the calculated brightness index L in the specific area is higher than a preset value. And an editing means. Therefore, it is possible to store many images by reducing the data amount per pixel .

Further, the hue angle calculation means converts the coordinates of the color difference data into the Lab color system, and substitutes the chromaticity indices a and b of the Lab color system into the formula tan (b / a) to calculate the hue angle. To do.

Furthermore, a finder for displaying image data input from the image sensor, a color distribution calculation unit for calculating the spectral energy distribution of the image data based on the color difference data and the luminance data, and the spectral energy distribution calculated by the color distribution calculation unit. By providing the color distribution display means for displaying the image, it is possible for the photographer to shoot the image in which the color balance is achieved by editing the hue constituting the image while viewing the subject .

In addition, by providing editing means for changing the energy value of the hue of the wavelength designated by the photographer to a specified amplification value, the photographer can replace the hue of the wavelength designated by the photographer with another hue, You can change the hue while looking at the subject, and you can shoot images with a good color balance.

According to the electronic still camera device of the present invention, when the lightness index L in the specific area is out of the preset range, the hue components other than white and black in the specific area are removed, so that per pixel The amount of data can be reduced, and thus many images can be stored. The spectral energy distribution of the image input from the image sensor is displayed on the viewfinder, and the energy value of the hue at the wavelength specified by the photographer is amplified to the specified amplification value , or the hue at the wavelength specified by the photographer is amplified to another By replacing with a hue, the photographer can edit the hue constituting the video while looking at the subject and shoot a video with a good color balance.

  FIG. 1 is a block diagram of an electronic still camera apparatus according to an embodiment of the present invention. As shown in the figure, the electronic still camera has a camera body 1, a liquid crystal monitor 2, and a PC card 3.

  The camera body 1 includes a lens unit 4, an optical low-pass filter 5, a CCD 6, an AD converter 7, an image preprocessor (hereinafter referred to as "IPP") 8, a discrete cosine converter (hereinafter referred to as "DCT") 9, and a coder. 10, a memory card controller (hereinafter referred to as “MCC”) 11, a CPU 12, an adaptive differential pulse code modulation (hereinafter referred to as “ADPCM”) 13, a microphone 14, an operation unit 15, a finder 16, and a power supply unit 17. The lens unit 4 adjusts the focus based on the focus adjustment signal from the CPU 12 and forms an image on the CCD 6 through the optical low-pass filter 5. The CCD 6 converts an image sent from the lens unit 4 through the optical low-pass filter 5 into an analog electric signal. The AD converter 7 converts the analog electric signal converted by the CCD 6 into a digital signal.

  The IPP 8 divides the digital image data converted by the AD converter 7 into color difference data and luminance data and performs processing for image compression / decompression. Further, as shown in FIG. 2, the IPP 8 includes a focus center data extraction unit 81, an image data separation unit 82, a color calculation unit 83, and a color display unit 84. The center-of-focus data extraction means 81 is an image of the center of focus 163 that is near the center of the region that is actually in focus from the image data 162 input from the AD converter 7 shown in the configuration diagram of the finder 16 in FIG. Extract data. The image data separating unit 82 separates the image data extracted by the focus center data extracting unit 81 into color difference data and luminance data. The color calculation unit 83 includes a hue angle calculation unit 831, an L index calculation unit 832, and a constituent color calculation unit 833. The hue angle calculation means 831 converts the coordinates of the color difference data separated by the image data separation means 82 into, for example, Lab display system coordinates having the lightness index L and the chromaticity indices a and b, and the chromaticity index of the Lab color system. a and b are obtained, and the hue angle α is obtained from the obtained chromaticity indices a and b. The L index calculating means 832 obtains the lightness index L from the luminance data separated by the image data separating means. The constituent color calculation means 833 is the hue of the image in the central portion of the focus that is near the center of the region that is actually in focus from the hue angle α calculated by the hue angle calculation means 831 and the lightness index L calculated by the L index calculation means 832. Is calculated. The color display unit 84 displays the hue calculated by the color calculation unit 83 by turning on the LED 161 on the finder 16.

  The DCT 9 performs orthogonal transformation, which is one process of JPEG-compliant image compression / decompression processing. The coder 10 is a part that performs one step of JPEG-compliant image compression / decompression processing, and performs high-efficiency image compression / decompression processing by Huffman coding. The MCC 11 temporarily stores the compressed image and the audio data acquired from the microphone 14 and digitizes them, and records them on the PC card 3 and reads them from the PC card 3. The CPU 12 is a part that controls the entire camera body 1, and outputs a focus adjustment signal for adjusting the focus of the lens unit 4 based on image data from the IPP 8, for example. The ADCM 13 digitally converts and compresses the voice input from the microphone 15 and stores it in the PC card 3 via the MCC, or decompresses the voice from the MCC 11.

  The liquid crystal monitor 2 includes an LCD 21, a speaker 22, and a power supply unit 23, and outputs an image and sound from the camera body unit 1.

  With reference to the flowchart of FIG. 4, the operation when the constituent color of the focal center portion is displayed on the finder 16 in the electronic still camera device having the above configuration will be described.

  When the CCD 6 of the camera body 1 inputs video and converts the input video into an analog image signal (step S1), the AD converter 7 converts the analog image signal input by the CCD 6 into digital image data (step S2). . The focus center data extraction means 81 of the IPP 8 extracts the image data of the focus center portion 163 that is near the center of the area actually focused from the digital image data converted by the AD converter 7 (step S3). The image data separating unit 82 separates the image data extracted by the focus center data extracting unit 81 into color difference data and luminance data (step S4). The hue angle calculation means 831 converts the coordinates of the color difference data separated by the image data separation means 82 into, for example, a Lab display system having a lightness index L and chromaticity indices a and b, thereby converting the chromaticity index a of the Lab color system. , B (step S5), and based on the obtained chromaticity indices a, b, the hue angle α is calculated as α = tan (b / a) (step S6). The L index calculation means 832 obtains the lightness index L from the luminance data separated by the image data separation means (step S7). The component color calculation means 833 uses the hue angle α calculated by the hue angle calculation means 831 as six colors of red (R), green (G), blue (B), cyan (C), magenta (M), and yellow (Y). The color of the image is divided into 8 parts with white (W) having a particularly large lightness index L and black (K) having a small lightness index L value. A hue is calculated (step S8). The color display means 84 displays the hue calculated by the color calculation means 83 by turning on the LED 161 on the finder 16 (step S9). In this way, since the hue that constitutes the image of the focal point central portion 163 that is near the center of the region that is actually in focus is displayed by the LED 161 on the finder 16, the photographer can display the hue displayed on the finder 16 and the hue displayed on the finder 16. By comparing the hue of the intended subject, it can be confirmed whether or not the intended subject is in focus.

  Thereafter, the DCT 9 and the coder 10 compress the image data (step S10). When it is confirmed that the subject intended by the photographer is in focus and storage of compressed image data is desired (step S11), the MCC 11 stores the image data compressed by the DCT 9 and the coder 10 in the PC card 3. Store (step S12). Thus, by checking whether or not the subject intended by the photographer is in focus, it is possible to always store a clear video.

  In addition, it is preferable that the photographer can edit while looking at the subject in the backlight state or in the state where the contrast is insufficient. Therefore, as shown in FIG. 5, the IPP 8 a may include an image data separation unit 82, a color distribution calculation unit 85, a color distribution display unit 86, and an editing unit 87. The image data separating unit 82 separates the image data input from the AD converter 7 into color difference data and luminance data. The color distribution calculating unit 85 calculates the spectral energy distribution of the image based on the color difference data and luminance data separated by the image data separating unit 81. The color distribution display means 86 displays the spectral energy distribution calculated by the color distribution calculation means 85 on the finder 16. The editing unit 87 amplifies the hue of the wavelength designated by the photographer from the operation unit 15 or replaces it with another hue.

  The operation when editing an image with the electronic still camera device having the above-described configuration will be described with reference to the flowchart of FIG.

  When the CCD 6 of the camera body 1 inputs video and converts the input video into an analog image signal (step S21), the AD converter 7 converts the analog image signal input by the CCD 6 into digital image data (step S22). The image data separating means 82 of the IPP 8 separates the image data input from the AD converter 7 into color difference data and luminance data (step S23). The color distribution calculating unit 85 calculates the spectral energy distribution of the image based on the color difference data and the luminance data separated by the image data separating unit 82 (step S24). The color distribution display means 86 displays the spectral energy distribution 164 calculated by the color distribution calculation means 85 on the finder 16 as shown in FIG. 7 (step S25). If there is a hue that the photographer wants to amplify or convert to another hue, the photographer instructs to edit the image from the operation unit 15 (step S26). When there is an instruction from the imager to emphasize the hue of the specific wavelength, the editing unit 87 changes the energy value of the hue of the wavelength instructed by the imager to the amplification value specified by the imager ( Steps S27 and S29). In addition, when there is an instruction from the photographer to convert a specific hue into another hue, the editing unit 87 replaces, for example, a blue hue with a red hue or a red hue and a blue hue according to the instruction. The hue is converted by switching (steps S27 and S28). In this way, after editing to the hue desired by the photographer, the DCT 9 and the coder 10 compress the image data (step S30), and the MCC 11 converts the image data that the DCT 9 and the coder 10 have compressed to the PC card 3. (Step S31). In this way, by editing the hue constituting the video while checking with the finder 16, it is possible to easily edit the video with a color balance.

  It is also desirable to reduce the required storage capacity per image so that many videos can be stored. Therefore, the IPP 8b may include an image data dividing unit 88, an image data separating unit 82, a specific color region detecting unit 89, a specific region displaying unit 90, and a black region editing unit 91 as shown in FIG. The image data dividing means 88 divides the image data input from the AD converter 7 into a plurality of areas. The image data separating unit 82 separates the image data of each area divided by the image data dividing unit 88 into color difference data and luminance data. The specific color area detection unit 89 includes a hue calculation unit 831, an L coefficient calculation unit 832, and a color change detection unit 834. The hue angle calculation unit 831 calculates the hue angle α by converting the color difference data to the coordinates of the Lab color system, for example, as already described. The L coefficient calculation means 832 obtains the lightness index L from the luminance data separated by the image data separation means 82. Based on the hue angle α and the lightness index L, the color change detection means 834 changes the constituent colors of the image to red (R), green (G), blue (B), cyan (C), magenta (M), and yellow (Y). , White (W) and black (K). Further, the color change detecting means 834 detects an area in which the level value change in the Lab color coordinate system converted by the hue calculating means 831 is almost not, so that the hue formed in the video input from the CCD 6 is almost the same. An area consisting of one hue is detected. When the specific color area detecting unit 89 detects an area substantially composed of one hue, the specific area display unit 90 displays the detected area on the finder 16 as shown in FIG. When the black area editing means 91 detects that the lightness index L in the area composed of substantially one hue detected by the color change detecting means 834 is lower than a preset value, the black area editing means 91 responds to an instruction input from the operation unit 15. Hue components other than black are removed from the region 165 composed of a substantially black hue.

  The operation in the case of removing hue components other than black in an area composed of substantially one color hue with the electronic still camera device having the above configuration will be described with reference to the flowchart of FIG.

  When the CCD 6 of the camera body 1 inputs video and converts the input video into an analog image signal (step S21), the AD converter 7 converts the analog image signal input by the CCD 6 into digital image data (step S22). The image data separating means 81 of the IPP 8 separates the image data input from the AD converter 7 into color difference data and luminance data (step S23). The hue angle calculation means 831 obtains, for example, the chromaticity indices a and b of the Lab color system from the color difference data separated by the image data separation means 82, and calculates the hue angle α based on the obtained chromaticity indices a and b. (Step S24). The L index calculating means 832 obtains the lightness index L from the luminance data separated by the image data separating means. The color change detecting means 834 determines the hues constituting the image based on the hue angle α and the lightness index L as red (R), green (G), blue (B), cyan (C), magenta (M), yellow (Y ), White (W) and black (K). After that, the color change detection unit 834 detects an area where there is almost no change in the level value of the color of the Lab color system converted by the hue calculation unit 831, so that the hue formed in the image input from the image sensor is almost equal. A region composed of one color hue is detected (step S45). Further, the color change detecting means 834 checks whether the detected area composed of substantially one hue corresponds to the hue divided into eight hues, and whether or not the area composed of almost one hue is an area composed of black hue. Check out.

  The specific area detecting means 90 displays an area consisting of substantially one hue on the finder 16 as already described (step S46). When the area of almost one hue is an area of black hue and an instruction to erase data of other hue components in the area is input from the operation unit 15, the black area editing unit 91 displays the area of the area. Data of components of hues other than black are erased (step S49). Thereafter, the DCT 9 and the coder 10 compress the image data (step S50), and the MCC 11 stores the image data compressed by the DCT 9 and the coder 10 in the PC card 3 (step S51). For example, when information that is not necessary is included in an outline image that may be black, such as the night sky, one image can be obtained by erasing the hue components other than black in the region composed of a substantially black hue. Reduce the amount of data per hit so that many images can be stored.

  In the above-described embodiment, an area composed of a substantially black hue has been described. However, a similar process may be performed on an area composed of a white hue.

  Further, although the hue is divided using the coordinates of the Lab display system, coordinates of the uv display system may be used, for example.

  The present invention is not limited to the above-described embodiments, and it goes without saying that various modifications and substitutions are possible as long as they are described within the scope of the claims.

It is a block diagram which shows the Example of this invention. It is a block diagram of IPP. It is a block diagram of a finder visual field. It is a flowchart which shows operation | movement of an electronic still camera apparatus. It is a block diagram of IPP which displays color distribution. It is a flowchart which shows the operation | movement which displays color distribution. It is a block diagram of the field of view of a finder expressing the color distribution. It is a block diagram of IPP which detects the area | region which consists of the same structure color. It is a block diagram of the visual field of the finder which displays the area | region which consists of the same structure color. It is a flowchart which shows the operation | movement which displays the area | region which consists of the same structure color.

Explanation of symbols

1 Camera Body 2 LCD Monitor 3 PC Card 4 Lens Unit 6 CCD
7 AD converter 8 IPP
81 focus center data extracting means 82 image data separating means 83 color calculating means 84 color displaying means 85 color distribution calculating means 86 color distribution displaying means 87 editing means 88 image data dividing means 89 specific color area detecting means 90 specific color area displaying means 91 Black area editing means 15 Operation section 16 Finder

Claims (7)

An image sensor ;
Image data separation means for separating image data input from the image sensor into color difference data and luminance data;
Hue angle calculation means for calculating a hue angle based on the color difference data;
L index calculating means for obtaining a lightness index L from the luminance data;
A color change detecting means for detecting a specific region in which there is almost no change in the level of the hue angle calculated by the hue angle calculating means;
The lightness index L in the specific area detected by the color change detection means is obtained by the L index calculation means, and when the lightness index L in the obtained specific area is outside a preset range, white in the specific area, Hue component editing means for removing hue components other than black; and
Electronic still camera apparatus characterized by comprising a. An image sensor;
Image data separation means for separating image data input from the image sensor into color difference data and luminance data;
Hue angle calculation means for calculating a hue angle based on the color difference data;
L index calculating means for obtaining a lightness index L from the luminance data;
A color change detecting means for detecting a specific area where there is almost no change in the level of the hue angle calculated by the hue angle calculating means;
The lightness index L in the specific area detected by the color change detection means is obtained by the L index calculation means, and when the lightness index L in the obtained specific area is lower than a preset value, other than black in the specific area Hue component editing means for removing the hue component of
An electronic still camera device comprising: An image sensor;
Image data separation means for separating image data input from the image sensor into color difference data and luminance data;
Hue angle calculation means for calculating a hue angle based on the color difference data;
L index calculating means for obtaining a lightness index L from the luminance data;
A color change detecting means for detecting a specific area where there is almost no change in the level of the hue angle calculated by the hue angle calculating means;
When the brightness index L in the specific area detected by the color change detection means is obtained by the L index calculation means, and the brightness index L in the obtained specific area is higher than a preset value, the color area other than white in the specific area Hue component editing means for removing the hue component of
An electronic still camera device comprising: The hue angle calculation means converts the coordinates of the color difference data into a Lab color system, substitutes the chromaticity indices a and b of the Lab color system into the formula tan (b / a), and calculates the hue angle. electronic still camera equipment according to any one of claims 1 to 3, characterized in that calculated. A finder for displaying image data input from the image sensor, a color distribution calculation unit for calculating a spectral energy distribution of the image data based on the color difference data and the luminance data, and a spectral energy calculated by the color distribution calculation unit 5. The electronic still camera device according to claim 1, further comprising color distribution display means for displaying a distribution on the viewfinder. 6. The electronic still camera device according to claim 5, further comprising editing means for changing the energy value of the hue of the wavelength designated by the photographer to a specified amplification value. 7. The electronic still camera device according to claim 5, wherein the hue of the wavelength designated by the photographer is replaced with another hue.

Images