JP2007158701A - Color fidelity camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a color fidelity camera that can obtain a photographed image whose colors are reproduced with high fidelity, and improve the convenience of a user. <P>SOLUTION: A digital camera 10 includes: a CCD 22 for imaging an object; a lens 12 for forming light from the object onto the CCD 22; a reflection mirror 38 for reflecting the light from a colorimetry object position selected among a plurality of colorimetry object positions within an imaging range into a prescribed direction; a colorimeter 42 for measuring colors of the light reflected in the reflection mirror 38 and outputting colorimetry data; a reflection mirror drive unit 40 for driving the reflection mirror 38 to be selectively located to either of a prescribed position A on an optical path R of the light from the object and a prescribed position B at the outside of the optical path R and adjusting a tilt angle of the reflection mirror 38 so as to make the light from the selected colorimetry object position incident onto the colorimeter 42; and a control section 20 for correcting image data of the object imaged by the CCD 22 on the basis of the colorimetry data. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a color fidelity camera, and more particularly to a color fidelity camera that corrects a captured image of a subject based on a color measurement result obtained by a colorimeter.

  In general, an image of a subject captured by an electronic still camera such as a digital camera is likely to cause a color fog phenomenon that is biased to a color according to illumination light, and so-called white balance correction is performed to correct this color fog phenomenon. ing.

  For example, in Patent Document 1, when the fireworks shooting mode is selected, the exposure time is fixed to a long time before the release operation, the lens focus is fixed to infinity, and the white balance is set to substantially the same as that of sunlight. An electronic still camera that shortens the release time lag by fixing is disclosed.

  In addition, as one method of color correction such as white balance correction, color information such as light chromaticity and color temperature is detected by a colorimeter separate from the electronic still camera, and the color measurement is performed based on the color measurement result. There is something to correct.

In this case, before the subject is imaged by the electronic still camera, the color sample such as a color chart on which a plurality of color samples are printed is measured by the colorimeter, and the color measurement data is obtained. Based on this, the image capturing condition and the like of the electronic still camera are set to shoot, and the image after shooting is corrected.
JP 2001-311977 A

  However, in the above prior art, since the electronic still camera and the colorimeter are separate, the result is that the accurate colorimetric data obtained by the colorimeter is indirectly used, and the photographed image faithfully reproduced. Is difficult to get. In addition, if the electronic still camera and the colorimeter are separate, it is difficult to determine the position of the colorimetric object accurately from a normal subject and perform colorimetry using a color chart. However, it is inconvenient to carry the colorimeter and the color chart, and the photographing work itself becomes complicated and the convenience for the user is deteriorated, so that a decisive photo opportunity may be missed.

  In this case, the convenience can be improved by incorporating a colorimeter in the electronic still camera. However, only the light from the position to be measured must be incident on the colorimeter. It is difficult to obtain data easily.

  The present invention has been made to solve the above-described problems, and can obtain a photographed image with faithful color reproduction and easily obtain colorimetric data, thereby improving user convenience. The objective is to obtain a color fidelity camera that can

  In order to achieve the above object, a color fidelity camera according to a first aspect of the present invention includes an imaging unit that images a subject, a lens that forms an image of light from the subject on the imaging unit, and a plurality of lenses within an imaging range. A reflection unit that reflects light from the color measurement target position selected from the color measurement target position in a predetermined direction; a color measurement unit that measures the light reflected by the reflection unit and outputs the color measurement data; Between the imaging means and the lens and at any one of a first predetermined position on the optical path of light from the subject and a second predetermined position outside the optical path of light from the subject A drive unit that drives the reflection unit to be selectively disposed, and an inclination angle of the reflection unit is adjusted so that light from the selected color measurement target position is incident on the color measurement unit. And adjusting means to perform the above-mentioned colorimetric data, Characterized by comprising a correction means for correcting the image data of the subject captured by the image unit.

  According to the present invention, the reflecting means transmits light from the color measurement target position selected from the plurality of color measurement target positions within the imaging range among the light incident on the lens in a predetermined direction, that is, the direction of the color measurement means. Reflect to lead to. For example, as described in claim 5, the reflecting means may be a total reflection mirror.

  The color measurement means measures the light reflected by the reflection means and outputs the color measurement data. For example, spectroscopic spectrum data is obtained by dispersing reflected light, and a chromaticity value as colorimetric data is obtained from the spectroscopic spectrum data.

  The driving unit is located between the imaging unit and the lens at any one of a first predetermined position on the optical path of light from the subject and a second predetermined position outside the optical path of light from the subject. , Driving so that the reflecting means is selectively disposed.

  The adjustment unit adjusts the inclination angle of the reflection unit so that light from the color measurement target position selected from the plurality of color measurement target positions enters the color measurement unit.

  The correcting unit corrects the image data of the subject imaged by the imaging unit based on the colorimetric data.

  As described above, since the image data of the image obtained by photographing the subject is color-corrected based on the colorimetric data measured by the colorimetric means, the color of the subject can be faithfully reproduced. In addition to the built-in color measuring means, the reflecting means for guiding the light incident from the lens to the color measuring means is either a first predetermined position on the optical path of light from the subject or a second predetermined position outside the optical path. Since it can be selectively placed at such a position, it is not necessary to carry a colorimeter independent of the camera. Furthermore, since the adjustment means for adjusting the inclination angle of the reflection means so that the light from the selected color measurement target position is incident on the color measurement means is provided, the color measurement data can be easily obtained. It is possible to improve user convenience.

  The position of the chromaticity pixel on the peripheral side of the visible light region on the chromaticity diagram among the pixels of the colorimetric image picked up for colorimetry by the image pickup means. Further, a selection unit that selects a plurality of color measurement target positions may be provided.

  As described above, the position of the pixel having the chromaticity on the peripheral side of the visible light region on the chromaticity diagram is measured as the color measurement target position, that is, the color measurement target position is selected from a wide range as much as possible. This makes it possible to correct with higher accuracy by the correcting means.

  In addition, as described in claim 3, the color measurement image may be an image obtained by capturing a color chart on which a plurality of color samples having different colors are printed.

  In this case, it is preferable to use a color chart on which color samples of colors selected in a balanced manner from a wide color gamut are printed. Thereby, it is possible to correct with higher accuracy by the correction means.

  According to a fourth aspect of the present invention, the correcting unit generates a color correction matrix based on the colorimetric data and image data of a colorimetric image captured for colorimetry by the imaging unit. And the image data of the subject imaged by the imaging means may be corrected based on the color correction matrix.

  The creating means creates a color correction matrix using a least square method or the like so that the difference between the colorimetric data and the image data of the colorimetric image becomes small, for example. By correcting the image data of the subject using the color correction matrix created in this way, it is possible to correct with high accuracy and to obtain image data with faithful color reproduction.

  According to a sixth aspect of the present invention, the color measurement target position, and tilt angle information related to the tilt angle of the reflecting means when light from the color measurement target position is incident on the color measurement means, It is good also as a structure further provided with the memory | storage means which memorize | stored the correspondence. Thereby, the inclination angle of the reflecting means can be easily adjusted.

  In this case, as described in claim 7, the inclination angle information may be a rotation angle of the reflecting means corresponding to the inclination angle.

  In addition, as described in claim 8, the adjusting means includes a first rotating means for rotating the reflecting means about a predetermined first axis, and a first rotating means orthogonal to the first axis. It is good also as a structure containing the 2nd rotation means to rotate the said reflection means centering on 2 axis | shafts. Thereby, light from an arbitrary position in the photographing range can be easily incident on the reflecting means.

  According to a ninth aspect of the present invention, the adjusting unit includes a rotating unit that rotates the reflecting unit about a predetermined first axis, and a second axis that is orthogonal to the first axis. And a moving means for moving the color measuring means in the longitudinal direction. Also with such a configuration, light from an arbitrary position in the photographing range can be easily incident on the reflecting means.

  According to a tenth aspect of the present invention, the adjustment unit is configured to cause a position of an image point on the imaging unit of light incident from the lens to be slightly shifted in a predetermined direction when the subject is photographed. The imaging unit may be configured to image a plurality of times while tilting the reflecting unit.

  Thus, if it is a still image, it can image | photograph several times by what is called pixel shift, and can synthesize | combine these and can obtain a high-resolution captured image.

  In addition, as described in claim 11, the colorimetric data and the image data may further include a conversion unit that converts the colorimetric data and the image data into a predetermined color system. Thereby, it is possible to deal with various color system data and flexibly deal with various requests.

  According to the present invention, it is possible to obtain a photographed image faithfully reproduced in color, obtain colorimetric data easily, and improve user convenience.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the present embodiment, the present invention is applied to a digital camera.

  First, a digital camera to which the present invention is applied will be described with reference to FIG.

  As shown in FIG. 1, the digital camera 10 includes a lens 12 and a diaphragm 14 that adjusts the amount of light passing through the lens 12. The lens 12 is composed of one or a plurality of lenses, and may be a single focal length (fixed focus) lens or a variable focal length lens such as a zoom lens or a telephoto / wide-angle bifocal switching lens. .

  The lens 12 is driven in the direction of the optical axis of the incident light by the lens driving device 16 and can change the focal length. The diaphragm 14 is configured to be driven by a diaphragm driving device 18 and to change its opening area. The lens driving device 16 and the aperture driving device 18 respectively drive the lens 12 and the aperture 14 in accordance with instructions from a control unit 20 including a microcomputer or the like.

  The light of the subject image that has passed through the lens 12 and the aperture 14 is formed on the light receiving surface of the CCD 22 as an imaging means. The CCD 22 is a color CCD provided with a number of sensors corresponding to R (red), G (green), and B (blue) color components. Light received by these sensors is converted into an electrical signal corresponding to the amount of light, and is output to the imaging signal processing unit 24 as analog image signals of R, G, and B colors. The CCD 22 is driven by a CCD driving device 26. The CCD driving device 26 drives the CCD 22 in accordance with instructions from the control unit 20.

  The imaging signal processing unit 24 performs predetermined analog signal processing on the analog image signals of R, G, and B colors output from the CCD 22, and A / D converts the analog image signals into digital image data. Process.

  The control unit 20 performs overall control of the above-described units and converts the digital image data from the imaging signal processing unit 24 into a predetermined image format or a predetermined color system, for example, and stores it in the nonvolatile memory 28, for example. Or stored in a memory card (not shown) or the like via the external I / F 30.

  The control unit 20 is connected with an operation unit 32 for performing various operations. The operation unit 32 includes a mode setting switch 34 for performing a mode setting operation, a color measurement switch 35 for operating a colorimeter 42 to be described later, a shutter switch 36 for giving an instruction to start recording an image, Camera mode selection means, zoom operation means, and various other input means are included.

  The digital camera 10 also includes a reflection mirror 38 for changing the optical path of the light that has passed through the lens 12 and the aperture 14. The reflection mirror 38 is a total reflection mirror as an example in the present embodiment, and is either one of a predetermined position A on the optical path R of light that has passed through the lens 12 and the diaphragm 14 and a predetermined position B outside the optical path R. It can be arranged at the position and is driven by the reflection mirror driving device 40.

  The reflection mirror driving device 40 drives the reflection mirror 38 in the direction of arrow C in FIG. 1 so that the reflection mirror 38 is positioned at the predetermined position A or the predetermined position B according to an instruction from the control unit 20.

  The reflection mirror driving device 40 drives the reflection mirror 38 so that the reflection mirror 38 is inclined at a predetermined angle according to an instruction from the control unit 20 with the reflection mirror 38 disposed at the predetermined position A. As shown in FIG. 2, the reflection mirror driving device 40 includes a motor 40 </ b> A that rotates in the direction of arrow F <b> 1 in the drawing around a first vertical axis E <b> 1 including the center D of the reflection mirror 38, and the reflection mirror 38. And a motor 40B that rotates in the direction of arrow F2 in the drawing around a second axis E2 in the left-right direction including the center D. That is, the reflection mirror drive device 40 can adjust the rotation angle θ1 of the reflection mirror 38 in the arrow F1 direction and the rotation angle θ2 in the arrow F2 direction. Here, the rotation angle θ1 is a rotation angle with respect to a predetermined position (origin) of the reflection mirror 38 in the direction of arrow F1, and the rotation angle θ2 is a rotation of the reflection mirror 38 with respect to a predetermined position in the direction of arrow F2. Is an angle.

  When the reflection mirror 38 is disposed at the predetermined position A, the light that has passed through the lens 12 and the aperture 14 is reflected by the reflection mirror 38 toward the colorimeter 42, and the optical path R is changed. In this state, a color measurement process to be described later is executed. On the other hand, except when the color measurement process is executed, the reflection mirror 38 is disposed at a predetermined position B, and the optical path R of the light passing through the lens 12 and the diaphragm 14 is not changed and is incident on the CCD 22 as it is.

  In this manner, the reflection mirror driving device 40 can tilt the reflection mirror 38 at a desired angle in two different directions, so that light at an arbitrary position in the imaging range can enter the colorimeter 42. The inclination angle of the reflection mirror 38 is set according to the color measurement target position described later.

  When the color measurement switch 35 is turned on, a color measurement process described later is executed. In this color measurement processing, a subject is imaged, a color measurement target position is selected from the image, and the tilt angle of the reflection mirror 38 is adjusted so that light from that position enters the color meter 42. Measure the color. The color measurement data at each color measurement target position is output to the control unit 20 and stored in the memory 28. The control unit 20 creates a color correction matrix based on the colorimetric data stored in the memory 28, and corrects the captured image data based on the color correction matrix.

  As shown in FIG. 3, the colorimeter 42 includes a CPU 44 as a central processing unit, a RAM 46 configured to temporarily store data, a ROM 48 configured with a nonvolatile memory such as a flash ROM, and the like. An input / output interface (I / O) 50 is connected via a bus 52, and a spectroscope 54 and a converter 58 are connected to the I / O 50.

   When the spectroscope 54 is instructed by the CPU 44 to perform color measurement, the spectroscope 54 measures the spectral spectrum of the incident light and outputs the spectral spectrum data to the conversion unit 58.

  The conversion unit 58 calculates and outputs tristimulus values X, Y, Z and chromaticity values x, y in the XYZ color system of the CIE (International Commission on Illumination) based on the spectral data. The chromaticity values x and y can be obtained from the tristimulus values X, Y and Z, and can be obtained by x = X / (X + Y + Z) and y = Y / (X + Y + Z). Note that the conversion from the spectral data to the tristimulus values X, Y, Z and the chromaticity values x, y is executed with high accuracy by the method defined in JISZ8722.

  As shown in FIG. 4, the color system here refers to a color space in which colors can be expressed in a chromaticity diagram. For example, a bell-shaped color space 60 that can express all colors in the visible light region (FIG. 4 is a region that is displayed for a certain brightness. That is, equi-energy spectral color light is displayed in three dimensions in XYZ, Projecting the intersection group with the unit plane (plane containing the points (XYZ) = (100), (010), (001)) on the XY plane is a bell-shaped space in the xy chromaticity diagram. Is the XYZ color system.

  The conversion from the RGB color system to the XYZ color system can be calculated using a 3 × 3 conversion matrix as shown in the following equation (1).

Here, R, G, and B are image data input as one pixel in the image, and X, Y, and Z are image data to be output. Each value of the matrix is stored in advance in a ROM 48 constituted by, for example, a flash ROM.

The conversion unit 58 may have a function of converting to another color system such as the L ^* a ^* b ^* color system.

  In addition to the above, the digital camera 10 includes a device included in a general digital camera such as a strobe light emitting device, but is omitted in this embodiment for the sake of simplicity.

  Next, as an operation of the present embodiment, processing executed by the control unit 20 will be described with reference to flowcharts shown in FIGS.

  First, color measurement processing executed before photographing by the digital camera 10 will be described with reference to a flowchart shown in FIG. Note that the color measurement processing routine shown in the figure is executed when the color measurement switch 35 is turned on by a user operation.

  At the time of color measurement, the user directs the lens toward a subject suitable for color measurement and presses the shutter switch 36. Here, the subject suitable for colorimetry is a subject whose captured image includes various colors, in other words, a subject having a wide color gamut, and includes a wide range of colors in the color space 60 of FIG. Subject.

  In step 100, it is determined whether or not the shutter switch 36 is pressed. If the shutter switch 36 is pressed, the process proceeds to step 102. If the shutter switch 36 is not pressed, the shutter switch 36 is Wait until it is pressed.

  In step 102, the same imaging process as in normal shooting is performed. As a result, the subject is imaged by the CCD 22, and image data of each color of R, G, B is obtained.

  In step 104, a colorimetric target position within the photographing range is selected based on the image data of the photographed image. Specifically, first, image data of a photographed image is converted into chromaticity values x and y. A plurality of pixels having a chromaticity value on the peripheral side in the color space 60 are selected from the pixels of the photographed image, and the pixel positions are stored in the memory 28 as colorimetric target positions. The color measurement target position is represented by a two-dimensional coordinate value on the image. In this embodiment, as shown in FIG. 7, the positions of six pixels P1 to P6 having chromaticity values on the peripheral side of the color space 60 as compared with other pixels are selected as the colorimetric target positions. However, the number of pixels to be selected is not limited to this.

  In step 105, the reflection mirror driving device drives the reflection mirror 38 so that the reflection mirror 38 is disposed at the predetermined position A, that is, the light passing through the lens 12 and the aperture 14 is guided to the colorimeter 42. 40. As a result, the reflection mirror driving device 40 drives the reflection mirror 38 and advances the reflection mirror 38 to the predetermined position A.

  In step 106, the inclination angle of the reflection mirror 38 is set such that light from the color measurement target position to be measured this time is incident on the spectroscope 54 among the plurality of color measurement target positions selected in step 104. Then, the reflecting mirror 38 is driven.

  In order to drive the reflection mirror 38 so that only light from the color measurement target position to be measured this time is incident on the spectroscope 54, for example, the pixel position of each pixel in the photographing range and the reflection mirror corresponding to each pixel position The correspondence relationship between the rotation angle θ1 and the rotation angle θ2 corresponding to the 38 tilt angles is stored in advance in the memory 28 using an arithmetic expression, table data, or the like. Here, the tilt angle of the reflection mirror 38 corresponding to the pixel position is an angle at which only light from the pixel position is incident on the spectroscope 54 if the reflection mirror 38 is tilted to this angle.

  The control unit 20 obtains rotation angles θ1 and θ2 corresponding to the colorimetric target position to be measured from the correspondence relationship stored in the memory 28, and causes the reflection mirror driving device 40 to rotate the reflection mirror 38 at this rotation angle. Instruct. Thus, the reflection mirror driving device 40 drives the reflection mirror 38 so that the designated reflection mirror 38 has the designated rotation angles θ1 and θ2, and only the light from the colorimetric target position to be measured is spectrally separated. Incident on the vessel 54.

  In step 108, the colorimeter 42 is instructed to perform color measurement. Thereby, the light from the color measurement target position is measured by the spectroscope 54 of the colorimeter 42, and the chromaticity values x and y are output to the control unit 20.

  In step 110, the color measurement data of the color measurement target position output from the colorimeter 42 is stored in the memory 28.

  In step 112, it is determined whether or not color measurement has been completed for all the color measurement target positions. If all color measurement has not been completed, the process returns to step 106 and the same processing as described above is repeated. That is, the rotation angle θ1 corresponding to the color measurement target position so that the inclination angle of the reflection mirror 38 becomes an angle at which light from the color measurement target position to be measured next enters the spectroscope 54, θ2 is obtained from the correspondence stored in the memory 28, and the reflection mirror driving device 40 is instructed, and thereafter the same processing is executed. By repeating this process until the color measurement of all the color measurement target positions P1 to P6 is completed, the color measurement data of each color measurement target position can be acquired.

  When the colorimetry of all the colorimetric target positions is completed, the process proceeds to step 113, and the reflection mirror is driven so that the reflection mirror 38 is retracted to the position of the predetermined position B that is outside the optical path of the light that has passed through the lens 12 and the aperture stop 14. Instruct the device 40. As a result, the reflecting mirror 38 moves back to the predetermined position B, and normal photographing is possible.

  In step 114, a color correction matrix is created based on the colorimetric data of P 1 to P 6 and stored in the memory 28.

  Specifically, the pixel data of the pixels P1 to P6 of the photographed image obtained by imaging in step 102 and the colorimetric data of the positions (colorimetry target positions) of the pixels P1 to P6 obtained by colorimetry in step 108. And a 3 × 3 color correction matrix as shown below is created so that the difference is minimized. This color correction matrix can be created using a so-called least square method.

However, R, G, and B are image data input as one pixel in the image, and X ′, Y ′, and Z ′ are corrected image data.

  Next, color correction processing executed after shooting by the digital camera 10 will be described with reference to a flowchart shown in FIG. Note that the color correction processing routine shown in the figure is executed when normal photographing is executed with the colorimetric switch 35 turned off. In the following description, it is assumed that the captured image data is stored in the memory 28.

  First, in step 200, it is determined whether or not the color correction matrix created by the above colorimetric processing is stored in the memory 28. If the color correction matrix is stored in the memory 28, the process proceeds to step 202. If the color correction matrix is not stored in the memory 28, the routine is terminated without executing the color correction process. .

  In step 202, the color correction matrix and photographed image data stored in the memory 28 are read, and in step 204, color correction is performed using this color correction matrix. That is, X ′, Y ′, and Z ′ image data obtained by color-correcting the captured image data of R, G, and B is obtained by the above equation (2).

  In step 206, the photographic image data after color correction is stored in the memory 28, and this routine is terminated.

  As described above, in the present embodiment, the colorimeter 42 capable of measuring the color with high accuracy is built in the camera, the reflection mirror 38 is provided, and the reflection mirror 38 is inclined so that any position within the photographing range can be obtained. Therefore, it is possible to obtain a photographed image with faithful color reproduction and easily obtain colorimetric data without a color chart. The convenience of the user can be improved without having to carry a color chart.

  In the present embodiment, the case where a normal subject is imaged to obtain colorimetric data has been described. However, a color chart 70 as shown in FIG. 8A is set in front of the lens 12, and this is imaged. Thus, the color measurement data may be acquired. The color chart 70 is printed with a plurality of color samples 70A, 70B,... Having different colors as shown in FIG. The color of each color sample is a color with known R, G, B color component values in the RGB color system and X, Y, Z color component values in the XYZ color system. The colors of the color samples printed on the color chart 70 include at least the colors on the peripheral side of the color space 60 so that a color correction matrix capable of faithfully reproducing the colors can be created. Is selected in a balanced manner.

  Further, in FIG. 4A, each color sample is circular, but the present invention is not limited to this, and as shown in FIG. 5B, each color sample printed in a rectangular shape may be used. Good. Furthermore, a known color chart called a Macbeth chart as shown in FIG. 9A may be used. This Macbeth chart is printed with color samples of 24 colors that need to be reproduced accurately at a minimum if the natural image is reproduced accurately. The known color chart is not limited to the Macbeth chart but may be a color chart using SHIPP (Standard High Precision Picture Data) as shown in FIG.

  In the present embodiment, the case where a color CCD is used as the CCD 22 has been described. However, as shown in FIGS. 10A and 10B, a monochrome (black and white) CCD 23 is used and rotated forward of the CCD 23, for example. The filter 82 may be provided. The rotary filter 82 employs a three-segment color wheel having R, G, and B color regions and is driven by a filter driving device 84. The rotary filter 82 is installed in the digital camera 10 so that the optical axis is located at a predetermined position (for example, the center) of each color region in the radial direction. Then, by rotating the rotary filter 82 around the center point O, it is possible to irradiate the CCD 23 with light of each color of R, G, and B.

  In this embodiment, the reflection mirror 38 is a total reflection mirror and is arranged at the predetermined position A during colorimetry and at the predetermined position B during normal subject photographing by the reflection mirror driving device 40. It is good also as a structure which is set as a half mirror and fixed to the predetermined position A. Thereby, the reflection mirror drive device 40 can be omitted, and the device can be configured easily and inexpensively.

  When the reflection mirror 38 is a half mirror, the optical path of the light transmitted through the reflection mirror 38 is slightly shifted depending on the inclination angle of the reflection mirror 38. For example, as shown in FIG. 11A, when the tilt angle of the reflection mirror 38 is θa, the distance d1 between the incident light R1 and the transmitted light R2 transmitted through the reflection mirror 38 is as shown in FIG. Further, when the inclination angle of the reflection mirror 38 is θb (θa> θb), it becomes smaller than the distance d2 between the incident light R1 and the transmitted light R2. That is, the position of the imaging point can be minutely changed by minutely changing the tilt angle of the reflection mirror 38. Accordingly, at least one of the rotation angles θ1 and θ2 of the reflection mirror 38 may be imaged a plurality of times while being gradually changed by a predetermined angle sequentially, and these image data may be combined. That is, so-called pixel shift may be performed. Thereby, acquisition of a high-resolution captured image can also be realized simultaneously by the present invention.

  When it is difficult to tilt the reflection mirror 38 with a motor, a small piezo actuator is provided on the reflection mirror 38, and the piezo actuator is controlled by the reflection mirror driving device 40 so that the reflection mirror 38 is minutely moved. You may comprise so that it may incline.

  Further, the CCD 22 may be configured to be movable in the direction of the arrow C1 and the direction of the arrow C2 in FIG. 2, and the CCD 22 may be imaged a plurality of times while sequentially shifting at a predetermined distance in at least one of the directions of the arrows C1 and C2. As a result, a high-resolution captured image can be acquired in the same manner as when the pixel shift is performed by changing the tilt angle of the reflection mirror 38.

  Further, in the present embodiment, as shown in FIG. 2, the case where the two-axis control in which the reflecting mirror 38 is inclined by rotating around the first axis E1 and the second axis E2 has been described. Not limited to this, single-axis control may be used. That is, as shown in FIG. 12, only the motor 40A that rotates about the first axis E1 is provided, and as shown in FIG. 13, the optical fiber 54A connected to the spectroscope 54 of the colorimeter 42. The tip (light incident end) is moved in the direction of arrow G in the figure by the linear slider 55. By moving the linear slider 55 in the direction of arrow G, the tip of the optical fiber 54A can be moved in the direction of arrow G. Therefore, the same effect as rotating the reflecting mirror 38 about the second axis E2 is achieved. Is obtained.

  Conversely, only the motor 40B that rotates about the second axis E2 is provided, and the tip of the optical fiber 54A is moved in a direction (perpendicular to the paper surface) perpendicular to the arrow G direction in FIG. It is good also as a structure to which it moves. Thus, by moving the linear slider 55 in the direction orthogonal to the arrow G direction, the tip of the optical fiber 54A can be moved in the direction orthogonal to the arrow G direction, so that the reflection mirror 38 is moved along the first axis E1. The same effect as rotating to the center can be obtained.

  In the present embodiment, the case where the present invention is applied to a digital camera has been described. However, as a digital camera, the present invention is also applied to other imaging devices such as a video camera as long as it captures a still image. Is possible.

It is a schematic block diagram of a digital camera. It is a figure for demonstrating tilting of a reflective mirror. It is a block diagram which shows schematic structure of a colorimeter. It is a figure for demonstrating about the color space of a color system. It is a flowchart of a colorimetry process. It is a flowchart of the process performed after imaging | photography. It is a figure for demonstrating the pixel of the colorimetric object position in color space. It is a figure which shows the example of a color chart. It is a figure which shows the example of a color chart. (A) is a schematic block diagram of the digital camera which concerns on a modification, (B) is a top view of a rotation filter. It is a figure for demonstrating pixel shift. It is a figure for demonstrating tilting of a reflective mirror. It is a partial schematic block diagram of the digital camera which concerns on a modification.

Explanation of symbols

10 Digital camera (color fidelity camera)
12 Lens 16 Lens driving device 18 Aperture driving device 20 Control unit (adjustment means, correction means)
22 CCD (imaging means)
24 Imaging signal processor 26 CCD drive device 28 Memory (storage means)
34 Mode setting switch 35 Color measurement switch 36 Shutter switch 38 Reflection mirror (reflection means)
40 Reflective mirror drive device (adjustment means, drive means)
40A motor (first rotating means)
40B motor (second rotating means)
42 Colorimeter (colorimetric means)
54 Colorimetric Sensor 56 A / D Converter 54 Spectrometer 54A Optical Fiber 55 Linear Slider 58 Converter 70 Color Chart

Claims (11)

Imaging means for imaging a subject;
A lens for imaging light from the subject on the imaging means;
Reflecting means for reflecting light from a color measurement target position selected from a plurality of color measurement target positions within an imaging range in a predetermined direction;
Colorimetric means for measuring the light reflected by the reflecting means and outputting the colorimetric data;
Between the imaging means and the lens and at any one of a first predetermined position on the optical path of light from the subject and a second predetermined position outside the optical path of light from the subject Driving means for driving the reflection means to be selectively disposed;
Adjusting means for adjusting an inclination angle of the reflecting means so that light from the selected colorimetric target position is incident on the colorimetric means;
Correction means for correcting image data of the subject imaged by the imaging means based on the colorimetric data;
Color fidelity camera with.   Selection for selecting a plurality of chromaticity pixel positions on the peripheral side of the visible light region on the chromaticity diagram as the colorimetric target positions from among the pixels of the colorimetric image captured for colorimetry by the imaging unit The color fidelity camera according to claim 1, further comprising means.   3. The color fidelity camera according to claim 2, wherein the color measurement image is an image obtained by capturing a color chart on which a plurality of color samples having different colors are printed.   The correction means includes a creation means for creating a color correction matrix based on the colorimetric data and image data of a colorimetric image imaged for colorimetry by the imaging means, and based on the color correction matrix, The color fidelity camera according to any one of claims 1 to 3, wherein image data of the subject imaged by the imaging unit is corrected.   The color fidelity camera according to claim 1, wherein the reflection unit is a total reflection mirror.   The apparatus further includes a storage unit that stores a correspondence relationship between the color measurement target position and tilt angle information regarding the tilt angle of the reflecting unit when light from the color measurement target position is incident on the color measurement unit. The color fidelity camera according to any one of claims 1 to 5, wherein the color fidelity camera is provided.   7. The color fidelity camera according to claim 6, wherein the tilt angle information is a rotation angle of the reflecting means corresponding to the tilt angle.   The adjustment means rotates the reflection means about a first rotation means for turning the reflection means about a predetermined first axis, and a second axis orthogonal to the first axis. 8. The color fidelity camera according to claim 1, further comprising: a second rotation unit that is moved.   The adjusting unit moves the color measuring unit in a longitudinal direction of a rotating unit that rotates the reflecting unit about a predetermined first axis and a second axis that is orthogonal to the first axis. The color fidelity camera according to claim 1, further comprising a moving unit.   The adjusting means tilts the reflecting means so that an imaging point position on the imaging means of light incident from the lens is slightly deviated in a predetermined direction at the time of photographing the subject while taking the image. The color fidelity camera according to any one of claims 1 to 9, wherein the unit is caused to image a plurality of times.   The color fidelity camera according to any one of claims 1 to 10, further comprising conversion means for converting the colorimetric data and the image data into a predetermined color system.