JP2012147334A - Crosstalk amount measurement device, color correction device using the same, and crosstalk amount measurement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crosstalk amount measurement device, a color correction device, and a crosstalk amount measurement method that are capable of simply and inexpensively measuring a crosstalk amount to an adjacent pixel in a solid-state image sensor.SOLUTION: Luminous flux carrying subject image information from a subject 31 is imaged on a light receiving surface of an image sensor 13 by an imaging lens 12, and is subjected to photoelectric conversion to generate an image signal. Thereafter, process processing is performed in a process circuit 14, and an MTF value is calculated in an MTF measurement unit 15 for the image signal of the subject 31. Though the calculated MTF value is input to a crosstalk amount calculation unit 16, in the crosstalk amount calculation unit 16, relation between an MTF value and a crosstalk amount is prestored in the format of a table (or a calculation formula), and a crosstalk amount of the image sensor 13 is calculated according to the MTF value input from the MTF measurement unit 15 using the table (or the calculation formula).

Description

The present invention relates to a crosstalk amount measuring apparatus that measures a crosstalk amount of a solid-state image sensor, a color correction device using the same, and a crosstalk amount measuring method, and more particularly to a crosstalk to adjacent pixels of a solid-state image sensor. The present invention relates to an apparatus for measuring quantities.

  In recent years, there has been a strong demand for reduction in crosstalk in a solid-state imaging device such as a CMOS or a CCD with an increase in display image quality.

  In such a solid-state imaging device, particularly a CMOS, crosstalk in which a signal leaks to an adjacent pixel is likely to occur. The main causes are that incident light that has passed through a position on an adjacent pixel is optically mixed, and that photoelectrons generated inside the silicon substrate are diffused into an adjacent pixel and electrically mixed.

  When crosstalk occurs, in a single-plate color solid-state image sensor in which a color filter is mounted on each pixel of the solid-state image sensor, the colors of the color filters differ between adjacent pixels, so adjacent pixels for different colors A color mixing phenomenon in which colors are mixed with each other occurs and color reproducibility is deteriorated.

  In the silicon single crystal to which the photoelectric conversion is performed, the irradiated light is absorbed in the crystal at a different depth for each wavelength (Table 1 (light color and absorption depth “CCD / CMOS image sensor See "Basics and Applications"). Therefore, for example, when the thickness of the depletion layer is 2 μm, blue and green light having a short wavelength is photoelectrically converted in the depletion layer, and photoelectrons are collected in the N region by drift due to a potential gradient. There is a possibility that photoelectric conversion is performed outside and photoelectrons are mixed into adjacent photodiodes due to diffusion.

In the simulation example of Furumiya et al. (Described in Non-Patent Document 1 below), purple light (400 nm) having a short wavelength hardly leaks to adjacent pixels, but red light (700 nm) having a long wavelength leaks to adjacent pixels. It is reported to come.
Also in the Mutoh simulation example (described in Non-Patent Document 2 below), it is reported that the amount of crosstalk to adjacent pixels changes according to the wavelength of incident light.

However, Non-Patent Documents 1 and 2 below do not include any description or suggestion of simply measuring the amount of crosstalk to adjacent pixels using, for example, MTF.
On the other hand, in Patent Document 3 below, a measurement result of a crosstalk amount performed using a spot light measurement device and an image sensor having a large pixel size is described in relation to MTF.

“High-Sensitivityand No-Crosstalk Pixel Technology for Embedded CMOS Image Sensor”, M. Furumiya et. Al, IEEETransactions on Electron Devices, Volume: 48 Issue: 10, pp.2221-2227, (2001) “3-D Optical and Electrical Simulation for CMOS Image Sensors”, H. Mutoh, IEEETransactions on Electron Devices, Volume: 50 Issue: 1, On page (s): 19-25 (2003) “Pixel Crosstalk and Correlation with Modulation Transfer Function of CMOS Image Sensor”, M. Estribeau et. Al, SPIE Electronic Imaging, Sensors and CameraSystems for Scientific and Industrial Applications VI Volume: 5677 Page: 98-108 Publication: 2005

  However, Non-Patent Document 3 only describes the result of actual measurement using a spot light measurement device and an image sensor having a large pixel size. Also, the device itself used is special and very expensive. Furthermore, in general, in a spot light measurement device, measurement of an image sensor with a small pixel size is accompanied by difficulty in reducing the light beam spot, and the moving stage that moves the image sensor as the object to be measured must be accurately controlled. Is not easy.

  In Non-Patent Document 3, horizontal and vertical MTF characteristics are measured with respect to light of 500 nm to 800 nm, and a spatial low pass filter (LPF) effect is brought about by leakage of charges to adjacent pixels due to scattering. It has been reported that the MTF decreases and the relationship between the MTF value at the Nyquist frequency and the amount of crosstalk is approximately proportional. However, this document only shows experimental measurement results, and no suggestion is made as to how to analyze and apply such a phenomenon.

  The present invention has been made in view of such circumstances, and first, to provide a crosstalk amount measuring apparatus capable of easily and inexpensively measuring the amount of crosstalk to adjacent pixels of a solid-state imaging device, Another object of the present invention is to provide a color correction device and a crosstalk amount measuring method using the crosstalk amount measuring device.

The crosstalk amount measuring apparatus of the present invention is
In a crosstalk amount measuring apparatus that measures the amount of crosstalk of a solid-state imaging device that images a subject,
An MTF measurement unit that measures MTF characteristics based on the output from the solid-state imaging device;
A crosstalk amount calculation unit that stores a relationship between an MTF value and a crosstalk amount in advance and calculates the crosstalk amount based on an MTF value from the MTF measurement unit;
It is characterized by comprising.

  Moreover, it is preferable that the relationship between the MTF value and the crosstalk amount stored in the crosstalk amount calculation unit is obtained based on data acquired using an MTF measurement chart as a subject.

  The solid-state imaging device is preferably an image sensor having sensitivity at least over the entire visible light region.

  Further, the color correction device of the present invention stores the association between the crosstalk amount measuring device, the crosstalk amount and a color correction value capable of compensating for the crosstalk amount, and carries input image information of the subject. A color correction value calculation unit that calculates a color correction value that can correct a color mixture based on the crosstalk amount of the image data from the crosstalk amount measurement apparatus from the crosstalk amount measurement device, and the information on the crosstalk amount A color correction unit that performs color correction of a subject image received by the solid-state imaging device based on a color correction value output from the color correction value calculation unit in response to an input to the color correction value calculation unit. It is characterized by this.

Further, the crosstalk amount measuring method of the present invention is a method for measuring the crosstalk amount of a solid-state imaging device that images a subject.
The crosstalk amount is obtained from the measured MTF value of the image of the subject based on the relationship between the MTF value and the crosstalk amount stored in the memory in advance.
The relationship between the MTF value and the amount of crosstalk is obtained by subtracting the MTF characteristic depending on the lens shape and the MTF characteristic due to the aperture effect in the pixel aperture from the MTF characteristic obtained by imaging the subject. To do.

  In the specification of the present application, the term “MTF” is used for both a case of evaluating a system in which each member of an imaging lens and a solid-state imaging device (image sensor) is combined, and a case of evaluating each member. Shall be used.

  According to the crosstalk amount measuring apparatus of the present invention, the MTF measurement unit measures the MTF characteristics based on the output from the solid-state imaging device, and then the crosstalk amount calculation unit calculates the crosstalk from the measured MTF value. The amount of crosstalk of the solid-state imaging device is calculated by estimating the amount of crosstalk from the measured MTF value without measuring the amount of crosstalk itself of the solid-state imaging device. It can be calculated by a simple and inexpensive device.

  Further, according to the color correction device of the present invention, when the output value from the crosstalk amount measurement device is input to the color correction value calculation unit, based on the color correction value output from the color correction value calculation unit, Since color correction of the subject image received by the solid-state imaging device is performed, even if crosstalk occurs between adjacent pixels and color mixing occurs, simple and inexpensive color correction of the subject image can be performed. .

  Furthermore, according to the crosstalk amount measuring method of the present invention, the crosstalk amount is obtained from the measured MTF value of the subject based on the relationship between the MTF value and the crosstalk amount stored in advance in the memory. Further, the relationship between the MTF value and the crosstalk amount is obtained by subtracting the MTF characteristic depending on the lens shape and the MTF characteristic due to the aperture effect in the pixel aperture from the MTF characteristic obtained by imaging the subject. Therefore, the measurement process can be performed easily and inexpensively.

It is the schematic which shows the crosstalk amount measuring apparatus which concerns on embodiment of this invention. FIG. 4 is a diagram modeling a crosstalk phenomenon of charge accumulated in a pixel. It is a graph which shows the change of the MTF characteristic by the LPF effect according to the amount of crosstalk. It is a graph which shows the change of the MTF characteristic by the diffraction effect of an imaging lens. It is a graph which shows the change of the MTF characteristic by the pixel aperture ratio of a solid-state image sensor. It is a graph which shows the change of the MTF characteristic of the whole system. It is a graph which shows the relationship between the amount of crosstalk in a Nyquist frequency, and MTF. It is the schematic which shows the color correction apparatus which concerns on embodiment of this invention.

  Hereinafter, a crosstalk amount measuring apparatus and a crosstalk amount measuring method according to embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic diagram showing a crosstalk amount measuring apparatus 10 according to this embodiment mounted on an imaging apparatus such as a camera. The imaging lens 12 converges a light beam from a subject 31, and the imaging lens 12 A single-plate image sensor 13 such as a CMOS (or CCD) that receives the converged light beam, a process circuit 14 for performing a process of signal output from the single-plate image sensor 13, and an output from the process circuit 14 The MTF measurement unit 15 that measures the MTF characteristics, and the relationship between the MTF value and the crosstalk amount is stored in advance, and the crosstalk amount calculation that calculates the crosstalk amount from the MTF value measured by the MTF measurement unit 15 A portion 16 is provided. Note that the MTF measurement unit 15 and the crosstalk amount calculation unit 16 are generally configured by a combination of hardware such as a CPU in a personal computer and software stored in a ROM or the like.

  By the way, information related to the relationship between the MTF value and the crosstalk amount stored in advance in the crosstalk amount calculation unit 16 is set as follows when the apparatus is manufactured.

  That is, first, an image of a test chart (a chart used for MTF measurement such as an Inmega chart (or a slanted edge chart)) 11 is formed on the light receiving surface of the image sensor 13 by the imaging lens 12. The image signal of the chart 11 that has been photoelectrically converted by the image sensor 13 and converted into an electrical signal is processed in the process circuit 14. Next, the MTF measurement unit 15 calculates the MTF value for the image signal of the chart 11 that has been subjected to the process processing. The calculated MTF value is input to the crosstalk amount calculation unit 16. In the crosstalk amount calculation unit 16, the relationship between the measured MTF value and the crosstalk amount is associated by a table (or a calculation formula). It will be stored in the state. For the measurement of the amount of crosstalk for creating this table (or calculation formula), for example, a method similar to the description relating to FIG. 8 in Japanese Patent Application Laid-Open No. 2006-121164 can be adopted.

  After the above relationship is set in this way, in actual measurement, an image of the subject 31 is formed on the light receiving surface of the image sensor 13 by the imaging lens 12. The image signal of the subject 31 that has been photoelectrically converted by the image sensor 13 and converted into an electrical signal is input to the MTF measurement unit 15 via the process circuit 14 and an MTF value is calculated. The calculated MTF value is input to the crosstalk amount calculation unit 16, and the input MTF is input based on the relationship between the MTF value and the crosstalk amount associated by the table (or calculation formula) set as described above. The crosstalk amount is calculated from the value.

  As the chart 11 used at the time of manufacturing the apparatus, as described above, a slanted edge chart or the like can be used in addition to the Inmega chart, but the occurrence of chromatic aberration due to crosstalk is a serious problem. As the chart 11, it is preferable to use a chart that can perform color correction such as a color mega chart so that it can be measured by light of various wavelengths.

  The MTF measurement method may be a method based on a resolution measurement method based on, for example, ISO12233. That is, it is possible to use a well-known method such as imaging the chart 11, obtaining an impulse response from the step response of the signal from the image sensor 13, performing Fourier transform on the impulse response, and obtaining the MTF.

  In the present embodiment device, since it is configured as described above, incident light that has passed through a position on an adjacent pixel is optically mixed, and photoelectrons generated inside a silicon substrate are adjacent to each other. The crosstalk amount can be calculated easily and accurately in any case where the signal is diffused and electrically mixed. In particular, if the chart 11 used at the time of manufacturing the apparatus is a color inmega chart and the image sensor 13 is capable of imaging light over at least the entire visible light region, the crosstalk amount and MTF value that cause color mixing are used. Can be grasped easily and accurately.

As is clear from the above description, the present invention is based on the knowledge that the magnitude of the crosstalk affects the magnitude of the MTF value (M. Estribeau et. Al, “Pixel Crosstalk and Correlation with Modulation Transfer Function of CMOS Image Sensor ”).
Therefore, how the relationship between the MTF value and the crosstalk amount stored in the crosstalk amount calculation unit 16 is obtained when the apparatus is manufactured will be described in detail.

  First, the crosstalk model of the charge accumulated in the pixel is set as shown in FIG. That is, the incident light amounts in the five pixels 17A to 17E arranged in a row are sequentially set to x (n-2), x (n-1), x (n), x (n + 1), x (n + 2), Leakage rate from each pixel to adjacent pixels, where the amount of emitted light is x ′ (n−2), x ′ (n−1), x ′ (n), x ′ (n + 1), and x ′ (n + 2) in order. If k is k, the readout signal y (n) from the pixel 17C is expressed by the following equation (1).

y (n) = α {k * x ′ (n−1) + (1-2k) * x ′ (n) + k * x ′ (n + 1)}
...... (1)

That is, the relationship between the spatial frequencies of the input / output signals is expressed by the following equation (2).
H (z) = k + (1-2k) z ⁻¹ + kz ⁻² (2)

  This can be considered that the system shown in FIG. 2 is a {k, (1-2k), k} low-pass filter (LPF). The k is set to 0.1, for example.

  Next, the MTF characteristic due to the LPF effect of the system of FIG. 2 is represented by the graph of FIG. The horizontal axis represents TVL (television book), and the vertical axis represents MTF (the same applies to FIGS. 4, 5 and 6). This decrease in MTF characteristics is caused only by the crosstalk LPF effect.

  On the other hand, the MTF characteristics due to the diffraction of the ideal lens (showing the calculation results when the wavelengths are 460, 530, and 700 nm) and the MTF characteristics when the pixel aperture ratio is 82% in the horizontal direction are shown in FIGS. This is represented by the graph. 4 and 5 is not directly related to the change in the amount of crosstalk, and the decrease in MTF characteristic shown in FIG. 4 depends on the lens shape. The decrease in the MTF characteristics shown in FIG. 5 is due to the aperture effect in the pixel aperture.

  The total MTF characteristics shown in FIG. 3, FIG. 4, and FIG. 5 are the total MTF characteristics shown in FIG. 6 (in the case of a wavelength of 530 nm) and correspond to the MTF characteristics of the mode actually measured. .

  Note that the maximum value of TVL is 2160 lines, which is 1/2 of the number of scanning lines for Super Hi-Vision 4320 lines.

  As described above, the total MTF characteristics shown in FIG. 6 are obtained by combining the respective MTF characteristics. Actually, the various MTF characteristics are superimposed in this manner (multiplied form), and thus the measured MTF is measured. In order to obtain the MTF characteristic reflecting only the crosstalk LPF effect from the characteristic, the total MTF characteristic as shown in FIG. 6 is changed to the MTF characteristic depending on the lens shape as shown in FIG. 4 and FIG. By dividing by the MTF characteristic due to the aperture effect in such a pixel aperture, it is possible to obtain the MTF characteristic reflecting only the crosstalk LPF effect as shown in FIG.

The MTF characteristic (MTF _dif (μ)) due to the diffraction effect of the ideal lens shown in FIG. 4 is expressed by the following conditional expression (3).

Further, the MTF characteristic (MTF _apt (μ)) due to the aperture effect in the pixel aperture shown in FIG. 5 is expressed by the following conditional expression (4).

Therefore, the _total MTF characteristic (MTF _total (μ)) shown in FIG. 6 is expressed by the following conditional expression (5).
MTF _total (μ) = MTF _dif (μ) x MTF _apt (μ) x MTF _lpf (μ) (5)

Strictly speaking, since it is necessary to add the MTF characteristic (MTF _lens (μ)) of the actual lens itself among the various MTF characteristics, the actual total MTF characteristic (MTF _total (μ)) is The following conditional expression (6) is preferable.
MTF _total (μ) = MTF _dif (μ) x MTF _apt (μ) x MTF _lens (μ) x MTF _lpf (μ)
...... (6)

Therefore, using the conditional expression (5) or the conditional expression (6), the MTF characteristic (MTF _total (μ)) obtained by the measurement is calculated backward to reflect only the crosstalk LPF effect ( MTF _lpf (μ)) is obtained.

As for the MTF _lens (μ), the result of separately measuring the lens may be used. Further, the MTF characteristic (MTF _lpf (μ)) reflecting the LPF effect of crosstalk is expressed by the following conditional expression (7).

  From the MTF characteristics reflecting only the crosstalk LPF effect obtained in this way, at a predetermined frequency, for example, the Nyquist frequency (equivalent to TVL = 2160), the MTF value and the amount of crosstalk (%) By extracting the relationship and storing it in the calculation unit 16 in the form of a table or an approximate expression, the crosstalk amount is output from the crosstalk amount calculation unit 16 based on the input of the MTF value from the MTF measurement unit 15. be able to.

  Hereinafter, specific details of the arithmetic processing in the crosstalk amount calculation unit 16 will be added.

  FIG. 7 shows the MTF values plotted at the Nyquist frequency (corresponding to TVL = 2160) in FIG. 6 by the amount of crosstalk (in each case at wavelengths λ = 460, 530, and 700 nm). Table 2 shows representative numerical values (when CT = 0% and CT = 10%).

  As is clear from Table 2, when the crosstalk amount increases from 0% to 10%, the MTF decreases by 0.13 to 0.18 points in relative value according to the change in color (wavelength of light), When the crosstalk amount is 0%, the amount of change in MTF corresponding to the change in color (light wavelength) is larger than when the crosstalk amount is 10%. Accordingly, it is possible to estimate and measure the crosstalk amount by measuring the MTF value at the highest possible frequency such as the Nyquist frequency.

  Furthermore, by using the measured crosstalk amount data, the crosstalk amount can be estimated and measured based on the relative value of the change amount of the MTF that changes according to the change of the color (light wavelength). As a result, the crosstalk amount can be estimated without being affected by the lens.

Next, the color correction apparatus 20 according to the embodiment of the present invention will be described with reference to the drawings.
FIG. 8 is a schematic diagram showing the color correction device 20 according to the present embodiment, and the crosstalk amount output from the crosstalk amount measuring device 10 and the crosstalk amount measuring device 10 and the color that can compensate for the crosstalk amount. The color correction value calculation unit 21 in which the association with the correction value is stored in advance, and the color correction value calculation when the output value from the crosstalk amount measuring apparatus 10 is input to the color correction value calculation unit 21 Based on the color correction value output from the unit 21, a color correction unit 22 that performs color correction of the subject image received by the image sensor 13 ′ and input through the process circuit is provided. Note that the color correction value calculation unit 21 and the color correction unit 22 are generally configured by a combination of hardware such as a CPU in a personal computer and software stored in a ROM or the like.

  In this case, the chart 11 used in the crosstalk amount measuring apparatus 10 is a color inmega chart at the time of manufacturing the apparatus, and the image sensor 13 used in the crosstalk amount measuring apparatus 10 is at least visible light. It is important to use one having sensitivity in the wavelength range over the entire region.

Information relating to the relationship between the color correction value and the crosstalk amount is set as follows.
That is, at the time of manufacturing the device, the crosstalk amount information obtained by using the chart 11 from the crosstalk amount measuring apparatus 10 is input to the color correction value calculation unit 21, and the crosstalk amount and the crosstalk amount are calculated. The relationship with the color correction value that can compensate for the generated color mixture is stored in a state associated with a table (or calculation formula). For the measurement of the amount of crosstalk for creating this table (or calculation formula), for example, a method similar to the description according to Patent Document 1 can be adopted.

  Further, the color correction value calculation unit 21 obtains an MTF value by measurement or calculation for each crosstalk amount, and based on the obtained crosstalk amount, a crosstalk component (from the image signal output from the image sensor 13). A correction coefficient that reduces the color mixture component and corrects the color of the image signal is stored in the color correction value calculation unit 21 as a table, for example. The calculation for determining the correction coefficient is performed by, for example, an external calculation unit, or by providing a calculation unit such as a crosstalk correction coefficient determination unit in the memory for data storage.

  On the other hand, in the actual measurement, the measurement information of the crosstalk amount of the subject 31 output from the crosstalk amount measuring apparatus 10 is input to the color correction value calculation unit 21, and the color correction value calculation unit 21 Based on the table (or calculation formula) set as described above, the relationship between the crosstalk amount and the color correction value that can compensate for the color mixture generated by the crosstalk amount is determined based on the input crosstalk amount. A correction value is calculated.

  The color correction value data output from the color correction value calculation unit 21 is input to the color correction unit 22. In the color correction unit 22, when an image of the subject 31 captured by the image sensor 13 ′ is input via the imaging lens 12 ′, color correction based on the color correction value is performed on the image of the subject 31. As a result, the color mixture generated in response to the crosstalk is improved.

  More specifically, a CDS / AGC circuit (not shown) including a CDS (Correlate Double Sampling) circuit and an AGC [Automatic Gain Control] circuit is connected to the output side of the image sensor 13. The CDS / AGC circuit extracts an image signal component from the analog sample value signal, amplifies it, and outputs it. Further, an A / D converter is connected to the output side of the CDS / AGC circuit.

  Connected to the output side of the A / D converter is a digital signal processing means for inputting the digital data image signal and performing so-called video process processing. The digital signal processing means includes, for example, a color signal processing circuit (color separation, RGB matrix, γ correction circuit, etc.), a luminance signal processing circuit (Y filter, enhancer, γ correction circuit, etc.), signal processing circuit ( NTSC / PAL color modulation, a circuit for performing encoder processing for adding synchronization, etc.), a synchronization signal generating circuit (such as a circuit for supplying a synchronizing signal to the signal processing circuit and the external timing generator), and an interface circuit for an external microcomputer (A circuit for inputting / outputting image information and parameters to / from an external microcomputer), and the color correction value calculation unit 21 and the color correction unit 22.

  In this color correction device 20, the imaging lens 12 'and the image sensor 13' used when imaging an actual subject are the same as the imaging lens 12 and the image sensor 13 used for obtaining the color correction value. It is preferable to use one.

  Note that the crosstalk amount measuring apparatus and the color correction apparatus using the same according to the present invention are not limited to those of the above-described embodiment, and various other modifications can be made. For example, in the above-described embodiment, the color inmega chart is used as the MTF measurement chart, but other color charts may be used, and color correction is not so problematic. For this, a chart such as a black and white Inmega chart may be used.

  In the above embodiment, as a model of MTF reduction due to photoelectron diffusion, the readout signal is a signal obtained by adding the own pixel signal and the leakage signal from the adjacent pixel, and the relative spatial frequency of the input and output signals The estimation processing is performed assuming that the relationship is an LPF composed of a plurality of adjacent pixel signals, and the number of the plurality of pixels is three. However, for example, five or nine can be used, It is possible to use a plurality of numbers other than.

  Further, in the above embodiment, a single plate type CMOS is used. However, the apparatus of the present invention can be similarly applied to a single plate type CCD, and it is not excluded to use a three plate type CMOS or CCD. Absent.

DESCRIPTION OF SYMBOLS 10 Crosstalk amount measuring apparatus 11 Chart 12, 12 'Imaging lens 13, 13' Image sensor 14, 14 'Process circuit 15 MTF measuring part 16 Crosstalk amount calculating part 17A-E Pixel 20 Color correction apparatus 21 Color correction value calculating part 22 Color correction unit 31 Subject

Claims (5)

In a crosstalk amount measuring apparatus that measures the amount of crosstalk of a solid-state imaging device that images a subject,
An MTF measurement unit that measures MTF characteristics based on the output from the solid-state imaging device;
A crosstalk amount calculating unit that stores a relationship between an MTF value and a crosstalk amount in advance and calculates the crosstalk amount based on an MTF value from the MTF measuring unit;
An apparatus for measuring the amount of crosstalk, comprising:   2. The relationship between the MTF value and the crosstalk amount stored in the crosstalk amount calculation unit is obtained based on data acquired using an MTF measurement chart as a subject. The crosstalk amount measuring device described.   The crosstalk amount measuring apparatus according to claim 1, wherein the solid-state imaging device is an image sensor having sensitivity in at least a visible light region. An association between the crosstalk amount measuring apparatus according to any one of claims 1 to 3, a crosstalk amount and a color correction value capable of compensating for the crosstalk amount is stored in advance, and input image information of a subject is stored. A color correction value calculation unit that calculates a color correction value that can correct color mixing based on the crosstalk amount of the image data from the crosstalk amount measurement apparatus from the crosstalk amount measurement device, and information on the crosstalk amount A color correction unit that performs color correction of a subject image received by the solid-state imaging device based on a color correction value output from the color correction value calculation unit in response to an input to the color correction value calculation unit;
A color correction apparatus comprising: In a crosstalk amount measuring method for measuring a crosstalk amount of a solid-state imaging device that images a subject,
The crosstalk amount is obtained from the measured MTF value of the image of the subject based on the relationship between the MTF value and the crosstalk amount stored in the memory in advance.
The relationship between the MTF value and the amount of crosstalk is obtained by subtracting the MTF characteristic depending on the lens shape and the MTF characteristic due to the aperture effect in the pixel aperture from the MTF characteristic obtained by imaging the subject. To measure the amount of crosstalk.

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