JP2014121028A - Imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging apparatus which achieves day/night determination by suppressing influence of disturbance and can perform more stable operation at a night mode.SOLUTION: An imaging apparatus includes: generation means 21 for generating a luminance signal from a signal of an imaging element 20; sensitivity adjusting means 12 for adjusting imaging sensitivity in accordance with photographing environment; disturbance information acquiring means 23a; evaluation weight storage means 23b; evaluation weight correction means 23c; and evaluation value generation means 23d. The disturbance information acquiring means acquires disturbance information by using exposed data by the luminance signal whose sensitivity is adjusted by the sensitivity adjusting means. The evaluation weight storage means stores evaluation weight for evaluating the exposed data. The evaluation weight correction means corrects the evaluation weight with the disturbance information. The evaluation value generation means generates an evaluation value by using the corrected evaluation weight and exposed data. The sensitivity adjusting means is switched between a state where it is adjusted for photographing under high illuminance environment and a state where the means is adjusted for photographing under low illuminance environment with the evaluation value from the evaluation value generation means.

Description

The present invention controls an image sensor sensitivity adjusting means such as an infrared cut filter incorporated so as to be insertable / removable in front of the image sensor, and adjusts the amount of received infrared light component to the image sensor, etc. It is related with the imaging device which can adjust exposure data according to.

Surveillance cameras include devices that have a night mode function that eliminates color information and increases light receiving sensitivity for night shooting, which is shooting in a low-light environment with relatively low illuminance. The light reflected by the subject passes through the focusing lens, the variable power lens, and the aperture in order, and the infrared light component is removed by the infrared cut filter and reaches the solid-state image sensor (CCD or CMOS sensor). Is converted to The converted electric charge is converted into a signal through the correlated double sampling circuit and input to the video processing circuit, and the video processing circuit generates a luminance signal from the input signal.

The purpose of removing the infrared rays is to prevent the solid-state imaging device from receiving light that cannot be detected by the human eye, so that the red component having a frequency band close to that of the infrared rays is not excessively increased. Conversely, if the user does not care about the color balance, the amount of light can be supplemented with an infrared light component that cannot be detected by the human eye. The state in which the infrared cut filter is removed with priority given to the amount of light is referred to as night mode (night shooting mode in which shooting is performed in a low-light environment with relatively low illuminance). A state in which the infrared cut filter is attached is referred to as a day mode (a daytime shooting mode in which shooting is performed under a relatively high illuminance environment). Some imaging devices that place importance on night photography, such as surveillance cameras, have an automatic switching function between day mode and night mode.

The problem with this automatic switching is, for example, a misjudgment such as shifting to the day mode when there is a disturbance such as a headlight of an automobile during night mode shooting during outdoor night monitoring. In the prior art, in the switching determination, a determination is made by providing a luminance threshold value and a luminance stabilization time, thereby reducing erroneous determination. However, when the disturbance luminance is large, it is necessary to increase the luminance threshold, and there is a problem that switching between the day mode and the night mode becomes slow. As a solution to this problem, in Patent Document 1, when a specific area in a captured image is masked with a rectangle or the like, the image signal of the mask target area is excluded from detection targets so as not to affect processing such as focus and exposure. A method is disclosed.

JP 2003-259189 A

However, in the technique of Patent Document 1, it is necessary for the operator of the apparatus to determine and set the presence or absence of disturbance, and it cannot be easily installed. An object of the present invention is to provide an imaging apparatus that can suppress the influence of disturbance and can further stabilize automatic switching between a day mode (shooting mode in a high illumination environment) and a night mode (shooting mode in a low illumination environment). There is.

In order to achieve the above object, an imaging apparatus according to the present invention includes an imaging device, a luminance signal generation unit that generates a luminance signal from a signal output from the imaging device, and a color balance of the luminance signal according to a shooting environment. Adjustment means for adjusting the imaging sensitivity by changing the sensitivity, disturbance information acquisition means for acquiring disturbance information using exposure data based on the luminance signal whose sensitivity is adjusted by the sensitivity adjustment means, and evaluation weights for evaluating the exposure data Evaluation weight storage means for storing, evaluation weight correction means for correcting the evaluation weight using the disturbance information, evaluation value generation means for generating an evaluation value using the corrected evaluation weight and the exposure data, And using the evaluation value from the evaluation value generation means, the state of the sensitivity adjustment means is adjusted for shooting in a high illumination environment and for shooting in a low illumination environment Wherein the switching between the state.

ADVANTAGE OF THE INVENTION According to this invention, the day / night determination which remove | eliminated or suppressed the influence of the disturbance is attained, and the imaging device which can operate more stably in night mode can be provided. Further functions / effects or other features of the present invention will be made clear by the embodiments described below with reference to the accompanying drawings.

1 is a block diagram illustrating a configuration of an imaging device. The flowchart which shows the basic algorithm of mode switching. The flowchart which acquires a day evaluation value. The flowchart of day mode decision. The flowchart of decision mode decision at the time of a day. The flowchart which acquires a knight evaluation value. The flowchart of night mode decision. The flowchart of determination mode decision at night. The flowchart which shows an infrared consideration type | mold mode switching algorithm. The flowchart which acquires a day evaluation value. The flowchart of day mode decision. The flowchart of decision mode decision at the time of a day. The flowchart which acquires a knight evaluation value. The flowchart of night mode decision. The flowchart of determination mode decision at night.

The image pickup apparatus of the present invention has sensitivity adjustment means for adjusting the image pickup sensitivity by changing the color balance of the luminance signal according to the shooting environment. Then, using the evaluation value of the exposure data generated using the evaluation weight modified in consideration of disturbance, the state of the sensitivity adjustment unit is adjusted to the state adjusted for shooting in the high illumination environment and the low illumination environment. Switch between the states adjusted for shooting below. Therefore, day / night determination can be performed with the influence of disturbance removed or suppressed.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
Example 1
With reference to FIG. 1, a description will be given of a method for removing a disturbance during day / night determination according to a first embodiment of the present invention. The light emitted from the subject passes through the condenser lens 10, the light flux is limited by the diaphragm mechanism 11, and forms an image on the image sensor 20 through the infrared cut filter 12 constituting the sensitivity adjustment unit. The image sensor 20 converts light into electric charge by the photoelectric effect and accumulates it. The accumulated charges are amplified and quantized and output to the video processing circuit 21 as a digital signal. A luminance signal is output from the video processing circuit 21 which is a luminance signal generating means for generating a luminance signal from a signal output from the image sensor, and is output to the exposure control circuit 22. By controlling the infrared cut filter 12, the color balance of the luminance signal is changed according to the shooting environment, and the imaging sensitivity is adjusted.

The exposure control circuit 22 controls the exposure state so that the luminance signal output from the video processing circuit 21 becomes a certain level by using the charge accumulation and amplification circuit of the diaphragm mechanism 11 and the image sensor 20. The day / night determination circuit 23 uses the exposure data generated by the exposure control circuit 22 to control the infrared cut filter 12 according to a basic algorithm for day / night determination described in FIG.

In FIG. 2, the day / night determination circuit 23 first inserts the infrared cut filter 12 into the optical path in step 110 when the power is turned on. Subsequently, in step 120, day-state exposure data is acquired from the exposure control circuit 22, and a day evaluation value is calculated. The calculated day evaluation value is compared with a threshold value for shifting to the night mode in step 130. If the evaluation value is greater than the threshold value, the process branches to step 140 and the day mode is determined. After the day mode is determined, the process returns to step 120 again to enter a loop for obtaining the day evaluation value. If the evaluation value is smaller than the threshold value for shifting to the night mode in step 130, the process branches to step 160 and shifts to the determination mode 160. In the determination mode, the infrared cut filter 12 is extracted from the optical path in step 210, and the night mode determination is started.

Next, in step 220, as in step 120, the night evaluation value is calculated from the exposure data of the exposure control circuit 22 to which the luminance signal is input. In step 230, the calculated night evaluation value is compared with a threshold value for shifting to the day mode. If the evaluation value is smaller than the threshold value, the process branches to step 240, and if the day evaluation value is stored, it is deleted and the night mode is determined. After the night mode is confirmed, the process returns to step 220 again to enter a loop for obtaining the night evaluation value. If the evaluation value is larger than the threshold value for shifting to the date mode in step 230, the process branches to step 260 and shifts to the determination mode. In the determination mode, the infrared cut filter 12 is inserted again in step 110, and the day mode determination is started.

The day evaluation value calculation in step 120 is processed according to the flow described in FIG. First, at step 121, exposure data is acquired from the exposure control circuit 22. The exposure data is a set of data of each pixel of the image sensor or a set of average data of pixels in each area divided in a grid pattern. That is, here, the exposure data has a grid-like data array. In step 122, the presence / absence of night exposure data is determined. If there is, the process proceeds to a direction in which the evaluation weight in step 123 is changed, and if not, the process proceeds to a direction in which the evaluation weight in step 129 is not changed. The presence of night exposure data means that the process has shifted from step 260. On the other hand, the absence of night exposure data means that the process has shifted from step 140. In step 123, the night exposure data stored in step 260 is read. In the following step 124, difference data between the exposure data acquired in step 121 and the night exposure data read out in step 123 is obtained. The difference data may be a grid-like data array corresponding to the data array of exposure data, or may be data that is a sum of all elements of the data array.

In step 127, the difference data is referred to the disturbance coefficient conversion table of the difference value to obtain a disturbance coefficient (disturbance information) that becomes the evaluation weight operation rate (in other words, the rate at which the evaluation weight is reduced). This is executed by the disturbance information acquisition means 23a of the day / night determination circuit 23 shown in FIG. The disturbance coefficient conversion table of the difference value is created in advance by performing measurement or simulation and stored in the storage unit. As a general tendency, the disturbance coefficient takes a value that increases the disturbance existence probability as the absolute value of the difference value increases. In step 128, the evaluation weight is changed by multiplying the current evaluation weight stored in the evaluation weight storage means 23b by the disturbance coefficient. The initial value of the evaluation weight stored first in the evaluation weight storage means 23b is, for example, 1. The evaluation weight is changed by the evaluation weight correction means 23c of the day / night determination circuit 23 shown in FIG. In step 129, the day evaluation value is obtained by taking a weighted average of the exposure data and the evaluation weight (the evaluation weight is also a grid-like data array corresponding to the exposure data). To get. This is executed by the evaluation value generation means 23d that generates an evaluation value using the corrected evaluation weight and exposure data. Using the evaluation value in consideration of such disturbance, the state of the sensitivity adjustment means is switched between a state adjusted for shooting in a high illumination environment and a state adjusted for shooting in a low illumination environment. In addition, it is possible to perform day / night determination with the influence of disturbance removed or suppressed. There is also a method of calculating the disturbance coefficient in step 127 by calculation. In addition, there is a method in which step 127 stores the difference data obtained in step 124 and is executed only when the maximum value of the difference data is updated, and the evaluation weight is changed in step 128. There is also a method in which the evaluation weight change in step 128 is realized by subtraction of a disturbance coefficient.

The confirmation of the day mode in step 140 is processed according to the flow described in FIG. In step 141, the presence / absence of night exposure data is determined. If there is night exposure data, the process proceeds to step 149 to erase the night exposure data. This night exposure data is stored in the first storage means (not shown) of the day / night determination circuit 23. The night exposure data stored in the first storage means is erased by the second erase means (not shown) of the day / night determination circuit 23. Determination of the determination mode in step 160 is processed according to the flow described in FIG. In step 162, exposure data is acquired from the exposure control circuit 22, and in step 163, day exposure data is stored. There is also a method of using the exposure data acquired in step 121 for acquiring the exposure data in step 162. This day exposure data is stored in the second storage means (not shown) of the day / night determination circuit 23.

The night evaluation value calculation in step 220 is processed according to the flow described in FIG. First, at step 221, exposure data is acquired from the exposure control circuit 22. In step 222, the presence / absence of night exposure data is determined. If there is, the process proceeds to a direction in which the evaluation weight in step 223 is changed, and if not, the process proceeds to a direction in which the evaluation weight in step 229 is not changed. In step 223, the day exposure data stored in step 160 is read. In the following step 224, difference data between the exposure data acquired in step 221 and the day exposure data read in step 223 is obtained. In step 227, the difference data is referred to a disturbance coefficient conversion table of difference values, and a disturbance coefficient serving as an evaluation weight operation rate is obtained. In step 228, the evaluation weight is changed by multiplying the current evaluation weight by a disturbance coefficient. In step 229, the night evaluation value is obtained by taking a weighted average of the exposure data and the evaluation weight.

The determination of the night mode in step 240 is processed according to the flow described in FIG. In step 241, the presence or absence of day exposure data is determined. If there is day exposure data, the process proceeds to step 249 to delete the day exposure data. This day exposure data is stored in the second storage means of the day / night determination circuit 23. The day exposure data stored in the second storage means is erased by the first erase means (not shown) of the day / night determination circuit 23. Determination of the determination mode in step 260 is processed according to the flow described in FIG. In step 262, exposure data is acquired from the exposure control circuit 22, and in step 263, night exposure data is stored. There is also a method of using the exposure data acquired in step 221 for acquiring exposure data in step 262.

Note that the evaluation value calculation in step 120 and step 220 is performed only when the level or average value of the luminance signal (all data elements of the luminance signal data array) processed by the exposure control circuit 22 falls within a predetermined range. When executed, the evaluation value can be calculated more stably against disturbance. That is, if the disturbance information acquisition means operates only when the average value of the luminance signal is within a predetermined range, it becomes possible to calculate a more stable evaluation value against the disturbance. If the determination mode determination in step 160 is executed only when the day mode is shifted to the determination mode, the day exposure data immediately before the determination start can be held. Similarly, if the determination mode determination in step 260 is executed only when the mode is shifted from the night mode to the determination mode, the night exposure data immediately before the determination start can be held. These are effective in preventing an immediate return from one mode to the other so that mode switching does not occur too frequently.

As described above, in this embodiment, the sensitivity adjustment unit that adjusts the imaging sensitivity by changing the color balance of the luminance signal according to the shooting environment moves the infrared cut filter that is attached to the front surface of the imaging device so as to be inserted and removed. Consists of means. However, the present invention is not limited to this, and the sensitivity adjustment means can be configured by means for manipulating the color signal gain for adjusting the color balance of the color signal generation means for generating the color signal from the signal output from the image sensor. Such a color signal generation means is provided in the video processing circuit 21. For example, in the night mode, the color signal gain of the color signal generation means is increased as a whole or in the wavelength region of the infrared light component.

(Example 2)
Next, referring to FIG. 1 and FIG. 9, a method for removing a disturbance at the time of day / night determination according to a second embodiment of the present invention will be described. The day / night determination circuit 23 uses the exposure data generated by the exposure control circuit 22 to control the infrared cut filter according to the basic algorithm described in FIG.

In FIG. 9, when the power is turned on, the day / night determination circuit 23 first inserts the infrared cut filter 12 in step 110. Subsequently, in step 120a, day-state exposure data is acquired from the exposure control circuit 22, and an evaluation value is calculated. The calculated day evaluation value is compared with a threshold value for shifting to the night mode in step 130. If the evaluation value is greater than the threshold value, the process branches to step 140a and the day mode is determined. After the day mode is confirmed, the process returns to step 120a again to enter a loop for obtaining the day evaluation value. If the evaluation value is smaller than the threshold value for shifting to the night mode in step 130, the process branches to step 160a and shifts to the determination mode. In the determination mode, the infrared cut filter 12 is extracted in step 210, and the night mode determination is started.

Next, at step 220a, the night evaluation value is calculated from the exposure data of the exposure control circuit 22 as in step 120a. In step 230, the calculated night evaluation value is compared with a threshold value for shifting to the day mode. If the evaluation value is smaller than the threshold value, the process branches to step 240a, and if the day evaluation value is stored, it is deleted and the night mode is determined. After the night mode is determined, the process returns to step 220a again to enter a loop for acquiring the night evaluation value. If the evaluation value is larger than the threshold value for shifting to the date mode in step 230, the process branches to step 260a and shifts to the determination mode. In the determination mode, the infrared cut filter 12 is inserted again in step 110, and the day mode determination is started.

The day evaluation value calculation in step 120a is processed according to the flow described in FIG. First, at step 121, exposure data is acquired from the exposure control circuit 22. The exposure data is the data array described above. In step 122, the presence / absence of night exposure data is determined. If there is, the process proceeds to a direction in which the night threshold value in step 123 is corrected, and if not, the process proceeds to a direction in which the night threshold value in step 129 is not corrected. In step 123, the night exposure data stored in step 260a is read. In the following step 124, difference data between the exposure data acquired in step 121 and the night exposure data read out in step 123 is obtained. In step 125a, the average value of the difference data as the data array is calculated, and in step 127a, the correction value of the infrared light component is obtained by referring to the difference average value in the correction value conversion table. In step 128a, the infrared light component correction value is added to the night threshold value, so that the determination mode can be surely shifted to the night mode. Finally, in step 129, the day evaluation value is obtained by taking a weighted average of the exposure data and the evaluation weight. In this embodiment, the night threshold value is updated in this flow, but the evaluation weight is corrected in the day mode determination flow described in FIG.

The confirmation of the day mode in step 140a is processed according to the flow described in FIG. In step 141, the presence / absence of night exposure data is determined. If there is night exposure data, the process proceeds to the direction of deleting the night exposure data in step 142a, and if not, the process ends. That is, in the latter case, the evaluation weight is not corrected since the loop for acquiring the day evaluation value is entered. In step 142a, exposure data is acquired from the exposure control circuit 22. The exposure data is the data array described above. In subsequent step 143a, the night data stored in step 260a is read. In step 144a, difference data between the exposure data acquired in step 142a and the night exposure data read in step 143a is obtained. In step 145a, the average value of the difference data is calculated, and in step 146a, the average value is subtracted from the difference data as an offset. Thereby, a noise component can be removed effectively. In step 147a, the difference data (evaluation difference value) obtained by offsetting the average value is referred to the disturbance coefficient conversion table of the difference value to obtain a disturbance coefficient (disturbance information) that becomes the operation rate of the evaluation weight. In step 148a, the evaluation weight is changed by multiplying the current evaluation weight by a disturbance coefficient. Finally, at step 149, the night exposure data is erased.

The day mode determination in step 160a is processed according to the flow described in FIG. In step 161a, the presence / absence of day exposure data is determined. If there is day exposure data, the process proceeds to a step 162 in which the day exposure data is stored. If there is no day exposure data, the process ends. In step 162, exposure data is acquired from the exposure control circuit 22, and in step 163, day exposure data is stored.

The night evaluation value calculation in step 220a is processed according to the flow described in FIG. First, at step 221, exposure data is acquired from the exposure control circuit 22. In step 222, the presence / absence of day exposure data is determined. If there is day exposure data, the process proceeds to a direction in which the day threshold value in step 223 is corrected. In step 223, the day data stored in step 160a is read. In the following step 224, difference data between the exposure data acquired in step 221 and the day exposure data read in step 223 is obtained. In step 225a, an average value of the difference data is calculated, and in step 227a, the correction value of the infrared light component is obtained by referring to the difference average value in the correction value conversion table. In step 228a, the correction value (negative value) of the infrared light component is added to the day threshold value, so that the determination mode can be surely shifted to the day mode. Finally, in step 229, the night evaluation value is obtained by taking a weighted average of the exposure data and the evaluation weight.

The determination of the night mode in step 240a is processed according to the flow described in FIG. In step 241, the presence / absence of day exposure data is determined. If there is day exposure data, the process proceeds to the step of erasing the day exposure data in step 242a, and if not, the process ends. In step 242a, exposure data is acquired from the exposure control circuit 22. In the subsequent step 243a, the day data stored in step 160a is read. In step 244a, difference data between the exposure data acquired in step 242a and the day exposure data read in step 243a is obtained. In step 245a, the average value of the difference data is calculated, and in step 246a, the average value is subtracted from the difference data as an offset. In step 247a, the difference data is referred to the disturbance coefficient conversion table of the difference value to obtain a disturbance coefficient that becomes an operation rate of the evaluation weight. In step 248a, the evaluation weight is changed by multiplying the current evaluation weight by a disturbance coefficient. Finally, in step 249, the day exposure data is erased.

Determination of the determination mode in step 260a is processed according to the flow described in FIG. In step 261a, the presence / absence of night exposure data is determined. If there is night exposure data, the process proceeds to the direction of storing the night exposure data in step 262, and if not, the process ends. In step 262, exposure data is acquired from the exposure control circuit 22, and in step 263, night exposure data is stored.

The control method of the sensitivity adjustment unit of the imaging apparatus according to the above-described embodiment can be regarded as a method including the following steps. A luminance signal generation step of generating a luminance signal from a signal output from the image sensor; A sensitivity adjustment step for adjusting the imaging sensitivity by changing the color balance of the luminance signal according to the shooting environment. A disturbance information acquisition step of acquiring disturbance information using exposure data based on the luminance signal whose sensitivity is adjusted in the sensitivity adjustment step. An evaluation weight storage step for storing evaluation weights for evaluating exposure data. An evaluation weight correction step of correcting the evaluation weight using disturbance information. An evaluation value generating step of generating an evaluation value using the corrected evaluation weight and exposure data; Using the evaluation value generated in the evaluation value generation step, the state of the sensitivity adjustment means is between a state adjusted for shooting in a high illuminance environment and a state adjusted for shooting in a low illuminance environment. Switching step.

According to the present invention, it is possible to provide a program for causing a computer for controlling an imaging apparatus to execute the steps of such a control method. In other words, a storage medium in which a code of a software sensitivity adjusting means control program that embodies each function is recorded may be provided to the system or apparatus. The functions of the above-described embodiments can be realized by the computer (or CPU or MPU) of the system or apparatus reading and executing the program code stored in the storage medium. In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiments, and the storage medium storing the program code constitutes the present invention. As a storage medium for supplying such a program code, for example, a hard disk, an optical disk, a magneto-optical disk, or the like can be used. Alternatively, a CD-ROM, CD-R, magnetic tape, nonvolatile memory card, ROM, or the like can be used. Further, the functions of the above-described embodiments are not only realized by executing the program code read by the computer. This includes the case where the OS (operating system) running on the computer performs part or all of the actual processing based on the instruction of the program code, and the functions of the above-described embodiments are realized by the processing. ing. Further, the program code read from the storage medium may be written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer. Thereafter, the CPU of the function expansion board or function expansion unit performs part or all of the actual processing based on the instruction of the program code, and the functions of the above-described embodiments are realized by the processing. It is a waste.

As mentioned above, although the Example of this invention was described, it cannot be overemphasized that this invention is not limited to these Examples, A various deformation | transformation and change are possible within the range of the summary.

The present invention is applicable to an imaging apparatus that automatically determines a shooting mode and has a lot of disturbance during shooting.

10 .... Condenser lens, 11 .... Aperture mechanism, 12 .... Infrared cut filter (sensitivity adjusting means), 20..Image sensor, 21..Image processing circuit (luminance signal generating means), 22..Exposure control circuit , 23... Day / night determination circuit, 23 a .. Disturbance information acquisition means, 23 b .. Evaluation weight storage means, 23 c .. Evaluation weight correction means, 23 d .. Evaluation value generation means

Claims (8)

An image sensor;
A luminance signal generating means for generating a luminance signal from a signal output from the image sensor;
Sensitivity adjustment means for adjusting the imaging sensitivity by changing the color balance of the luminance signal according to the shooting environment;
Disturbance information acquisition means for acquiring disturbance information using exposure data based on a luminance signal whose sensitivity is adjusted by the sensitivity adjustment means;
Evaluation weight storage means for storing evaluation weights for evaluating the exposure data;
Evaluation weight correction means for correcting the evaluation weight using the disturbance information;
Evaluation value generating means for generating an evaluation value using the corrected evaluation weight and the exposure data;
With
Using the evaluation value from the evaluation value generating unit, the state of the sensitivity adjustment unit is between a state adjusted for shooting in a high illuminance environment and a state adjusted for shooting in a low illuminance environment. An imaging apparatus characterized by switching. A first storage unit that stores exposure data based on the luminance signal generated by the luminance signal generation unit when the sensitivity adjustment unit is in a state adjusted for photographing under a low illumination environment;
A second storage means for storing exposure data based on the luminance signal generated by the luminance signal generating means when the sensitivity adjustment means is adjusted to a state adjusted for photographing under a high illumination environment;
A first erasing unit for erasing the exposure data stored in the second storage unit when the sensitivity adjustment unit is in a state adjusted for photographing under a low illumination environment;
A second erasing unit for erasing the exposure data stored in the first storage unit when the sensitivity adjustment unit is in a state adjusted for shooting in a high-illuminance environment;
The imaging apparatus according to claim 1, further comprising: The imaging apparatus according to claim 1, wherein the disturbance information acquisition unit operates only when an average value of the luminance signals is within a predetermined range. 4. The imaging apparatus according to claim 1, wherein the sensitivity adjustment unit includes an infrared cut filter that is detachably attached to a front surface of the imaging element. 5. The said sensitivity adjustment means is comprised including the means to operate the color signal gain which adjusts a color balance of the color signal generation means which produces | generates a color signal from the signal output from the said image pick-up element, It is characterized by the above-mentioned. The imaging apparatus according to any one of 1 to 3. The imaging apparatus according to claim 1, wherein the luminance signal, the exposure data, and the evaluation weight have a grid-like data array. An imaging device control method comprising: an imaging device; and a sensitivity adjustment unit that adjusts imaging sensitivity by changing a color balance of a luminance signal according to a shooting environment,
A luminance signal generating step for generating a luminance signal from a signal output from the image sensor;
A sensitivity adjustment step for adjusting the imaging sensitivity by changing the color balance of the luminance signal according to the shooting environment;
Disturbance information acquisition step of acquiring disturbance information using exposure data based on the luminance signal whose sensitivity is adjusted in the sensitivity adjustment step;
An evaluation weight storage step for storing an evaluation weight for evaluating the exposure data;
An evaluation weight correction step of correcting the evaluation weight using the disturbance information;
An evaluation value generating step of generating an evaluation value using the corrected evaluation weight and the exposure data;
Using the evaluation value generated in the evaluation value generation step, the state of the sensitivity adjustment means is a state adjusted for shooting in a high illuminance environment and a state adjusted for shooting in a low illuminance environment. Switching between
The control method characterized by including. A computer for controlling an imaging device having an imaging device and a sensitivity adjustment unit that adjusts imaging sensitivity by changing a color balance of a luminance signal according to a shooting environment,
A program for executing the steps of the control method according to claim 7.

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