JP2021141433A - Imaging apparatus - Google Patents

Abstract

To provide a suitable image with an imaging apparatus of a mirror driving type.SOLUTION: The imaging apparatus according to one embodiment of an invention comprises: a first sensor for detecting light and generating a first detection signal; a field angle mask for shielding light outside a field angle; a mirror for reflecting light having passed through the field angle mask to the first sensor; a mirror driving device for driving the mirror to scan the light having passed through the field angle mask; and an image generation part for generating an image based on the first detection signal.SELECTED DRAWING: Figure 1

Description

An embodiment of the present invention relates to an imaging device that acquires an image by scanning a luminous flux driven by a mirror.

As a mirror-driven image pickup device, a large-field image input device disclosed in Patent Document 1 is known. This image input device uses a linear sensor as an image sensor, and generates a two-dimensional image by changing the angle of a galvanometer mirror arranged on the optical axis of the linear sensor. The image input device obtains a distortion-free image by controlling the deflection angle of the mirror. However, since the image input device performs distortion correction with a fixed pattern, it is only possible to correct distortion for a fixed non-linear operation, and it is not possible to deal with jitter distortion.

Further, in the mirror-driven image pickup device, there is also a requirement that the brightness of the image is appropriate.

Japanese Unexamined Patent Publication No. 04-203915

An object of the present invention is to provide a technique capable of obtaining a suitable image in a mirror-driven image pickup device.

The image pickup apparatus according to one aspect of the present invention has passed through a first sensor that detects light and generates a first detection signal, an angle-of-view mask that blocks light outside the angle of view, and the angle-of-view mask. An image is generated based on a mirror that reflects light to the first sensor, a mirror driving device that drives the mirror to scan the light that has passed through the angle of view mask, and the first detection signal. It includes an image generation unit.

According to the present invention, a suitable image can be obtained in a mirror-driven image pickup device.

The figure which shows the image pickup apparatus which concerns on embodiment of this invention. The perspective view which shows the photographing part shown in FIG. The perspective view which shows the angle-of-view mask shown in FIG. The figure explaining the level correction and the time axis correction performed by the image pickup apparatus of FIG. The figure for demonstrating the distortion by a jitter. The figure which shows the time passage and the mirror position in a triangular wave drive mode. The figure which shows the time passage and the mirror position in a sawtooth drive mode. The perspective view which shows the image pickup apparatus provided with the guide light source which concerns on embodiment of this invention. The figure which shows the image obtained by the image pickup apparatus shown in FIG. The figure which shows the image pickup apparatus which concerns on the related technique of this invention.

Hereinafter, embodiments will be described with reference to the drawings.

First, with reference to FIG. 10, a mirror-driven image pickup apparatus 1000 according to a related technique of the present invention will be briefly described. As shown in FIG. 10, the image pickup device 1000 includes a sensor 1002, a mirror 1004, a mirror drive device 1006, a timing generator 1010, a mirror control unit 1012, and an image processing unit 1020.

The mirror 1004 reflects the light incident on the image pickup apparatus 100 to the sensor 1002. The mirror drive device 1006 drives the mirror 1004 in order to scan the light incident on the image pickup device 100 in two dimensions. The mirror drive device 1006 is capable of swinging the mirror 1004 around two orthogonal axes. The mirror 1004 and the mirror drive device 1006 can be implemented as one MEMS (Micro-Electro-Mechanical Systems) device.

The sensor 1002 detects the light reflected by the mirror 1004 and generates a detection signal. For example, the sensor 1002 includes a photodetector that photoelectrically converts incident light to obtain an electric signal according to the intensity of the light. The detection signal is given to the image processing unit 1020.

The timing generator 1010 generates a timing signal for driving the mirror 1004. The mirror control unit 1012 controls the mirror 1004 according to a timing signal from the timing generator 1010. Specifically, the mirror control unit 1012 operates the mirror driving device 1006 according to the timing signal to change the direction (posture) of the mirror 1004.

The image processing unit 1020 receives a detection signal from the sensor 1002 and a timing signal from the timing generator 1010. The image processing unit 1020 extracts the detection signal of the section corresponding to the image from the received detection signal according to the timing signal, and generates an image based on the extracted detection signal. As described above, the mirror 1004 is driven so that the sensor 1002 scans the luminous flux in two dimensions. In this case, the image processing unit 1020 acquires a two-dimensional image.

The image processing unit 1020 includes a level correction unit 1022 that corrects the level of an image using a fixed value (fixed level). For example, the level correction unit 1022 lowers the pixel value of each pixel in the image by a fixed value. The image processing unit 1020 outputs a level-corrected image. For example, the image processing unit 1020 sends an image to the display device in order to display the image on the display device (not shown).

The image pickup apparatus 1000 having the above-described configuration causes the following problems. The stray light raises the black level of the image. In addition, the black level fluctuates due to temperature drift of the sensor 1002 and the like. Therefore, the brightness of the image cannot be properly corrected by the level correction using the fixed value. Further, the image is distorted due to the jitter generated in the detection signal due to the mirror drive. When a two-dimensional image is taken, image processing becomes difficult because the pixels in the low-speed axial direction are not aligned.

FIG. 1 schematically shows a mirror-driven imaging device (camera) 100 according to an embodiment of the present invention. As shown in FIG. 1, the image pickup device 100 includes a sensor 102, a mirror 104, a mirror drive device 106, an angle of view mask 108, a timing generator 110, a mirror control unit 112, a synchronous detection unit 114, and an optical black processing unit. It includes 116 and an image processing unit 120.

The angle-of-view mask 108 is provided on the objective (subject) side of the mirror 104 to block light outside the angle of view. The mirror 104 reflects the light that has passed through the angle of view mask 108 toward the sensor 102. The sensor 102 detects the light reflected by the mirror 104 and generates a detection signal. For example, the sensor 102 includes one photodetector that photoelectrically converts incident light to obtain an electrical signal according to the intensity of the light. A photodiode can be used as the photodetector. The photodetector may be a monochromatic photodetector or a multicolored photodetector. For example, a photodetector detects a red component (R), a green component (G), and a blue component (B) of incident light, and outputs an electric signal corresponding to the intensity of each of the red component, the green component, and the blue component. Generate. The detection signal is given to the synchronous detection unit 114, the optical black processing unit 116, and the image processing unit 120.

The mirror driving device 106 drives the mirror 104 in order to two-dimensionally scan the light that has passed through the angle of view mask 108. The mirror drive device 106 can swing the mirror 104 around two orthogonal axes. Specifically, the mirror drive device 106 can tilt (rotate) the mirror 104 around the first axis within a first angle range, and further, a second axis orthogonal to the first axis. The mirror 104 can be tilted (rotated) around within a second angle range. The first angle range is wider than the horizontal angle of view, and the second angle range is wider than the vertical angle of view. The mirror 104 and the mirror drive device 106 can be implemented as one MEMS device. The mirror 104 may be driven by, for example, a method using electrostatic drive. In this way, the mirror 104 and the mirror driving device 106 are configured to reflect light and form a two-dimensional image on the sensor 102.

Hereinafter, the sensor 102, the mirror 104, the mirror driving device 106, and the angle of view mask 108 are collectively referred to as a photographing unit.

FIG. 2 schematically shows a structural example of the photographing unit. In FIG. 2, the mirror drive device 106 is not shown. As shown in FIG. 2, the sensor 102, the mirror 104, and the mirror driving device 106 are housed in the lens barrel 200. The lens barrel 200 has a lens barrel lower portion 202 and a top plate (not shown). The mirror 104 and the mirror driving device 106 are mounted on the lower portion 202 of the lens barrel, and the sensor 102 is mounted on the top plate. The lens barrel 200 has an internal space in which the sensor 102, the mirror 104, and the mirror driving device 106 are arranged, and one opening that communicates the internal space and the external space. An angle-of-view mask 108 is provided in the opening of the lens barrel 200. In this arrangement, only the light that has passed through the angle of view mask 108 reaches the internal space of the lens barrel 200.

The mirror driving device 106 is configured to swing the mirror 104 around two orthogonal axes AX1 and AX2. In the example shown in FIG. 2, the axis AX1 passes through the center O of the reflecting surface of the mirror 104, and is a line segment connecting the center of the sensor 102 and the center 0 of the reflecting surface, and the opening center of the angle mask 108 and the center of the reflecting surface. It forms an angle of, for example, 45 degrees with respect to the line segment connecting 0. Axis AX2 passes through the center O of the reflective surface and is orthogonal to both of these line segments.

The light that has passed through the angle of view mask 108 is reflected by the mirror 104 and enters the sensor 102. In the vicinity of the outermost edge where the scanning position is within the angle of view (for example, the mirror 104 is tilted around the axis AX1 at an angle larger than the horizontal angle of view), the light is blocked by the angle of view mask 108 and does not enter the sensor 102.

FIG. 3 schematically shows a structural example of the angle of view mask 108. As shown in FIG. 3, the angle-of-view mask 108 has a hood-like shape, and is arranged so that the closer to the mirror 104, the smaller the opening area. By using the hood-shaped angle of view mask 108, stray light such as diffraction can be effectively reduced.

The angle of view mask 108 is not limited to the one shown in FIG. For example, the angle of view mask 108 may be a punched flat plate. The angle of view mask 108 may be implemented as part of the lens barrel 200.

Referring again to FIG. 1, the timing generator 110 generates a timing signal to drive the mirror 104. The timing signal can be a periodic pulse signal. The timing signal is given to the mirror control unit 112, the synchronization detection unit 114, and the optical black processing unit 116.

The mirror control unit 112 controls the mirror 104 according to a timing signal from the timing generator 110. Specifically, the mirror control unit 112 operates the mirror driving device 106 according to the timing signal to change the direction (posture) of the mirror 104 with respect to the sensor 102 and the angle of view mask 108. For example, the mirror control unit 112 controls the mirror 104 so as to perform a raster scan of the light that has passed through the angle of view mask 108. Specifically, the mirror control unit 112 has a first operation of rotating the mirror 104 around the axis AX1 and a second operation of rotating the mirror 104 around the axis AX2 while rotating the mirror 104 in the opposite direction around the axis AX1. And, the operation having is repeated. An image is generated from the detection signal obtained in the first operation. A detection signal corresponding to one horizontal pixel sequence can be obtained by executing the first operation once. A detection signal corresponding to one two-dimensional image can be obtained by executing the second operation once. The axis AX1 is a high-speed axis, and the axis AX2 is a low-speed axis.

The synchronization detection unit 114 receives the timing signal from the timing generator 110 and the detection signal from the sensor 102. The synchronization detection unit 114 detects the synchronization timing based on the timing signal and the detection signal. Specifically, the synchronization detection unit 114 detects the timing when the scanning position goes out of the angle of view and the timing when the scanning position enters the angle of view based on the timing signal and the detection signal. Hereinafter, the timing at which the scanning position goes out of the angle of view is referred to as an OB (optical black) entry timing, and the timing at which the scanning position enters the angle of view is referred to as an OB break timing. The synchronization detection unit 114 gives the image processing unit 120 synchronization information including the OB entry timing and the OB break timing. In the present embodiment, the synchronization timing includes the OB entry timing and the OB end timing. In other embodiments, the synchronization timing may include only one of the OB entry timing and the OB break timing.

The optical black processing unit 116 estimates the black level of the image based on the detection signal obtained during the optical black period. For example, the optical black processing unit 116 latches the detection signal obtained during the optical black period and filters the latched detection signal to obtain the black level. The optical black period is a period in which the scanning position is outside the angle of view. The optical black processing unit 116 specifies the optical black period based on the timing signal. The optical black processing unit 116 gives the image processing unit 120 black level information indicating the estimation result of the black level.

The image processing unit 120 receives the detection signal from the sensor 102, the synchronization information from the synchronization detection unit 114, and the black level information from the optical black processing unit 116. The image processing unit 120 generates a two-dimensional image based on the detection signal, synchronization information, and black level information. For example, the image processing unit 120 corrects the detection signal based on the synchronization information and the black level information, and generates a two-dimensional image based on the corrected detection signal. The image processing unit 120 includes a level correction unit 122 that performs level correction on the detection signal based on the black level information, and a time axis correction unit 124 that performs time axis correction (TBC) on the detection signal based on the synchronization information. And. The time axis correction may be performed after the level correction, or the level correction may be performed after the time axis correction. Level correction and time axis correction can be performed for each horizontal pixel sequence.

The level correction unit 122 corrects the level based on the comparison between the black level indicated by the black level information and the preset reference black level. For example, when the black level is higher than the reference black level, the level correction unit 122 lowers the pixel value by the difference obtained by subtracting the reference black level from the black level, and when the black level is lower than the reference black level, the level correction unit 122 lowers the pixel value from the reference black level to the black level. Increase the pixel value by the difference minus. As an example, (R value, G value, B value) = (16, 16, 16) is set as the reference black level. When the black level information indicates (R value, G value, B value) = (18, 20, 19), the R value is decremented by 2, the G value is decremented by 4, and the B value is decremented by 3 in each pixel. As a result, it is possible to obtain an image having appropriate brightness.

The time axis correction unit 124 corrects the time axis for the detection signal based on the OB entry timing and the OB break timing included in the synchronization information. For example, when the OB entry timing is earlier or later than the reference timing specified by the timing signal, the time axis correction unit 124 sets the section for extracting (latching) the detection signal by the difference between them with the optical sensor detection time axis. Shift on. When the period from the OB entry timing to the OB dawn timing is longer or shorter than the reference period specified by the timing signal, the time axis correction unit 124 transmits the detection signal by the difference between them on the optical sensor detection time axis. Shorten or stretch. As a result, the pixels in the low-speed axial direction (pixels in the vertical direction) can be aligned, and a distortion-free or small image can be obtained.

The image processing unit 120 outputs an image. For example, the image processing unit 120 sends an image to the display device in order to display the image on the display device (not shown).

The level correction and the time axis correction performed by the image pickup apparatus 100 will be described with reference to FIGS. 4 to 7. In FIG. 4, the pulse signal represented by the standard OB timing indicates the timing signal from the timing generator (TG) 110, and the pulse signal represented by the OB sampling gate indicates the optical black period. In the example shown in FIG. 4, the optical black processing unit 116 identifies the central portion of the period when the timing signal is high as the optical black period. The optical black processing unit 116 obtains an estimated black level from the pixel values indicated by the detection signals during the optical black period. As described above, the optical black processing unit 116 performs level correction on the detection signal based on the comparison between the estimated black level and the reference black level.

FIG. 5 schematically shows the relationship between the position of the mirror 104 (for example, corresponding to the rotation angle around the axis AX1) and the timing signal when the mirror 104 is driven in the triangular wave drive mode, and FIG. 6 shows the mirror 104. The relationship between the position of the mirror 104 and the timing signal when the mirror 104 is driven in the sawtooth drive mode is shown schematically. The circled parts in each of FIGS. 5 and 6 correspond to the period during which the rotation direction of the mirror 104 changes. Since the displacement rate of the mirror 104 changes during this period, the image obtained based on the detection signal obtained during this period is greatly distorted. Moreover, it is difficult to correct the detection signal obtained during this period by sampling or the like. Therefore, it is difficult to use the detection signal as an image area. Therefore, the scanning position is set to be outside the angle of view during the period when the rotation direction of the mirror 104 changes, and the detection signal obtained during that period is used for optical black (OB) detection. This makes it possible to correct the level without reducing the effective area.

Referring to FIG. 4 again, the synchronization detection unit 114 detects the OB entry timing during the period indicated in the OB entry detection period (in OB sens gate). The OB entry timing is the timing at which the scanning position moves from the inside of the angle of view to the outside of the angle of view, and can be specified by detecting that the signal strength or brightness indicated by the detection signal suddenly decreases (darkens). can. In this example, the period when the OB entry detection signal is High is the OB entry detection period, and the detection is performed, but not during the Low period.

Further, the synchronous detection unit 114 detects the OB dawn timing during the OB dawn detection period (out OB sens gate). The OB dawn timing is the timing at which the scanning position enters the angle of view from outside the angle of view, and can be specified by detecting that the signal strength or brightness indicated by the detection signal sharply increases (becomes brighter). can. In this example, the period when the OB dawn detection signal is High is the OB dawn detection period, and the detection is performed, but not during the Low period.

The time axis correction unit 124 extracts the detection signal of the section used for image generation according to the OB dawn timing and the OB entry timing included in the synchronization information. As shown in FIG. 7, when the OB dawn timing is earlier than the predetermined timing (faster), the time axis correction unit 124 shifts the extraction section of the detection signal so as to use the earlier portion on the optical sensor detection time axis. When the OB dawn timing is later than the predetermined timing (later), the time axis correction unit 124 shifts the extraction section of the detection signal so as to use the later portion on the optical sensor detection time axis. When the time axis correction unit 124 has a shorter period from the OB dawn timing to the OB entry timing (shorter), the time axis correction unit 124 transmits the extracted detection signal to a narrow portion on the optical sensor detection time axis. Use to enlarge. When the period from the OB dawn timing to the OB entry timing is longer than a predetermined period (longer), the time axis correction unit 124 reduces the extracted detection signal by using a wide portion on the optical sensor detection time axis. In this way, the time axis correction unit 124 corrects distortion in the time direction due to jitter or the like.

It may not be possible to detect the end of OB or the entry of OB. For example, when there is a black object at the boundary of the shooting range (the boundary of the field of view) or the state is close to shading, it may not be possible to detect OB dawn or OB entry. The shooting range is determined by the angle of view (horizontal angle of view and vertical angle of view). Also, even when the jitter is large, it is not possible to detect the end of OB or the entry of OB. The time axis correction unit 124 determines whether or not the detection result of the synchronization timing is appropriate. For example, the time axis correction unit 124 determines that the detection result is not valid when the OB dawn or the OB entry cannot be detected, and determines that the detection result is valid when both the OB dawn and the OB entry can be detected. judge. When the time axis correction unit 124 determines that the detection result is not appropriate, it recognizes that the distortion in the time direction cannot be corrected, and either uses the reference synchronization timing or uses a neighboring line (for example, horizontal adjacent to the top). Time axis correction by using the synchronization timing of the pixel string) or by interpolating the horizontal pixel string being processed with information about the pixels of the neighboring line or the previous frame (previously obtained image) (neighboring pixel information). I do. For example, in the case of an application in which an exact value is required for measurement or the like, the time axis correction unit 124 may add a flag to a place (pixel string) that has not been corrected.

Since the pixels in the low-speed axis direction (when the high-speed axis is the horizontal axis, the vertical axis direction) are aligned by the time axis correction, it is possible to add a plane two-dimensional filter process or a two-dimensional or three-dimensional filter process with time added. Become. As a result, it is possible to align and synthesize a plurality of images such as panoramic pasting.

As described above, in the present embodiment, the angle of view mask 108 that defines the angle of view is provided on the objective side of the mirror 104. As a result, stray light can be reduced, and an image having an appropriate black level can be obtained.

The image pickup apparatus 100 estimates the black level of the image based on the detection signal obtained by the sensor 102 during the period when the scanning position is outside the angle of view, and performs level correction based on the estimation result of the black level. As a result, it is possible to reduce black floating and sensor drift due to temperature and the like. As a result, an image having a more appropriate black level can be obtained.

The image pickup apparatus 100 detects the OB entry timing and the OB break timing, and corrects the time axis based on the detection result. As a result, distortion in the time direction due to jitter can be corrected. Further, it is possible to detect a time axis abnormality due to jitter. As a result, it is possible to obtain an image with no or little distortion.

The image processing unit 120 including the synchronization detection unit 114, the optical black processing unit 116, and the level correction unit 122 and the time axis correction unit 124 may be a monolithic IC (integrated circuit), FPGA (field programmable gate array), microcomputer, or the like. Can be implemented together in the processing circuit of. Furthermore, these have many common parts. Therefore, both the level correction and the time axis correction functions can be added with a small cost increase.

The present invention is not limited to the above-described embodiment. The above-described embodiment relates to a two-dimensional drive type imaging device that drives a mirror two-dimensionally. The above-mentioned method includes a one-dimensional drive type imager that drives a mirror one-dimensionally, an imager that includes a plurality of mirrors and obtains a two-dimensional or three-dimensional image by driving these mirrors, and a mirror with a variable imaging spectrum. It can also be applied to a driven image pickup device, an image pickup device that scans a light source with a mirror, and the like.

The imaging device may further include a sensor that detects light, which is different from the sensor 102. This sensor is arranged at a position where the light passing through the angle of view mask 108 (including the light reflected by the mirror 104) does not hit. The optical black processing unit 116 estimates the black level of the image based on the detection signal output from this sensor.

The image pickup apparatus may use a light source unit (also referred to as a guide light source) that generates light that emphasizes the boundary of the field.

FIG. 8 schematically shows a mirror-driven imaging device according to an embodiment of the present invention. The image pickup apparatus shown in FIG. 8 includes an illumination 802 and a reflection apparatus 804 in addition to the configuration shown in FIG. The illumination 802 and the reflector 804 correspond to a light source unit that generates light that emphasizes the boundary of the field.

The illumination 802 and the reflection device 804 are relatively fixed to the photographing unit and / or the subject of the imaging device. In the example shown in FIG. 8, the illumination 802 is fixed to the lens barrel 200 of the photographing unit, and the illumination 802 and the reflector 804 are arranged so that the subject is positioned between them. The reflection device 804 has a reflection unit 806 and a light shielding unit 808. The reflection unit 806 reflects the light emitted from the illumination 802. The light-shielding unit 808 blocks (for example, absorbs) the light emitted from the illumination 802. In the example shown in FIG. 8, the reflection portion 806 is one surface of the structure, the light shielding portion 808 is a light absorbing member attached to a part of this surface, and the light shielding portion 808 is located in the central portion of the photographing range. Then, the reflecting portions 806 are located at both ends of the photographing range. The light-shielding unit 808 does not have to absorb all the light, and may have a reflectance that is common as a shooting back, such as 18% reflection.

FIG. 9 schematically shows an image obtained by photographing a subject in the situation shown in FIG. As shown in FIG. 9, the imaging back region 904 by the guide light shading in the inner center of the photographing range 908 corresponds to the shading portion 808. The guide light regions 902 inside the photographing range 908 and at both ends of the imaging back region 904 are bright regions corresponding to the reflecting portion 806. The image area 906 outside the shooting range 908 is an image area when the scanning position is outside the angle of view, and is a dark area. The guide light region 902 and the image region 906 are adjacent to each other, and the contrast between the guide light region 902 and the image region 906 is large. In this way, the field boundary can be emphasized by using the illumination 802 and the reflector 804. As a result, the OB entry timing and the OB break timing can be detected more accurately, and the distortion of the image can be reduced more effectively.

In the configuration shown in FIG. 8, reflecting portions 806 are provided on the left and right sides of the light-shielding portion 808 in order to perform jitter correction in the horizontal direction. Alternatively or additionally, reflecting portions 806 may be provided above and below the light shielding portion 808 in order to perform jitter correction in the vertical direction.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

100 ... Imaging device, 102 ... Sensor, 104 ... Mirror, 106 ... Mirror drive device, 108 ... Angle mask, 110 ... Timing generator, 112 ... Mirror control unit, 114 ... Synchronous detection unit, 116 ... Optical black processing unit, 120 ... Image processing unit, 122 ... Level correction unit, 124 ... Time axis correction unit, 200 ... Lens barrel, 202 ... Lower lens barrel, 802 ... Lighting, 804 ... Reflector, 806 ... Reflection unit, 808 ... Shading unit, 902 ... Guide light region, 904 ... Imaging back region by shielding light shading, 906 ... Image region, 908 ... Shooting range, 1000 ... Imaging device, 1002 ... Sensor, 1004 ... Mirror, 1006 ... Mirror drive device, 1010 ... Timing generator, 1012 ... Mirror control unit, 1020 ... Image processing unit, 1022 ... Level correction unit.

Claims (7)

A first sensor that detects light and generates a first detection signal,
An angle of view mask that blocks light outside the angle of view,
A mirror that reflects the light that has passed through the angle of view mask to the first sensor, and
A mirror drive device that drives the mirror to scan the light that has passed through the angle of view mask.
An image generation unit that generates an image based on the first detection signal, and an image generation unit.
An imaging device comprising. An optical black processing unit that estimates the black level of an image based on the first detection signal obtained by the first sensor when the scanning position is outside the angle of view is further provided.
The image generation unit corrects the black level for the first detection signal based on the estimation result of the black level.
The imaging device according to claim 1. A second sensor that is arranged at a position where the light that has passed through the angle of view mask does not hit, detects the light, and generates a second detection signal.
An optical black processing unit that estimates the black level of an image based on the second detection signal, and an optical black processing unit.
With more
The image generation unit corrects the black level for the first detection signal based on the estimation result of the black level.
The imaging device according to claim 1. Synchronization including at least one of a timing at which the scanning position enters the angle of view from outside the angle of view and a timing at which the scanning position exits from within the angle of view based on the first detection signal. It also has a synchronous detector that detects the timing.
The image generation unit corrects the time axis for the first detection signal based on the detection result of the synchronization timing.
The imaging device according to any one of claims 1 to 3. The mirror driving device drives the mirror in order to two-dimensionally scan the light that has passed through the angle of view mask.
The first detection signal includes detection signals corresponding to a plurality of pixel sequences, and includes detection signals.
The image generation unit determines whether or not the detection result is valid for each pixel sequence, and if the detection result is valid, performs time axis correction on the detection signal corresponding to the pixel sequence. If the detection result is not valid, the detection signal corresponding to the pixel string close to the pixel string is used to perform time axis correction on the detection signal corresponding to the pixel string.
The imaging device according to claim 4. The imaging device according to any one of claims 1 to 5, further comprising a light source unit that generates light that emphasizes the boundary of the photographing range. The imaging device according to claim 6, wherein the light source unit includes a light source, a reflecting unit that reflects light from the light source, and a reflecting device that includes a light-shielding unit that blocks light from the light source.

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