CN111735536B - Detection system and method for simulating human eye perception brightness - Google Patents
Detection system and method for simulating human eye perception brightness Download PDFInfo
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Abstract
The invention discloses a detection system and a detection method for simulating human eye perception brightness, wherein the central normal of an aperture diaphragm, the central normal of a photoelectric image sensor and the central normal of an optical filter in the system are all superposed with the optical axis of an imaging lens; the optical filter is positioned in front of the photoelectric image sensor; the spectral transmittance of the optical filter, the spectral transmittance of the imaging lens and the spectral response of the photoelectric image sensor are combined to obtain a relative spectral response which is consistent with a human eye spectral luminous efficiency function; the data processing system is used for acquiring image data measured by the photoelectric image sensor, dividing pixels of a measured image into a series of visual field micro-partitions from the center to the periphery of a visual field according to unequal areas, dividing the areas of the partitions according to the proportional relation of the density reciprocal of photosensitive cells of a human retina from the center of a fovea to the periphery of the fovea, and calculating the brightness value of each visual field micro-partition according to the brightness of the pixels around the visual field micro-partition corresponding to the center to obtain the brightness of an image unit.
Description
Technical Field
The invention relates to the technical field of photometric measurement, in particular to a detection system and a detection method for simulating human eye perception brightness.
Background
In the fields of illumination, display, industrial inspection, and the like, luminance measurement is a very common photometric technique. With the development of CCD two-dimensional image sensors, CCD image sensors are widely used for two-dimensionally distributed luminance image measurement. The signal on each image sensor pixel corresponds to the brightness of a certain point (small area) on the measurement target. For example, image brightness meters using CCD image sensors are used to measure parameters such as average brightness, brightness uniformity, contrast, resolution, etc. of the display screen.
The existing brightness image measuring system using a CCD image sensor generally includes a lens and a CCD image sensor, pixels on the image sensor are uniformly arranged, and the average brightness of a certain area is obtained by accumulating and averaging signals of each pixel in the area. The prior brightness measuring device and method do not consider the visual characteristics of human eyes, for example, 1) the human eyes are an image brightness perception system with constant visual angle, namely, the visual angle resolution is constant when normal eyes focus on far and near targets, and the minimum resolution linear degree (size) of the actual surface of the target is related to the distance; 2) Human eye photoreceptor cells (rod body cells and cone cells) are extremely unevenly distributed on a visual network, the cone cell density is high and is low in the fovea central area, and the rod cell density is high and is low when the human eye photoreceptor cells leave the fovea central area; 3) The human eye views the surrounding environment, involving eye movement and head movement, aiming the fovea at the target to be accurately resolved.
In image measurement and laser display visual speckle measurement of head-mounted virtual display equipment (such as AR and VR glasses), the existing method has the problems of poor precision, large difference with the actual human eye perception result and the like.
Disclosure of Invention
The embodiment of the invention aims to provide a system and a method for detecting brightness by simulating human eye perception, so as to solve the problems of poor precision and large difference with an actual human eye perception result in the existing method.
In order to achieve the above purpose, the technical solution adopted by the embodiment of the present invention is as follows:
the embodiment of the invention provides a detection system for simulating human eye perception brightness, which comprises an aperture diaphragm, an imaging lens, an optical filter, a photoelectric image sensor, a base and a data processing system, wherein the aperture diaphragm is arranged on the base; the central normal of the aperture diaphragm, the central normal of the photoelectric image sensor and the central normal of the optical filter are all superposed with the optical axis of the imaging lens; the aperture diaphragm, the imaging lens, the optical filter and the photoelectric image sensor are all arranged on the base, and the optical filter is positioned in front of the photoelectric image sensor; the spectral transmittance of the optical filter, the spectral transmittance of the imaging lens and the spectral response of the photoelectric image sensor are combined to obtain a relative spectral response which is consistent with a human eye spectral luminous efficiency function; the data processing system is connected with the photoelectric image sensor and used for extracting image data measured by the photoelectric image sensor, partitioning pixels of a measured image from the center to the periphery of a visual field according to unequal areas and dividing the pixels into a series of visual field micro-partitions, dividing the areas of the partitions according to the proportional relation of the density reciprocal of photosensitive cells of a human retina from the center to the periphery of a fovea, and calculating the brightness value of each visual field micro-partition to obtain the brightness of an image unit, wherein the center of the visual field corresponds to the center of the fovea; the brightness value of each view field micro-partition is calculated by the brightness of the surrounding pixels corresponding to the center of the view field micro-partition, and the brightness of the image unit is obtained.
Further, the aperture diaphragm is positioned on a focus in front of the imaging lens; focal length f of imaging lens and photoelectric image sensorThe pixel spacing d being related by a focal length f greater than
。
Further, the focal length f of the imaging lens and the total field of view range measured by the photoelectric image sensor
Associated with a focal length f smaller than
D is the size of the short side of the photosensitive surface of the photoelectric image sensor,
is the total field of view range of the measurement image.
Furthermore, a distance measuring laser and a translation mechanism are also arranged on the base, and a measuring beam of the distance measuring laser is parallel to the optical axis of the imaging lens and points to the direction of a measuring target; the distance measurement starting point position of the distance measurement laser is consistent with the entrance pupil corresponding to the aperture diaphragm; the aperture diaphragm and the imaging lens are fixedly connected with the base, the photoelectric image sensor is installed on the translation mechanism and can move along the direction of the optical axis of the imaging lens, and the moving position is changed according to the distance information of the ranging laser.
Furthermore, an eye movement rotary motion table is arranged on the base; the eye movement rotary motion table at least comprises a pitching rotating shaft and a left and right rotating shaft, wherein the axes of the pitching rotating shaft and the left and right rotating shaft are mutually orthogonal and are mutually orthogonal with the optical axis of the imaging lens; the orthogonal point is located 10mm behind the center of the entrance pupil corresponding to the aperture stop.
Furthermore, an eye movement rotary motion table is arranged on the base; the eye movement rotary motion table at least comprises a pitching rotating shaft and a left rotating shaft and a right rotating shaft, wherein the axes of the pitching rotating shaft and the left rotating shaft and the right rotating shaft are mutually orthogonal; the orthogonal point coincides with the center of the entrance pupil corresponding to the aperture stop.
Furthermore, a head-moving rotary motion table is also arranged on the base; the head-moving rotary motion table comprises a horizontal shaft capable of pitching and rotating 180 degrees and a vertical shaft which is orthogonal to the horizontal shaft and can rotate 360 degrees; the vertical axis is orthogonal to the optical axis of the imaging lens, and the orthogonal point is located between 100mm and 130mm above the orthogonal point of the horizontal axis and the vertical axis.
Furthermore, a head-moving rotary motion table is also arranged on the base; the head-moving rotary motion table comprises a horizontal shaft capable of pitching and rotating 180 degrees and a vertical shaft which is orthogonal to the horizontal shaft and can rotate 360 degrees; the vertical axis and the optical axis of the imaging lens are perpendicular to each other but do not intersect and are separated by 27mm to 36mm, and the footdrop point of the optical axis of the imaging lens vertically projected on the vertical axis is located between 100mm to 130mm above the orthogonal point of the horizontal axis and the vertical axis.
The embodiment of the invention also provides a detection method of the system for simulating human eye perception brightness, which comprises the following steps:
step S100, extracting image data measured by a photoelectric image sensor;
step S101, dividing pixels of a measurement image into a series of visual field micro-divisions from the center to the periphery of a visual field according to unequal areas, dividing the areas of the divisions according to the proportional relation of the density reciprocal of photosensitive cells of the retina of a human eye from the center of fovea to the periphery, wherein the center of the visual field corresponds to the center of fovea of the retina;
step S102, calculating the brightness value of each view micro-area to obtain the brightness of an image unit; the brightness value of each view field micro-partition is calculated by the brightness of the surrounding pixels corresponding to the center of the view field micro-partition, and the brightness of the image unit is obtained.
Further, the step S101 specifically includes:
the pixels of the measured image are divided into zones at unequal intervals in the radial direction by concentric rings according to the proportional relation of the reciprocal density of cone photoreceptor cells of the fovea in the center of the retina of the human eye, and the division is carried out in the circumferential direction of each ring according to the radial width of the ring; the field angle corresponding to the view field micro-regions is 1/60 degree to 1/120 degree (plane angle), and the field angle corresponding to the view field micro-regions away from the central region is gradually increased; the corresponding brightness of the image unit is obtained by the accumulative average calculation of the brightness of the pixels contained in the view field micro-partition; the spectral transmittance of the optical filter, the spectral transmittance of the imaging lens and the spectral response of the photoelectric image sensor are combined, and the combined relative spectral response is consistent with a human eye photopic vision spectral luminous efficiency function.
Further, the step S101 specifically includes:
the pixels of the measured image are segmented from the center to the periphery according to the proportional relation of reciprocal densities of the retina photoreceptor cells of the human eye according to the approximate hexagonal shape, and are segmented into a series of visual field micro-segments of the approximate hexagonal shape; the area of the visual field micro-partition which is approximate to the hexagonal prism is consistent with the reciprocal of the density of cone photoreceptor cells at the fovea and the periphery of the retina of the human eye; furthermore, the center of the measurement image is a prismatic visual field micro-area, and the corresponding visual field angle is 1/60 degree to 1/120 degree (plane angle); the field angle corresponding to the view field micro-area away from the central area is gradually increased; the image element brightness is calculated from the cumulative average of the pixel brightness signals involved over the corresponding field of view micro-regions.
The beneficial effect of this system is: the method realizes the simulation of the perception characteristic of simulating the brightness of human eyes, has the same effect with the real perception effect of human eyes, and has high detection precision and wide application range. The focal length of the imaging lens is related to the total field of view measured by the photoelectric image sensor, so that the field of view of the photoelectric image sensor is close to the field of view of the fovea of the retina of a human eye. Aperture diaphragm and imaging lens and base fixed connection, photoelectric image sensor installs on translation mechanism, can follow imaging lens optical axis direction and remove, and the position of removal changes according to the distance information of range finding laser instrument, and when realizing that simulation people's eye focuses on different distance targets, the point of view is unchangeable, and automatically regulated focusing distance, convenient measurement, the precision is high.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a system for detecting brightness sensed by human eyes in an embodiment of the present invention;
FIG. 2 is a graph illustrating a spectral luminous efficiency function of a human eye according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an embodiment of the present invention showing the density distribution of rod photoreceptor cells and cone photoreceptor cells relative to the foveal center;
FIG. 4 is a schematic diagram illustrating a relationship between a focal length of an imaging lens and a pixel pitch of a photoelectric image sensor according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an embodiment of the present invention, in which an aperture stop is provided in front of a focal point of an imaging lens;
FIG. 6 is a schematic view of micro-regions providing a field of view range of a photoelectric image sensor according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of two configurations of a vertical rotation axis and a horizontal rotation axis of a head-moving rotation stage according to an embodiment of the present invention (a is a vertical axis perpendicular to an optical axis of an imaging lens, and b is a vertical axis perpendicular to the optical axis of the imaging lens but not intersecting the optical axis);
in the figure: a-a measurement target; 1-aperture diaphragm; 2-an imaging lens; 3-an optical filter; 4-photoelectric image sensor, 4-1 field of view range, 4-2 field of view micro-partition; 5-a data processing system; 6-a ranging laser; 7-a translation mechanism; 8-rotating the motion table.
Detailed Description
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art, in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and the same devices are denoted by the same reference numerals, and thus the description thereof will be omitted.
The embodiment of the invention provides a detection system and a detection method for simulating human eye perception brightness, which are combined with figures 1-7 and comprise an aperture diaphragm 1, an imaging lens 2, an optical filter 3, a photoelectric image sensor 4, a base 9 and a data processing system 5; the central normal of the aperture diaphragm 1, the central normal of the photoelectric image sensor 4 and the central normal of the optical filter 3 are all coincided with the optical axis of the imaging lens 2; the aperture diaphragm 1, the imaging lens 2, the optical filter 3 and the photoelectric image sensor 4 are all arranged on the base 9, and the optical filter 3 is positioned in front of the photoelectric image sensor 4; the spectral transmittance of the optical filter 3, the spectral transmittance of the imaging lens 2 and the spectral response of the photoelectric image sensor 4 are combined to obtain a relative spectral response which is consistent with a human eye spectral luminous efficiency function; the data processing system 5 is connected to the photoelectric image sensor 4 and is configured to obtain image data measured by the photoelectric image sensor 4.
The embodiment also provides a method for detecting the brightness perceived by the human eyes, which comprises the following steps:
step S100, extracting image data measured by the photoelectric image sensor 4;
step S101, dividing pixels of a measurement image into a series of visual field micro-divisions 4-2 from the center to the periphery of a visual field according to unequal areas, and dividing the areas of the divisions according to the proportional relation of the density reciprocal of photosensitive cells of a retina of a human eye from the center of a fovea to the periphery; the center of the field of view corresponds to the foveal center;
step S102, calculating the brightness value of each view micro-area 4-2 to obtain the brightness of an image unit; the brightness value of each view field micro-partition 4-2 is calculated from the brightness of the surrounding pixels corresponding to the center of the view field micro-partition 4-2, and the brightness of the image unit is obtained.
In this embodiment, with reference to fig. 4, the aperture stop 1 is located at a focus in front of the imaging lens 2, a pixel unit of the photoelectric image sensor always receives an optical signal in a corresponding field angle direction, and the field direction is constant and consistent with human eyes; the focal length f of the imaging lens 2 is related to the pixel interval d of the photoelectric image sensor 4, and the focal length f is larger than
。
Resolution of the photoelectric image sensor measurement image: where d is the pixel pitch of the photo image sensor 4 and f is the focal length of the lens, the resolving field angle (radian) of the image is measured for the photo image sensor 4, which results in that the resolving power of the photo image sensor 4 for measuring the image is greater than 1/120 degree (plane angle) of the highest spatial resolution in the center of the human eye.
Further, referring to fig. 4 and 5, the focal length f of the imaging lens 2 and the total field range measured by the photoelectric image sensor 4
Associated with a focal length f smaller than
D is the size of the short side of the light-sensitive surface of the photoelectric image sensor 4,
the total field of view of the image is measured, and the field of view of the photoelectric image sensor 4 is 4-1, which is close to the visual angle range of the fovea of the retina of the human eye.
In this embodiment, the base 9 is further provided with a distance measuring laser 6 and a translation mechanism 7, and a measuring beam of the distance measuring laser 6 is parallel to an optical axis of the imaging lens 2 and points to a direction of a measuring target a; the distance measurement starting point position of the distance measurement laser 6 is consistent with the position of the aperture diaphragm 1 in front of the imaging lens 2 or the position of the entrance pupil aperture diaphragm 1 corresponding to the aperture diaphragm 1 behind the imaging lens 2 or the middle of the lens therein; aperture diaphragm 1 and imaging lens 2 and 9 fixed connection of base, photoelectric image sensor 4 installs on translation mechanism 7, can follow 2 optical axis directions of imaging lens and remove, and the position of removal changes according to range finding laser 6's distance information, realizes that simulation people's eye focuses on when different distance targets, and the point of view is unchangeable, and automatically regulated focus distance, convenient measurement, the precision is high.
One embodiment is as follows:
the base 9 is provided with an eye movement rotary motion platform; the eye movement rotary motion table at least comprises a pitching rotary shaft and a left and right rotary shaft, wherein the axes of the pitching rotary shaft and the left and right rotary shaft are mutually orthogonal and mutually orthogonal with the optical axis of the imaging lens 2; the orthogonal point is located 10mm behind the center of the entrance pupil corresponding to the aperture stop 1 (when the aperture stop 1 is located in front of the imaging lens 2, the aperture stop 1 is the entrance pupil).
The movement mode of the eyeball rotation center is simulated, so that the measurement is more accurate and convenient.
One embodiment is as follows:
the base 9 is provided with an eye movement rotary motion platform; the eye movement rotary motion table at least comprises a pitching rotating shaft and a left rotating shaft and a right rotating shaft, wherein the axes of the pitching rotating shaft and the left rotating shaft and the right rotating shaft are mutually orthogonal; the orthogonal point coincides with the center of the entrance pupil corresponding to the aperture stop 1 (when the aperture stop 1 is positioned in front of the imaging lens 2, the aperture stop 1 is the entrance pupil).
The movement mode of rotating around the pupil of the human eye is simulated, so that the measurement is more accurate and convenient.
With reference to fig. 7, one embodiment: the base 9 is also provided with a head moving and rotating motion table; the head-moving rotary motion table comprises a horizontal shaft capable of pitching and rotating 180 degrees and a vertical shaft which is orthogonal to the horizontal shaft and can rotate 360 degrees; the vertical axis is orthogonal to the optical axis of the imaging lens 2, and the orthogonal point is located between 100mm and 130mm above the orthogonal point of the horizontal axis and the vertical axis.
The method of rotating the human head and watching the human head by a single eye is simulated, so that the measurement is more accurate and convenient.
With reference to fig. 7, one embodiment:
the base 9 is also provided with a head moving and rotating motion table; the head-moving rotary motion table comprises a horizontal shaft capable of rotating in a pitching mode by 180 degrees and a vertical shaft which is orthogonal to the horizontal shaft and can rotate by 360 degrees; the vertical axis and the optical axis of the imaging lens 2 are perpendicular to each other but do not intersect and are separated by between 27mm and 36mm, and the footdrop point of the vertical projection of the optical axis of the imaging lens 2 on the vertical axis is located between 100mm and 130mm above the orthogonal point of the horizontal axis and the vertical axis. The method simulates the modes of head rotation and binocular viewing, so that the measurement is more accurate and convenient.
The embodiment of the invention also provides a detection method of a system for simulating human eye perception brightness, which is realized in the system and comprises the following steps:
step S100, extracting image data measured by the photoelectric image sensor 4;
step S101, dividing pixels of a measurement image into a series of visual field micro-divisions 4-2 from the visual field center to the periphery according to unequal area division, wherein the area of the division is divided according to the proportional relation of the density reciprocal of photosensitive cells of the human retina from the fovea center to the periphery, and the visual field center corresponds to the fovea center;
step S102, calculating the brightness value of each view micro-area 4-2 to obtain the brightness of an image unit; the brightness value of each view micro-partition 4-2 is calculated by the brightness of the surrounding pixels corresponding to the center of the view micro-partition 4-2, and the brightness of the image unit is obtained.
Optionally, with reference to fig. 6, in step S101, specifically, the method includes:
the pixels of the measured image are divided into zones at unequal intervals in the radial direction by concentric rings according to the proportional relation of the reciprocal density of cone photoreceptor cells of the fovea in the center of the retina of the human eye, and the division is carried out in the circumferential direction of each ring according to the radial width of the ring; the field angle corresponding to the view field micro-area 4-2 is 1/60 degree to 1/120 degree (plane angle), and the field angle corresponding to the view field micro-area 4-2 away from the central area is gradually increased; the corresponding image unit brightness is calculated by the accumulated average of the brightness of the pixels contained in the view field micro-partition 4-2; the spectral transmittance of the optical filter 3, the spectral transmittance of the imaging lens 2 and the spectral response of the photoelectric image sensor 4 are combined, and the combined relative spectral response is consistent with a human eye photopic vision spectral luminous efficiency function.
Optionally, in step S101, the method specifically includes:
the pixels of the measured image are divided into a series of visual field micro-partitions 4-2 which approximate to a hexagonal shape from the center to the periphery according to the proportional relation of reciprocal densities of the retina photoreceptor cells of the human eye; the area of a visual field micro-partition 4-2 similar to a hexagonal prism is consistent with the reciprocal of the density of cone photoreceptor cells at the fovea and periphery of the retina of a human eye; furthermore, the center of the measurement image is a prismatic view field micro-area 4-2, and the corresponding view field angle is 1/60 degree to 1/120 degree (plane angle); the field angle corresponding to the view field differential area 4-2 away from the central area is gradually increased; the image element luminance is calculated from the cumulative average of the pixel luminance signals involved on the corresponding field of view micro-section 7-2. The shape characteristics of the human retina photoreceptor cells are better met according to the approximate hexagonal shape division.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A human eye perception simulation brightness detection system is characterized by comprising an aperture diaphragm (1), an imaging lens (2), an optical filter (3), a photoelectric image sensor (4), a base (9) and a data processing system (5); the central normal of the aperture diaphragm (1), the central normal of the photoelectric image sensor (4) and the central normal of the optical filter (3) are all coincided with the optical axis of the imaging lens (2); the aperture diaphragm (1), the imaging lens (2), the optical filter (3) and the photoelectric image sensor (4) are all arranged on the base (9), and the optical filter (3) is positioned in front of the photoelectric image sensor (4); the spectral transmittance of the optical filter (3), the spectral transmittance of the imaging lens (2) and the spectral response of the photoelectric image sensor (4) are combined to obtain a relative spectral response which is consistent with a human eye spectral luminous efficiency function; the data processing system (5) is connected with the photoelectric image sensor (4) and is used for extracting image data measured by the photoelectric image sensor (4), dividing pixels of a measured image into a series of visual field micro-partitions (4-2) from the center to the periphery of a visual field according to unequal area, dividing the area of each partition according to the proportional relation of the reciprocal of the density of photosensitive cells of human retina from the center of fovea to the periphery of fovea, wherein the center of the visual field corresponds to the center of fovea, and calculating the brightness value of each visual field micro-partition (4-2) to obtain the brightness of an image unit; wherein, the brightness value on each view field micro-partition (4-2) is calculated by the brightness of the surrounding pixels corresponding to the center of the view field micro-partition (4-2), and the brightness of the image unit is obtained.
2. The system for detecting brightness perceived by human eyes as claimed in claim 1, wherein the aperture diaphragm (1) is located at a front focus of the imaging lens (2); the focal length f of the imaging lens (2) is related to the pixel interval d of the photoelectric image sensor (4), and the focal length f is larger than
。
3. The system for detecting brightness perceived by human eyes according to claim 1 or 2, wherein the focal length f of the imaging lens (2) is equal to the total field of view range measured by the photoelectric image sensor (4)
Associated with a focal length f smaller than
D is the size of the short side of the light-sensitive surface of the photoelectric image sensor (4),
is the total field of view range of the measurement image.
4. The system for detecting the brightness perceived by the human eye in the simulated manner according to claim 1, wherein a distance measuring laser (6) and a translation mechanism (7) are further mounted on the base (9), and a measuring beam of the distance measuring laser (6) is parallel to the optical axis of the imaging lens (2) and points to the direction of a measuring target (A); the distance measurement starting point position of the distance measurement laser (6) is consistent with the entrance pupil corresponding to the aperture diaphragm (1); the aperture diaphragm (1) and the imaging lens (2) are fixedly connected with the base (9), the photoelectric image sensor (4) is installed on the translation mechanism (7) and can move along the direction of the optical axis of the imaging lens (2), and the moving position is changed according to the distance information of the ranging laser (6).
5. The system for simulating human eye perception brightness detection according to claim 1, further comprising a rotational motion stage (8), wherein the rotational motion stage (8) comprises an eye-movement rotational motion stage and/or a head-movement rotational motion stage.
6. The system for detecting the brightness perceived by the human eye in a simulated manner according to claim 5, wherein the base (9) is provided with an eye movement rotating motion platform; the eye movement rotary motion table at least comprises a pitching rotating shaft and a left and right rotating shaft, wherein the axes of the pitching rotating shaft and the left and right rotating shaft are mutually orthogonal and are mutually orthogonal with the optical axis of the imaging lens (2); the orthogonal point is positioned 10mm behind the center of the entrance pupil corresponding to the aperture diaphragm (1).
7. The system for detecting the brightness perceived by the human eye in a simulated manner according to claim 5, wherein the base (9) is provided with an eye movement rotating motion platform; the eye movement rotary motion table at least comprises a pitching rotating shaft and a left rotating shaft and a right rotating shaft, wherein the axes of the pitching rotating shaft and the left rotating shaft and the right rotating shaft are mutually orthogonal; the orthogonal point coincides with the center of the entrance pupil corresponding to the aperture diaphragm (1).
8. The system for detecting the brightness perceived by the human eyes as the claim 5, the claim 6 or the claim 7 is characterized in that a head-moving rotating motion platform is further arranged on the base (9); the head-moving rotary motion table comprises a horizontal shaft capable of pitching and rotating 180 degrees and a vertical shaft which is orthogonal to the horizontal shaft and can rotate 360 degrees; the vertical axis is orthogonal to the optical axis of the imaging lens (2), and the orthogonal point is located between 100mm and 130mm above the orthogonal point of the horizontal axis and the vertical axis.
9. The system for detecting the brightness perceived by the human eyes as the claim 5, the claim 6 or the claim 7 is characterized in that a head-moving rotating motion platform is further arranged on the base (9); the head-moving rotary motion table comprises a horizontal shaft capable of rotating in a pitching mode by 180 degrees and a vertical shaft which is orthogonal to the horizontal shaft and can rotate by 360 degrees; the vertical axis and the optical axis of the imaging lens (2) are perpendicular to each other but do not intersect and are separated by 27mm to 36mm, and the footdrop of the vertical projection of the optical axis of the imaging lens (2) on the vertical axis is located between 100mm to 130mm above the orthogonal point of the horizontal axis and the vertical axis.
10. The detection method for simulating the human eye perception brightness detection system according to the claim 1, characterized by comprising:
step S100, extracting image data measured by a photoelectric image sensor (4);
step S101, dividing pixels of a measurement image into a series of visual field micro-divisions (4-2) from the visual field center to the periphery according to unequal areas, dividing the areas of the divisions according to the proportional relation of the inverse of the density of the photoreceptor cells of the human retina from the fovea center to the periphery, wherein the visual field center corresponds to the fovea center;
step S102, calculating the brightness value of each view field micro-partition (4-2) to obtain the brightness of an image unit; wherein the brightness value on each view field micro-partition (4-2) is calculated by the brightness of the surrounding pixels corresponding to the center of the view field micro-partition (4-2), and the brightness of the image unit is obtained.
11. The detection method according to claim 10, wherein the step S101 is specifically:
the pixels of the measured image are divided into zones at unequal intervals in the radial direction by concentric rings according to the proportional relation of the reciprocal density of cone photoreceptor cells of the fovea in the center of the retina of the human eye, and the division is carried out in the circumferential direction of each ring according to the radial width of the ring; the field angle corresponding to the field-of-view micro-area (4-2) is a plane angle of 1/60 degree to 1/120 degree, and the field angle corresponding to the field-of-view micro-area (4-2) away from the central area is gradually increased; the corresponding image unit brightness is calculated by the accumulated average of the pixel brightness contained in the view field micro-partition (4-2); the spectral transmittance of the optical filter (3), the spectral transmittance of the imaging lens (2) and the spectral response of the photoelectric image sensor (4), and the combined relative spectral response is consistent with the photopic vision spectral optical efficiency function of human eyes;
or, in the step S101, specifically:
the pixels of the measured image are divided from the center to the periphery according to the proportional relation of reciprocal density of the retina photoreceptor cells of the human eye according to an approximate hexagonal shape, and the pixels are divided into a series of visual field micro-regions (4-2) of approximate hexagonal shapes; the area of a visual field micro-partition (4-2) which is approximate to a hexagonal prism is consistent with the reciprocal of the density of cone photoreceptor cells at the fovea and the periphery of the retina of a human eye; furthermore, the center of the measurement image is a prismatic visual field micro-area (4-2), and the corresponding visual field angle is a plane angle of 1/60 degree to 1/120 degree; the field angle corresponding to the view field micro-area (4-2) away from the central area is gradually increased; the image unit luminance is calculated from the cumulative average of the pixel luminance signals involved on the corresponding field of view micro-regions (7-2).
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| US20120182278A1 (en) * | 2011-01-17 | 2012-07-19 | Dolby Laboratories Licensing Corporation | Methods and Apparatus for Estimating Light Adaptation Levels of Persons Viewing Displays |
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