WO2020042570A1 - 基于激光光源成像系统、其调制方法及存储介质 - Google Patents

基于激光光源成像系统、其调制方法及存储介质 Download PDF

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Publication number
WO2020042570A1
WO2020042570A1 PCT/CN2019/076653 CN2019076653W WO2020042570A1 WO 2020042570 A1 WO2020042570 A1 WO 2020042570A1 CN 2019076653 W CN2019076653 W CN 2019076653W WO 2020042570 A1 WO2020042570 A1 WO 2020042570A1
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Prior art keywords
projection image
image
projection
imaging system
light source
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English (en)
French (fr)
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郭祖强
鲁宁
李屹
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3161—Modulator illumination systems using laser light sources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3179—Video signal processing therefor

Definitions

  • the present invention relates to the technical field of optical imaging systems, and in particular to a laser light source-based imaging system, a modulation method thereof, and a storage medium.
  • An optical modulator is usually provided in the optical imaging system.
  • the illumination light field emitted by the laser light source is modulated by the optical modulator to form a projected image.
  • the quality of the optical modulator directly affects the display effect of the projected image.
  • Optical modulators usually consist of multiple reflective or transmissive optical components. The parameters or status of each optical component will affect the projected image. When the reflectance or transmittance of an optical component is different from other optical components, the As a result, the projected image has uneven brightness or color unevenness, which affects the display effect of the projected image. Therefore, when an optical modulator is used in an imaging system, it is preferred to detect whether the optical modulator can reach the standard used.
  • the present invention provides a laser light source imaging system, a modulation method thereof, and a storage medium.
  • the modulation method of the laser light source imaging system of the present invention can make the modulation in the imaging system more convenient.
  • the present invention provides a modulation method based on a laser light source imaging system, the modulation method includes:
  • the first projection image does not meet a projection requirement, determining a defective pixel from the first projection image according to the first image characteristic;
  • the present invention provides an imaging system based on a laser light source.
  • the imaging system includes:
  • a camera configured to capture the projection image to obtain a first projection image
  • the processing terminal is configured to acquire the first projection image captured by the camera, and execute the foregoing modulation method of the imaging system.
  • the present invention also provides a storage medium that stores program data that is executed to implement the modulation method of the imaging system described above; and / or the adjustment method of the imaging system described above.
  • the modulation method of the laser light source-based imaging system of the present invention obtains the first light field after the illumination light field emitted by the laser light source in the imaging system is modulated by the spatial light modulator in the imaging system. Projecting an image to obtain a first image characteristic of the first projection image; when determining that the first projection image does not meet projection requirements, modulating projection light corresponding to a defective pixel in the first projection image according to the first image characteristic This modulation process does not need to modulate other elements in the imaging system that are not related to the projection light, making the modulation process of the imaging system more convenient.
  • FIG. 1 is a schematic flowchart of a first embodiment of a modulation method based on a laser light source imaging system according to the present invention
  • FIG. 2 is a schematic flowchart of an embodiment of step S14 in FIG. 1;
  • step S14 in FIG. 1 is a schematic flowchart of another embodiment of step S14 in FIG. 1;
  • FIG. 4 is a schematic flowchart of a second embodiment of a modulation method based on a laser light source imaging system according to the present invention.
  • FIG. 5 is a schematic flowchart of a third embodiment of a modulation method based on a laser light source imaging system according to the present invention.
  • FIG. 6 is a schematic flowchart of a fourth embodiment of a modulation method based on a laser light source imaging system according to the present invention.
  • FIG. 7 is a schematic structural diagram of an embodiment of an imaging system according to the present invention.
  • FIG. 8 is a schematic structural diagram of another embodiment of an imaging system according to the present invention.
  • FIG. 9 is a schematic structural diagram of an embodiment of a storage medium according to the present invention.
  • FIG. 1 is a schematic flowchart of a first embodiment of a modulation method based on a laser light source imaging system according to the present invention.
  • the modulation method in this embodiment may include the following steps:
  • step S11 a first projection image of the illumination light field emitted by the laser light source in the imaging system after passing through the spatial light modulator in the imaging system is acquired, and a first image characteristic of the first projection image is obtained.
  • the illumination light field emitted by the laser light source is modulated by a spatial light modulator to form a modulated light field, and the modulated light field passes through a lens in the imaging system to form a first projection image on the screen;
  • the spatial light modulator can be a digital mirror device (DMD), a transmissive liquid crystal panel, or a reflective liquid crystal panel; and the imaging system can be a digital light processing (DLP) projection system or a liquid crystal (Liquid Crystal (Display, LCD) projection system.
  • DMD digital mirror device
  • DLP digital light processing
  • LCD liquid crystal
  • a modulated light path composed of multiple optical devices can be used to uniformize the illumination light field emitted by the laser light source.
  • the homogenization process can use a light homogenizing device, such as a square rod or compound eyes. You can also use other methods to uniformize the illumination light emitted by the laser light source.
  • the homogenized illumination light field is then modulated by a spatial light modulator to form a first projection image on the screen.
  • a camera is used to take a picture of the first projection image on the screen, and the first projection image obtained by taking the picture is transmitted to the processing terminal, and the processing terminal may obtain the corresponding first image characteristic from the first projection image.
  • the first image characteristic is an image characteristic of the first projection image formed by the illumination light field emitted by the laser light source after being modulated by the spatial light modulator
  • the first image characteristic can reflect the performance of the spatial light modulator, and thus determine the spatial light.
  • the performance of the spatial light modulator can be detected by analyzing the characteristics of the first image, and the spatial light modulator can be modulated according to the detection situation.
  • step S12 it is determined whether the first projection image meets a projection requirement.
  • the acquired first image characteristic is compared with a preset image characteristic requirement to determine whether the first image characteristic meets the image characteristic requirement, and a corresponding judgment result is obtained. If the first image characteristic does not meet the image characteristic requirements, it is determined that the first projection does not want to meet the projection requirements, and then the subsequent steps are further performed to modulate the image light corresponding to the first projection image to avoid imaging in the laser light source
  • the projected image obtained in the system does not display well. If the determination result is that the first projection image does not meet the projection requirement, step S13 is continued; if the determination result is that the first projection image meets the projection requirement, the modulation step does not need to be continued and the process ends.
  • step S13 a defective pixel is determined from the first projection image according to the first image characteristic.
  • step S12 If the determination result of step S12 is that the first projection image does not meet the projection requirements, there is a case where the image distribution is uneven in the first projection image in the specification, in other words, there is uniform brightness distribution and / or color distribution of some pixels in the first projection image. Non-uniform, so that these pixels with uniform brightness distribution and / or color distribution are defective pixels, and the defective pixels are identified in the first projection image, wherein the identified defective pixels may include at least the display characteristics of the defective pixels and the defective pixels. Position in the first projected image.
  • step S14 the projection light corresponding to the defective pixel is modulated according to the first image characteristic.
  • the projection light corresponding to the defective pixel is adjusted according to the first image characteristic, so that the display characteristics of the defective pixel and the display characteristics of other pixels tend to Consistent.
  • This modulation process does not need to modulate other components of the imaging system that are not related to the projection light, making the modulation process of the imaging system more convenient.
  • the spatial light modulator may be modulated by means of electronic correction compensation according to the phenomenon of unevenness of the first projected image; as shown in FIG. 2, at this time, step S14 may include the following steps:
  • step S14a1 a modulation amount difference between the modulation amount of the defective pixel and the modulation amount of the other pixels of the first projection image by the spatial light modulator is obtained.
  • the modulation amount of the spatial light modulator can be divided into reflectance or transmittance according to the properties of the spatial light modulator.
  • the modulation amount of each pixel by the spatial light modulator is the same, the brightness distribution and / or color distribution of the projected image formed on the screen is uniform.
  • the modulation amount of one or more of the reflective or transmissive sub-elements is different from the modulation of other reflective or transmissive sub-elements, the color of some pixels in the obtained image relative to other pixels and / Or there is a difference in brightness, resulting in uneven brightness and / or color distribution of the image.
  • the modulation amount of the defective pixel by the spatial light modulator and the modulation amount of the defective pixel and other pixels by the spatial light modulator can be obtained.
  • the modulation difference according to the position, display characteristics, and other information of the defective pixel obtained in step S13, the modulation amount of the defective pixel by the spatial light modulator and the modulation amount of the defective pixel and other pixels by the spatial light modulator can be obtained. The modulation difference.
  • step S14a2 the spatial light modulator is modulated according to the modulation amount difference.
  • the modulation spatial light modulator can be used to correct the defect.
  • the modulation amount of the pixel makes the modulation amount of the defective pixel by the spatial light modulator the same as that of the other pixels, that is, according to the difference between the modulation amount of the spatial light modulator and the modulation amount of the defective pixel by the spatial light modulator. , Changing the modulation amount of the defective pixel by the spatial light modulator, so that the modulation amount of the defective pixel by the spatial light modulator is consistent with the modulation amount of the other pixel by the spatial light modulator.
  • the modulation amount may be a brightness modulation amount.
  • the modulation amount difference value is a brightness modulation amount difference value.
  • the spatial light modulator is modulated according to the modulation amount difference value, and the projection light corresponding to the defective pixel is modulated. Of brightness.
  • the modulation amount of the spatial light modulator for the defective pixel is the first modulation amount
  • the modulation amount of the other pixels is the second modulation amount.
  • the difference between the first modulation amount and the second modulation amount That is, the modulation amount difference between the modulation amounts of the other pixels of the first projection image.
  • the spatial light modulator and the defect can be changed.
  • the modulation amount of the sub-element corresponding to the pixel is the same as that of other pixels, so that the projection image of the imaging system is modulated, and a projection image with better display quality is obtained.
  • step S14 may include the following steps:
  • step S14b1 the illumination light field is divided according to the position of the defective pixel to obtain the area illumination light field where the defective pixel is generated after the division.
  • the illumination light field emitted by the laser light source is divided, and according to the position of the defective pixel in the first projection image, the area illumination light field where the defective pixel is generated may be determined from the divided multiple area illumination light fields, so that In the step, the illumination light field of the area where the defective pixel is generated is modulated.
  • step S14b2 the modulation area illuminates the light field.
  • the area illumination light field corresponding to the defective pixel is obtained by modulating the area illumination light field where the defective pixel is generated.
  • the area illumination light field can be modulated according to the brightness according to the parameters included in the first image characteristic.
  • the distribution modulates the area illumination light field of the laser light source, and modulates the area illumination light field of the laser light source according to the color distribution.
  • the method for modulating the area illumination light field in this embodiment includes a light emitter array method or a method of adding a light modulator in front of the spatial light modulator, which is not specifically limited in this embodiment.
  • the first image characteristics may include brightness characteristics and color characteristics
  • correspondingly determining that the first projection image does not meet the projection requirements may include that the brightness distribution of the first projection image does not satisfy the brightness distribution requirements and / or the first projection image
  • the color distribution does not meet the color distribution requirements. Therefore, according to the first embodiment of the modulation method based on the laser light source imaging system shown in FIG. 1 to FIG. 3, further improvement can be made according to the specific situation that the first projection image does not meet the projection requirements.
  • FIG. 4 is a schematic flowchart of a second embodiment of a modulation method based on a laser light source imaging system according to the present invention.
  • the modulation method in this embodiment may include the following steps:
  • step S21 a first projection image of the illumination light field emitted by the laser light source in the imaging system after passing through the spatial light modulator in the imaging system is obtained, and a first image characteristic of the first projection image is obtained.
  • Step S21 in this embodiment is the same as step S11 shown in FIG. 1, and details are not described herein again.
  • step S22 according to the first image characteristic, an illuminance value of each pixel in the first projection image, an average illuminance value of the first projection image, and an illuminance difference contrast value of the first projection image are obtained.
  • the illuminance value of an image refers to the luminous flux of visible light received per unit area on the image.
  • the illuminance value is also a characteristic quantity of the image brightness.
  • the brightness value the illuminance value / beam angle.
  • the first projection image is composed of The illumination light field emitted by one lens is formed, so the beam angle is the same for the first projected image.
  • the average value of the illuminance of the first projection image is calculated from the illuminance value and the number of pixels of each pixel in the first projection image, and the average value of the illuminance characterizes the brightness distribution of the first projection image.
  • the contrast value of the illuminance difference is a common parameter that is usually used to determine whether the overall brightness distribution of the image is uniform.
  • the illuminance value and the number of pixels of each pixel in the first projection image are obtained, and the average illuminance of the first projection image can be calculated.
  • the contrast value of the illuminance difference of the first projection image can be calculated according to the following formula:
  • N is the number of pixels in the first projection image
  • x k represents the illuminance value of each pixel in the first projection image
  • ⁇ is the average illuminance of the first projection image.
  • step S23 it is determined whether the illuminance value of each pixel, the illuminance average value of the first projection image, and the illuminance difference contrast value satisfy the brightness distribution condition.
  • a brightness distribution condition is preset, and the illuminance value of each pixel obtained in step S22, the average illuminance value of the first projection image, and the contrast value of the illuminance difference are compared with the preset brightness distribution condition, and then the first Whether the brightness distribution of a projected image meets the brightness distribution in the requirements of image characteristics. If the determination result is that the brightness distribution of the first projection image meets the brightness distribution in the image characteristic requirements, the process is terminated; if the determination result is that the brightness distribution of the first projection image does not meet the brightness distribution in the image characteristic requirements, the subsequent steps continue to be performed .
  • This embodiment determines whether there is a local brightness unevenness in the first projection image by comparing the illuminance value of each pixel with the average value of the illuminance, and whether the overall brightness unevenness in the first projection image exists through the contrast value of the illuminance difference. Make judgments.
  • the obtained illuminance value of each pixel is compared with the average illuminance value of the first projection image, and if the absolute value of the difference between the illuminance value of each pixel and the average illuminance value is less than the first preset difference value, It means that there is no local brightness unevenness in the first projection image. If the absolute value of the difference between the illuminance value and the average illuminance value of one or more pixels in the first projection image is greater than or equal to the first preset difference value , It means that the brightness of the one or more pixels has a large brightness difference compared to other pixels, and the first projection image has a phenomenon of local brightness unevenness at the one or more pixels.
  • the calculated contrast value of the illuminance difference is compared with a second preset difference value. If the contrast value of the illuminance difference is smaller than the second preset difference value, it is considered that the first projection image has no overall brightness unevenness; if the illuminance difference is different If the contrast value is greater than or equal to the second preset difference value, it is considered that there is an overall uneven brightness phenomenon in the first projection image.
  • the brightness distribution conditions of this embodiment include: the absolute value of the difference between the illuminance value and the illuminance average value of each pixel is less than the first preset difference value, and the contrast value of the illuminance difference is less than the second preset difference value; that is, only When both conditions are satisfied, the brightness distribution of the first projection image is considered to satisfy the brightness distribution condition. As long as any one of the conditions is not satisfied, the brightness distribution of the first projection image is not considered to satisfy the brightness distribution condition.
  • both the first preset difference and the second preset difference can be set according to actual conditions, and this embodiment does not specifically limit.
  • the second preset difference may be 2%, and of course, the second preset difference may be set to a value such as 3%, 5%, or 7% according to the actual situation.
  • step S24 a brightness difference value between the brightness of a defective pixel in the first projection image and the brightness of other pixels in the first projection image is obtained.
  • the defective pixels in the first projection image are further obtained by using the first image characteristics.
  • the defective pixel at this time refers to a pixel with uneven brightness distribution in the first projection image. According to the above steps, the position of the defective pixel and the difference in brightness between the defective pixel and other pixels can be obtained.
  • step S25 the area illumination light field is modulated according to the brightness difference value.
  • the area illumination light field corresponding to the defective pixel is adjusted, so that the brightness of the defective pixel and the brightness of the other pixels tend to be consistent, so that the first projection image Meet projection needs.
  • the illumination light spot corresponding to the defective pixel can be calculated by using the area illumination light field where the defective pixel is generated. It can be understood that the sizes and light intensities of the illumination spots corresponding to the defective pixels are different from the sizes and light intensities of the illumination spots corresponding to other pixels, which results in the generation of defective pixels. Therefore, after finding the illumination spot corresponding to the defective pixel, the size and light intensity of the illumination spot corresponding to the defective pixel can be adjusted by using the brightness difference value between the defective pixel and other pixels obtained in step S24, so as to The uneven brightness is adjusted.
  • the above-mentioned modulation process is exemplified as follows: when the illumination light field emitted by the laser light source is a uniform illumination light field, its brightness is a, and the spatial light modulator modulates light (or transmission) of other pixels except for defective pixels.
  • the ratio of the light received by the lens is b, then the brightness obtained by the projected image is a * b; at this time, due to the abnormality of the defective pixel, the illumination light field corresponding to the defective pixel is changed to c by the lens, so corresponding to this
  • the other pixels are the same, which means that the uneven brightness distribution of the projected image is eliminated by modulating the laser light source.
  • FIG. 5 is a schematic flowchart of a third embodiment of a modulation method based on a laser light source imaging system according to the present invention.
  • the modulation method in this embodiment may include the following steps:
  • step S31 a first projection image of the illumination light field emitted by the laser light source in the imaging system after passing through the spatial light modulator in the imaging system is acquired, and a first image characteristic of the first projection image is obtained.
  • Step S31 in this embodiment is the same as step S11 shown in FIG. 1, and details are not described herein again.
  • step S32 the color coordinates of each pixel of the first projection image are calculated based on the first image characteristics.
  • the color coordinate is the color coordinate.
  • the color coordinate is the coordinate point of the color on the chromaticity diagram, and the coordinate can accurately represent the color. Therefore, in this embodiment, the color coordinate of each pixel in the first projection image is used to compare the first Determine whether the color distribution of the projected image meets the color distribution conditions.
  • the color coordinate of a pixel is related to the color tristimulus value of the pixel, and the relationship is as follows:
  • x is the abscissa of the color coordinate of the pixel
  • y is the ordinate of the color coordinate of the pixel
  • X, Y, and Z are the three stimulus values of red, green, and blue among the three color stimulus values of the pixel.
  • the three primary color image signal values (R, G, B) of each pixel in the first projection image are first obtained through the first projection image, and the three primary color image signal values of each pixel are the gray level of the pixel.
  • the maximum value is 255; in addition, the coordinates of the three primary colors of the image captured by the camera are obtained according to the color gamut of the camera that captured the first projected image (the color coordinates of the three primary colors are determined by the color gamut of the camera, not in the first projected image).
  • the tristimulus values of red, green, and blue among the tristimulus values of the pixels in the first projection image can be calculated by the following formula:
  • the three-color stimulus values of X W , Y W , and Z W white light.
  • the color tristimulus value (X, Y, Z) of each pixel in the first projection image can be calculated, and then the color coordinates (x, y) of each pixel are calculated.
  • step S33 it is determined whether the difference between the color coordinates of each pixel and the color coordinates of the light source is greater than a third preset difference.
  • the color coordinates of each pixel in the first projection image can represent the color of the corresponding pixel.
  • the numerical position reflects the position of the color of each pixel in the chromaticity diagram.
  • the first projection image is the illumination light field emitted by the laser light source. It is formed that if the color distribution of the first projection image is uniform, the color coordinates of each pixel in the first projection image should theoretically be close to the color coordinates of the laser light source. Therefore, in this embodiment, each color calculated in step S32 is The color coordinates of the pixels are compared with the color coordinates of the laser light source, respectively, and the relationship between the difference between the color coordinates of each pixel and the color coordinates of the laser light source and the third preset difference is determined.
  • the difference between the color coordinates of one or more pixels and the color coordinates of the laser light source is greater than or equal to the third preset difference, it means that the color distribution of the first projection image does not meet the color distribution conditions, and the first projection image If there is a color unevenness at the pixel, the subsequent steps are performed. If the difference between the color coordinate of each pixel and the color coordinate of the laser light source is less than the third preset difference, the first projection image is described. The color distribution meets the color distribution conditions, and the first projection image has no color unevenness. At this time, the process ends.
  • the first preset difference value, the second preset difference value, and the third preset difference value can be set according to actual conditions, and this embodiment is not specifically limited.
  • step S34 the three primary color image signal values of the image of the area illumination light field corresponding to the defective pixel before modulation are acquired according to the first image characteristic.
  • the three primary image signal value is the gray level of the three primary colors of the image corresponding to the area illumination light field, which represents the brightness of the three primary colors in the image.
  • the maximum value is 255.
  • step S35 the three primary color image signal values required for the image of the area illumination light field corresponding to the defective pixel are calculated.
  • the three primary color image signal values required for the image refer to the three primary color image signal values that the image corresponding to the defective pixel should have when the image does not have color unevenness. In other words, the area corresponding to the defective pixel needs to be illuminated by the light field.
  • the three-primary-color image signal value of the image is adjusted to the required three-primary-color image signal value, so that the color unevenness of the first projection image can be modulated.
  • step S36 the difference value of the three primary color image signals is calculated based on the three primary color image signal values before modulation and the required three primary color image signal values, and the area illumination light field is modulated based on the three primary color image signal differences.
  • the three primary color image signal difference values can be calculated.
  • the illumination light field of the area where the defective pixel is generated is modulated according to the calculated difference value of the three primary color image signals, so that the value of the three primary color image signal of the image in which the defective pixel is modulated is the required three primary color image signal Value to adjust the color unevenness of the first projected image.
  • the color tristimulus values of the defective pixels and the color tristimulus values of other pixels on the first projection image captured by the camera are calculated.
  • the difference between the color tristimulus values between the two is ( ⁇ X, ⁇ Y, ⁇ Z).
  • the color tristimulus value of the light source is (X ', Y', Z '). If the color tristimulus value of the modulated illumination light is (X 0 , Y 0 , Z 0 ), then the color tristimulus value of the illumination light is Calculated as:
  • the color coordinates of the corresponding three primary colors are: (x r , y r ), (x g , y g ), (x b , y b ), which can be calculated according to the following formula
  • the illumination light field of the laser light source is the three primary color image signal values (r, g, b):
  • Y r , Y g , and Y b can be calculated by the following formula:
  • the three-color stimulus values of X W , Y W , and Z W white light.
  • the imaging system can be adjusted by using the first image characteristic of the first projection image formed by the imaging system, so that the image characteristic of the first projection image can meet the image characteristic requirements.
  • the first projection image does not meet the projection requirements, it may be that its brightness distribution does not meet the brightness distribution requirements, and the color distribution does not meet the color distribution requirements.
  • the modulation methods shown in FIG. 4 and FIG. 5 may be performed. The combination constitutes a new embodiment.
  • FIG. 6 is a schematic flowchart of a fourth embodiment of a modulation method of an imaging system of the present invention.
  • the modulation method in this embodiment may include the following steps:
  • step S41 the imaging system of the laser light source is pre-processed.
  • Every optical device in the imaging system including the laser light source, will affect the image characteristics of the first projection image formed. Therefore, before the spatial light modulator is detected, the imaging system needs to be pre-processed to exclude the imaging system. The influence of other optical devices except the spatial light modulator on the first image characteristic of the first projection image.
  • preprocessing the imaging system of the laser light source may be: acquiring a second projection image of the illumination light field emitted by the laser light source that is not modulated by the device under test, and the imaging system does not place a spatial light modulator at this time, At this time, the second projection image formed on the screen by the illumination light field emitted by the laser light source is not modulated by the spatial light modulator, and the image characteristics of the second projection image are only affected by the imaging system except the spatial light modulator. Other optics are not affected by the spatial light modulator.
  • the image characteristics of the second projection image are recorded, so that the spatial light modulator modulator is placed in the imaging system of the laser light source in a subsequent step.
  • the first image characteristic of the first projection image can be obtained by removing the image characteristic of the second projection image from the acquired original image characteristics of the first projection image. At this time, the first image characteristic is only subjected to spatial light modulation. Effect.
  • preprocessing the imaging system of the laser light source may be: when it is determined that the image characteristics of the acquired second projection image do not meet the image characteristic requirements, the imaging system is divided according to the second image characteristics. Other optical devices outside the spatial light modulator perform modulation. In this way, after the spatial light modulator modulator is placed in the imaging system of the laser light source in the subsequent steps, the original image characteristics of the obtained first projection image are not affected by other optical devices than the spatial light modulator.
  • the original image characteristic of a projected image is the first image characteristic.
  • other optical devices in the imaging system include a laser light source, a modulated light path, and / or a lens.
  • step S42 a first projection image obtained by illuminating a light field emitted by a laser light source in the imaging system and modulated by a spatial light modulator in the imaging system is acquired to obtain a first image characteristic of the first projection image.
  • step S43 it is determined whether the first projection image meets a projection requirement.
  • step S44 a defective pixel is determined from the first projection image according to the first image characteristic.
  • step S45 the projection light corresponding to the defective pixel is modulated according to the first image characteristic.
  • steps S42 to S45 may be the same as the execution contents of steps S11 to S14 shown in FIG. 1.
  • the method of modulating the projection light corresponding to the defective pixel in step S45 please refer to FIG. 2 and FIG. 3 modulation method.
  • Steps S44 and S45 can be referred to steps S22 to FIG. 4
  • the modulation method in step S25 or the modulation methods in steps S32 to S35 shown in FIG. 5 are referred to.
  • FIG. 7 is a schematic structural diagram of an embodiment of an imaging system of the present invention.
  • the imaging system 100 of this embodiment includes a laser light source 101 and a screen 105 placed on the light path of the laser light source 101.
  • the spatial light modulator 103 is placed between the laser light source 101 and the screen 105.
  • the laser light source 101 After the emitted illumination light field is modulated by the spatial light modulator 103, it passes through the lens 104 to form a projection image on the screen 105.
  • the camera 106 is configured to capture a projection image to obtain a first projection image.
  • the processing terminal 107 is connected to the camera 106 and is configured to acquire a first projection image captured by the camera 106 and execute a modulation method of the imaging system of the laser light source shown in FIG. 1 to FIG.
  • a modulation method of the imaging system of the laser light source shown in FIG. 1 to FIG. For specific implementation contents of the modulation method of the system, refer to the description of the first to fourth embodiments of the modulation method of the imaging system shown in FIG. 1 to FIG. 6, and details are not described herein again.
  • the imaging system 100 of this embodiment may further include a modulation light path 102 composed of a plurality of optical devices.
  • the modulation light path 102 is disposed between the laser light source 101 and the spatial light modulator 103 and is used to emit light to the laser light source 101.
  • the illumination light field is homogenized.
  • the homogenization process may use a homogenization device, such as a square rod or a compound eye.
  • the illumination light emitted by the laser light source 101 may be homogenized by other methods.
  • the homogenized illumination light field is then modulated by the spatial light modulator 103 to form a first projection image on the screen 105.
  • FIG. 8 is a schematic structural view of another embodiment of the imaging system of the present invention.
  • the imaging system 200 of this embodiment includes a laser light source 201 and a screen 205 placed on the light path of the laser light source 201.
  • a spatial light modulator 203 is placed between the laser light source 201 and the screen 205. After the emitted illumination light field is modulated by the spatial light modulator 203, it passes through the lens 204 to form a projection image on the screen 205.
  • the camera 206 is configured to capture a projection image to obtain a first projection image.
  • the processing terminal 207 is connected to the camera 206, and is configured to acquire a first projection image captured by the camera 206, and execute a modulation method of the imaging system shown in FIGS. 1 to 6 according to the first to fourth embodiments, the modulation of the imaging system.
  • a modulation method of the imaging system shown in FIGS. 1 to 6 according to the first to fourth embodiments, the modulation of the imaging system.
  • the imaging system 200 of this embodiment may further include a modulated optical path 202 composed of multiple optical devices.
  • the modulated optical path 202 is disposed between the laser light source 201 and the spatial light modulator 203, and is configured to illuminate the light field emitted by the laser light source 201.
  • the homogenization is performed, and a homogenization device such as a square rod or a compound eye may be used in the process of homogenization.
  • the illumination light emitted by the laser light source 201 may be uniformized by other methods.
  • the homogenized illumination light field is then modulated by the spatial light modulator 203 to form a first projection image on the screen 205.
  • the imaging system 200 of this embodiment further includes a hardware processing circuit 208, which is connected to the processing terminal 207, the laser light source 201, and the spatial light modulator 203, respectively, for determining the spatial light at the processing terminal 207.
  • a hardware processing circuit 208 which is connected to the processing terminal 207, the laser light source 201, and the spatial light modulator 203, respectively, for determining the spatial light at the processing terminal 207.
  • the present invention also discloses an embodiment of a storage medium.
  • the storage medium in this embodiment stores program data.
  • the storage medium 300 may include at least one storage block 31, and the program data is stored in at least one storage block, respectively. 31, or stored in a partial storage block 31.
  • the program data can be executed to implement the first to fourth embodiments of the modulation method of the imaging system as shown in FIGS. 1 to 6, which will not be repeated here.
  • the storage medium in this embodiment may be a U disk, a network disk, a storage hard disk, a terminal, a server, or other devices having a storage function.

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Abstract

本发明公开了基于激光光源成像系统、其调制方法及存储介质。该成像系统的调制方法包括获取成像系统中的激光光源出射的照明光场经过所述成像系统中的空间光调制器调制后的第一投影图像，得到所述第一投影图像的第一图像特性；在判断得到所述第一投影图像不满足投影需求时，根据所述第一图像特性调制第一投影图像中缺陷像素对应的投影光。通过上述的成像系统的调制方法，使得对成像系统的调制过程更加便捷。

Description

基于激光光源成像系统、其调制方法及存储介质 技术领域
本发明涉及光学成像系统技术领域，具体而言涉及基于激光光源成像系统、其调制方法及存储介质。
背景技术
在光学成像系统中通常设置有光学调制器，激光光源出射的照明光场经过光学调制器的调制形成投影图像，其中，光学调制器的质量直接影响投影图像的显示效果。
光学调制器通常有多个反射或透射的光学部件构成，每个光学部件的参量或状态都会对投影图像造成影响，当某个光学部件与其他光学部件的反射率或透射率不同时，则会造成投影图像出现亮度不均匀或颜色不均匀的情况，使得投影图像的显示效果受到影响，因此在成像系统中使用光学调制器时优先对光学调制器是否能够到达使用的标准而进行检测。
发明内容
有鉴于此，本发明提供基于激光光源成像系统、其调制方法及存储介质，本发明的激光光源成像系统的调制方法能够使在成像系统的调制更加便捷。
为实现上述目的，本发明提供一种基于激光光源成像系统的调制方法，所述调制方法包括：
获取所述成像系统中激光光源出射的照明光场经过所述成像系统中的空间光调制器后的第一投影图像，并得到所述第一投影图像的第一图像特性；
判断所述第一投影图像是否满足投影需求；
若所述第一投影图像不满足投影需求，则根据所述第一图像特性从 所述第一投影图像中确定缺陷像素；
根据所述第一图像特性调制所述缺陷像素对应的投影光。
另一方面，本发明提出了一种基于激光光源的成像系统，所述成像系统包括：
激光光源，以及放置在所述激光光源出光路径上的屏幕，空间光调制器放置在所述激光光源和所述屏幕之间，所述激光光源出射的照明光场经过所述空间光调制器调制后，在所述屏幕上形成投影图像；
相机，用于对所述投影图像进行拍摄得到第一投影图像；
处理终端，用于获取所述相机拍摄到的所述第一投影图像，并执行上述的成像系统的调制方法。
另一方面，本发明还提出了一种存储介质，该存储介质存储有程序数据，所述程序数据被执行以实现上述的成像系统的调制方法；和/或上述的成像系统的调节方法。
有益效果：区别于现有技术，本发明的基于激光光源的成像系统的调制方法通过获取成像系统中的激光光源出射的照明光场经过所述成像系统中的空间光调制器调制后的第一投影图像，得到所述第一投影图像的第一图像特性；在判断得到所述第一投影图像不满足投影需求时，根据所述第一图像特性调制第一投影图像中缺陷像素对应的投影光，该调制过程不需要对成像系统中与投影光不相关的其他元件进行调制，令对成像系统的调制过程更加便捷。
附图说明
图1是本发明基于激光光源成像系统的调制方法第一实施例的流程示意图；
图2是图1中步骤S14的一实施方式的流程示意图；
图3是图1中步骤S14的另一实施方式的流程示意图；
图4是本发明基于激光光源成像系统的调制方法第二实施例的流程示意图；
图5是本发明基于激光光源成像系统的调制方法第三实施例的流程示意图；
图6是本发明基于激光光源成像系统的调制方法第四实施例的流程示意图；
图7是本发明成像系统一实施例的结构示意图；
图8是本发明成像系统另一实施例的结构示意图；
图9是本发明存储介质一实施例的结构示意图。
具体实施例
为使本领域的技术人员更好地理解本发明的技术方案，下面结合附图和具体实施方式对本发明做进一步详细描述。显然，所描述的实施方式仅仅是本发明的一部分实施方式，而不是全部的实施方式。基于本发明中的实施方式，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施方式，均属于本发明保护的范围。
请参阅图1，图1是本发明基于激光光源成像系统的调制方法第一实施例的流程示意图。如图1所示，本实施例的调制方法可包括如下步骤：
在步骤S11中，获取成像系统中的激光光源出射的照明光场经过成像系统中的空间光调制器后的第一投影图像，并得到第一投影图像的第一图像特性。
在成像系统中，激光光源出射的照明光场经过空间光调制器的调制，形成调制后的光场，调制后的光场经过成像系统中的镜头，在屏幕上形成第一投影图像；本实施例中空间光调制器可以为数字微镜阵列(Digital Mirror Device，DMD)、透射式液晶板或反射液晶板；而成像系统可以是数字光处理(Digital Light Procession，DLP)投影系统或液晶(Liquid Crystal Display，LCD)投影系统。
进一步，在激光光源后可以通过由多个光学器件组成的调制光路，调制光路对激光光源发出的照明光场进行均匀化，均匀化的过程可以使用匀光器件，例如方棒或复眼等；此外，也可以采用其他方式对激光光源发出的照明光进行均匀化。均匀化后的照明光场再通过空间光调制器的调制，在屏幕上形成第一投影图像。
本实施例中，利用相机对屏幕上的第一投影图像进行拍照，并将拍 照得到的第一投影图像传输给处理终端，处理终端则可以从第一投影图像中获取相应的第一图像特性，由于第一图像特性是由激光光源发出的照明光场经过空间光调制器的调制后形成的第一投影图像的图像特性，因此第一图像特性可以体现空间光调制器的性能，进而确定空间光调制器是否满足图像投影需求，换言之，可以通过对第一图像特性进行分析进而对空间光调制器的性能进行检测，并根据检测情况对空间光调制器进行调制。
在步骤S12中，判断所述第一投影图像是否满足投影需求。
将获取到的第一图像特性与预设的图像特性要求进行比较，以判断第一图像特性是否满足图像特性要求，得到相应的判断结果。如果第一图像特性不满足图像特性要求，则确定第一投影不想不满足投影需求，则进一步执行后续步骤，对第一投影图像对应的图像光进行调制进行调制，以避免在基于激光光源的成像系统中得到的投影图像的显示效果不佳。若判断结果为第一投影图像不满足投影需求，则继续执行步骤S13；若判断结果为第一投影图像满足投影需求，则不需要继续执行调制步骤，而结束流程。
在步骤S13中，根据第一图像特性从第一投影图像中确定缺陷像素。
若步骤S12的判断结果为第一投影图像不满足投影需求，则说明书第一投影图像中存在图像分布不均匀的情况，换言之，第一投影图像中存在部分像素的亮度分布均匀和/或颜色分布不均匀，令这些亮度分布均匀和/或颜色分布不均匀的像素为缺陷像素，在第一投影图像中确定出缺陷像素，其中，确定出缺陷像素至少可包括确定缺陷像素的显示特性以及缺陷像素在第一投影图像中的位置。
在步骤S14中，根据第一图像特性调制缺陷像素对应的投影光。
在本实施例中，当判断结果为第一投影图像不满足投影需求时，根据第一图像特性调整上述的缺陷像素对应的投影光，进而令缺陷像素的显示特性与其他像素的显示特性趋于一致。该调制过程不需要对成像系统的其他与投影光不相关的元件进行调制，令对成像系统的调制过程更加便捷。
进一步，在一实施方式中，根据第一投影图像的不均匀的现象可采 用电子矫正补偿的方式对空间光调制器进行调制；如图2所示，此时，步骤S14可包括如下步骤：
在步骤S14a1中，获取空间光调制器对缺陷像素的调制量和对第一投影图像的其他像素的调制量之间的调制量差值。
可以理解的是，空间光调制器的调制量可以根据空间光调制器的性质分为反射率或透射率。在成像系统中，空间光调制器对每个像素的调制量相同时，在屏幕上形成的投影图像的亮度分布和/或颜色分布为均匀的，若构成空间光调制器的多个反射子元件或透射子元件中某一个或几个反射子元件或透射子元件的调制量与其他反射子元件或透射子元件的调制量不同，则会令得到的图像中部分像素相对于其他像素的颜色和/或亮度出现差异，导致图像的亮度分布和/或颜色分布出现不均匀的现象。
本实施例中，根据步骤S13得到的缺陷像素的位置、显示特性等信息，即可得到空间光调制器对缺陷像素的调制量，以及空间光调制器对缺陷像素和其他像素的调制量之间的调制量差值。
在步骤S14a2中，根据调制量差值调制空间光调制器。
根据上述描述，对于第一投影图像而言，正是因为空间光调制器对缺陷像素和其他像素的调制量之间存在调制量的差异，因此，此时可通过将调制空间光调制器对缺陷像素的调制量，令空间光调制器对缺陷像素的调制量和对其他像素的调制量相同，即根据空间光调制器对两者的调制量差值以及空间光调制器对缺陷像素的调制量，改变空间光调制器对缺陷像素的调制量，进而使得空间光调制器对缺陷像素的调制量与空间光调制器对其他像素的调制量一致。
本实施例中，调制量可以为亮度调制量，相应的，调制量差值为亮度调制量差值；此时，根据调制量差值调制空间光调制器，调制的是缺陷像素对应的投影光的亮度。
本实施例中，可令空间光调制器对缺陷像素的调制量为第一调制量，对其他像素的调制量为第二调制量，则第一调制量和第二调制量之间的差值即为对第一投影图像的其他像素的调制量之间的调制量差值。进一步，改变空间光调制器中与缺陷像素对应的子元件对该缺陷像素的调制 量在第一调制量的基础上加上或减去调制量差值，即可令空间光调制器中与缺陷像素对应的子元件的调制量与其他像素的调制量相同，进而使成像系统的投影图像得到调制，得到较好显示质量的投影图像。
进一步，在另一实施方式中可采用照明光场预调制的方法根据第一图像特性对空间光调制器进行调制；此时，请参阅图3，步骤S14可包括如下步骤：
在步骤S14b1中，根据缺陷像素的位置对照明光场进行分割，得到分割后产生缺陷像素的区域照明光场。
本实施例对激光光源出射的照明光场进行分割，根据缺陷像素在第一投影图像中的位置，可以从分割的多个区域照明光场中确定产生缺陷像素的区域照明光场，以在后续步骤中对产生缺陷像素的区域照明光场进行调制。
在步骤S14b2中，调制区域照明光场。
得到产生缺陷像素的区域照明光场，即可对与缺陷像素对应的区域照明光场进行调制，本实施例中根据第一图像特性包含的参量可以将对区域照明光场进行调制分为根据亮度分布对激光光源的区域照明光场进行调制，以及根据颜色分布对激光光源的区域照明光场进行调制。
本实施例中对区域照明光场进行调制的方法包括发光器阵列方法或在空间光调制器前增加一个光调制器的方法，本实施例不做具体限制。
进一步，本实施例中第一图像特性可包括亮度特性和颜色特性，相应的确定第一投影图像不满足投影需求可包括第一投影图像的亮度分布不满足亮度分布需求和/或第一投影图像的颜色分布不满足颜色分布需求。由此，根据图1至图3所示的基于激光光源成像系统的调制方法第一实施例，可根据第一投影图像不满足投影需求的具体情况做出进一步的改进。
请参阅图4，图4是本发明基于激光光源成像系统的调制方法第二实施例的流程示意图，本实施例是在第一投影图像不满足投影需求为第一投影图像的亮度分布不满足亮度分布需求时的成像系统的调制方法实施例。如图4所示，本实施例的调制方法可包括如下步骤：
在步骤S21中，获取成像系统中的激光光源出射的照明光场经过成 像系统中的空间光调制器后的第一投影图像，并得到第一投影图像的第一图像特性。
本实施例中的步骤S21与图1所示的步骤S11相同，此处不再赘述。
在步骤S22中，根据第一图像特性，获取第一投影图像中每个像素的照度值、第一投影图像的照度平均值以及第一投影图像的照度差异对比度值。
图像的照度值是指图像上单位面积所接受可见光的光通量，照度值也是图像亮度的一种表征量，其中，亮度值＝照度值/光束角度，在本实施例中第一投影图像是由同一个镜头出射的照明光场形成的，因此对第一投影图像而言光束角度相同。
可以通过第一投影图像的照度值来确定第一投影图像的亮度分布是否满足投影需求。此外，通过第一投影图像中每个像素的照度值和像素的数量计算得到第一投影图像的照度平均值，照度平均值表征第一投影图像的亮度分布情况。而照度差异对比度值则是通常用来判断图像的整体亮度分布是否均匀的常用参量。
因此，本实施例在确定第一投影图像的亮度分布不满足亮度分布条件时，获取第一投影图像中每个像素的照度值和像素的数量，即可计算得到第一投影图像的照度平均值，进一步根据每个像素的照度值、像素的数量和第一投影图像的照度平均值计算得到第一投影图像照度差异对比度值。
本实施例中，可根据如下公式计算第一投影图像照度差异对比度值：
Figure PCTCN2019076653-appb-000001
其中，N为第一投影图像中的像素的数量，x k表示第一投影图像中国每个像素的照度值，μ为第一投影图像的照度平均值。
在步骤S23中，判断每个像素的照度值、第一投影图像的照度平均值以及照度差异对比度值是否满足亮度分布条件。
本实施例中预设有亮度分布条件，将步骤S22中得到的每个像素的照度值、第一投影图像的照度平均值以及照度差异对比度值与预设的亮度分布条件进行比较，进而判断第一投影图像的亮度分布是否满足图像 特性要求中的亮度分布。若判断结果为第一投影图像的亮度分布满足图像特性要求中的亮度分布，则结束流程；若判断结果为第一投影图像的亮度分布不满足图像特性要求中的亮度分布，则继续执行后续步骤。
本实施例通过每个像素的照度值与照度平均值的比较对第一投影图像是否存在局部亮度不均匀的情况进行判断，通过照度差异对比度值对第一投影图像是否存在整体亮度不均匀的情况进行判断。
具体的，将获得的每个像素的照度值与第一投影图像的平均照度值进行比较，若每个像素的照度值与平均照度值的差值的绝对值均小于第一预设差值，则说明第一投影图像中无局部亮度不均匀的现象，若第一投影图像中的某一个或多个像素的照度值与平均照度值的差值的绝对值大于或等于第一预设差值，则说明该某一个或多个像素的亮度相对于其他像素而言，存在较大的亮度差异，第一投影图像在该某一个或多个像素处存在局部亮度不均匀的现象。
进一步，将计算得到的照度差异对比度值与第二预设差值进行比较，若照度差异对比度值小于第二预设差值，则认为第一投影图像无整体的亮度不均匀现象；若照度差异对比度值大于或等于第二预设差值，则认为第一投影图像存在整体的亮度不均匀现象。
换言之，本实施例的亮度分布条件包括：每个像素的照度值与照度平均值的差值的绝对值小于第一预设差值，且照度差异对比度值小于第二预设差值；即只有当两个条件均满足时，才认为第一投影图像的亮度分布满足亮度分布条件，只要有任意一个条件不满足，都认为第一投影图像的亮度分布不满足亮度分布条件。本实施例中，第一预设差值和第二预设差值均可根据实际情况进行设置，本实施例不做具体限制。通常情况下，第二预设差值可以为2％，当然也可以根据实际情况将第二预设差值设置为3％、5％或7％等数值。
在步骤S24中，获取第一投影图像中缺陷像素的亮度和第一投影图像中其他像素的亮度之间的亮度差异值。
当步骤S23的判断结果为像素的照度值、第一投影图像的照度平均值以及照度差异对比度值不满足亮度分布条件时，进一步利用第一图像特性获取到第一投影图像中的缺陷像素，此时的缺陷像素指的是第一投 影图像中亮度分布不均匀的像素，根据上述步骤可以得到缺陷像素的位置，以及该缺陷像素与其他像素之间的亮度差异值。
在步骤S25中，根据亮度差异值调制区域照明光场。
本实施例中，根据缺陷像素和其他像素之间的亮度差异值，调节与缺陷像素对应的区域照明光场，进而使缺陷像素的亮度与其他像素的亮度趋于一致，以令第一投影图像满足投影需求。
进一步的，本实施例在确定缺陷像素时，即可通过产生缺陷像素的区域照明光场计算出该缺陷像素对应的照明光斑。可以理解的是，缺陷像素对应的照明光斑的大小和光强与其他像素对应的照明光斑的大小和光强不同，而导致的缺陷像素的产生。因此，找到缺陷像素对应的照明光斑后即可通过步骤S24中得到的缺陷像素与其他像素之间的亮度差异值，调节缺陷像素对应的照明光斑的大小和光强，以对第一投影图像的亮度不均匀的现象进行调节。
对上述的调制过程举例说明：令激光光源出射的照明光场为均匀照明光场时，其亮度为a，空间光调制器对除缺陷像素外的其他像素对光进行反射(或透射)调制后镜头接收到的光的比率为b，那么投影图像得到的亮度为a*b；此时，由于缺陷像素存在异常，与缺陷像素对应的照明光场被镜头接收比率变为c，因此对应这一缺陷像素的照明光场的亮度需调节的量为(b/c)*a，进而使投影图像中对应于缺陷像素的点的亮度为(b/c)*a*c＝a*b，与其他像素相同，也就是说通过对激光光源的调制消除了投影图像的亮度分布不均匀现象。
请参阅图5，图5是本发明基于激光光源成像系统的调制方法第三实施例的流程示意图，本实施例是在第一投影图像不满足投影需求为第一投影图像的颜色分布不满足颜色分布需求时的成像系统的调制方法实施例。如图5所示，本实施例的调制方法可包括如下步骤：
在步骤S31中，获取成像系统中的激光光源出射的照明光场经过成像系统中的空间光调制器后的第一投影图像，并得到第一投影图像的第一图像特性。
本实施例中的步骤S31与图1所示的步骤S11相同，此处不再赘述。
在步骤S32中，根据第一图像特性，计算第一投影图像的每个像素 的色坐标。
色坐标即颜色的坐标，色坐标为颜色在色度图上的坐标点，而该坐标可以精确的表示颜色，因此本实施例中利用第一投影图像中的每个像素的色坐标对第一投影图像的颜色分布是否满足颜色分布条件进行判断。
像素的色坐标与该像素的颜色三刺激值相关，其关系如下：
Figure PCTCN2019076653-appb-000002
Figure PCTCN2019076653-appb-000003
其中，x为像素的色坐标的横坐标，y为像素的色坐标的纵坐标；X、Y、Z分别为像素的颜色三刺激值中红色、绿色、蓝色的三刺激值。
根据上述公式可知，计算第一投影图像中每个像素的色坐标需要先得到每个像素的颜色三刺激值。本实施例中，先通过第一投影图像获取第一投影图像中每个像素的三基色图像信号值(R，G，B)，每个像素的三基色图像信号值为像素的灰度等级，最大值为255；此外，根据拍摄第一投影图像的相机的色域得到该相机拍摄得到图像的三基色的坐标(该三基色的色坐标由相机的色域决定，而不是第一投影图像中的三基色的色坐标)，其中红色的色坐标为(x R，y R)，绿色的色坐标为(x G，y G)，蓝色的色坐标为(x B，y B)，根据如下公式即可计算得到第一投影图像中的像素的颜色三刺激值中红色、绿色、蓝色的三刺激值：
Figure PCTCN2019076653-appb-000004
上述公式中的Y R、Y G、Y B可如下公式计算得到：
Figure PCTCN2019076653-appb-000005
其中，X W、Y W、Z W白光的三颜色刺激值。
根据上述公式即可计算得到第一投影图像中每个像素的颜色三刺激值(X，Y，Z)，进而计算得到每个像素的色坐标(x，y)。
在步骤S33中，判断每个像素的色坐标与光源的色坐标之间的差值 是否大于第三预设差值。
第一投影图像中每个像素的色坐标可以表征相应像素的颜色，在数值上体现的是每个像素的颜色在色度图中的位置，而第一投影图像是激光光源发出的照明光场形成的，若第一投影图像的颜色分布均匀，则第一投影图像中的每个像素的色坐标理论上应接近激光光源的色坐标，因此，本实施例将步骤S32中计算得到的每个像素的色坐标分别与激光光源的色坐标进行比较，判断每个像素的色坐标与激光光源的色坐标之间的差值与第三预设差值的关系。
若某一个或多个像素的色坐标与激光光源的色坐标之间的差值大于或等于第三预设差值，则说明第一投影图像的颜色分布不满足颜色分布条件，第一投影图像在该像素处存在颜色不均匀的现象，则继续执行后续步骤；若每个像素的色坐标与激光光源的色坐标之间的差值均小于第三预设差值，则说明第一投影图像的颜色分布满足颜色分布条件，第一投影图像无颜色不均匀的现象，此时则结束流程。
本实施例中，第一预设差值、第二预设差值以及第三预设差值均可根据实际情况进行设置，本实施例不做具体限制。
在步骤S34中，根据第一图像特性，获取缺陷像素对应的区域照明光场的图像在调制前的三基色图像信号值。
获取缺陷像素对应的区域照明光场在调节之前的三基色图像信号值，三基色图像信号值即为区域照明光场对应的图像的三基色的灰度等级，表征了图像中三基色的亮度，最大值为255。
在步骤S35中，计算缺陷像素对应的区域照明光场的图像所需的三基色图像信号值。
图像所需的三基色图像信号值指的是图像不存在颜色不均匀现象时，缺陷像素所对应部分的图像应当具有的三基色图像信号值，换言之，需要将缺陷像素对应的区域照明光场的图像的三基色图像信号值调整至所需的三基色图像信号值，即可实现对第一投影图像的颜色不均匀现象的调制。
在步骤S36中，根据调制前的三基色图像信号值与所需的三基色图像信号值计算三基色图像信号差值，根据三基色图像信号差值调制区域 照明光场。
根据步骤S34和步骤S35中得到的调节前缺陷像素对应的图像的三基色图像信号值以及所需的三基色图像信号值，即可计算得到三基色图像信号差值。本实施例中，根据计算得到的三基色图像信号差值对产生缺陷像素的区域照明光场进行调制，令调制后的缺陷像素所在的图像的三基色图像信号值为所需的三基色图像信号值，以实现对第一投影图像的颜色不均匀的调节。
本实施例中对与缺陷像素对应的区域照明光场的调制计算过程如下：
通过相机拍摄的第一投影图像上的缺陷像素的颜色三刺激值以及其他像素的颜色三刺激值，计算两者之间的颜色三刺激值之差为(ΔX，ΔY，ΔZ)，调制前激光光源的颜色三刺激值为(X'，Y'，Z')，令调制后的照明光的颜色三刺激值为(X 0，Y 0，Z 0)，则照明光的颜色三刺激值的计算为：
X 0＝X'+ΔX；Y 0＝Y'+ΔY；Z 0＝Z'+ΔZ；
在成像系统的色域下，得到相应的三基色的色坐标分别为：(x r，y r)、(x g，y g)、(x b，y b)，根据如下公式即可计算得到激光光源的照明光场是三基色图像信号值(r，g，b)：
Figure PCTCN2019076653-appb-000006
其中，Y r、Y g、Y b的值可通过如下公式计算得到：
Figure PCTCN2019076653-appb-000007
其中，X W、Y W、Z W白光的三颜色刺激值。
通过上述的成像系统的调节方法，可以通过成像系统形成的第一投影图像的第一图像特性，对成像系统进行调节，令第一投影图像的图像特性满足图像特性需求。
进一步，第一投影图像不满足投影需求也可能是同时存在其亮度分布不满足亮度分布需求，且颜色分布也不满足颜色分布需求，此时，可将图4和图5所示的调制方法进行结合，构成新的实施例。
请参阅图6，图6是本发明成像系统的调制方法第四实施例的流程示意图。如图6所示，本实施例的调制方法可包括如下步骤：
在步骤S41中，对激光光源的成像系统进行预处理。
在成像系统中包括激光光源在内的每个光学器件都会对形成的第一投影图像的图像特性造成影响，因此在对空间光调制器进行检测前需要对成像系统进行预处理，以排除成像系统中除空间光调制器以外的其他光学器件对第一投影图像的第一图像特性的影响。
进一步，在一实施方式中对激光光源的成像系统进行预处理可以为：获取激光光源出射的照明光场未经过待测元件调制的第二投影图像，此时成像系统不放置空间光调制器，此时，激光光源出射的照明光场在屏幕上形成的第二投影图像是未经过空间光调制器的调制的，第二投影图像的图像特性仅受到成像系统中除空间光调制器之外的其他光学器件的影响，而不会受到空间光调制器的影响。进一步，确定上述获取的第二投影图像的图像特性不满足图像特性要求时，记录第二投影图像的图像特性，如此在后续步骤中将空间光调制器调制器放置到激光光源的成像系统中后，可以通过从获取到的第一投影图像的原始图像特性中清除掉第二投影图像的图像特性，即可得到第一投影图像的第一图像特性，此时第一图像特性仅受到空间光调制器的影响。
进一步，在另一实施方式中，对激光光源的成像系统进行预处理可以为：在确定上述获取的第二投影图像的图像特性不满足图像特性要求时，根据第二图像特性对成像系统中除空间光调制器外的其他光学器件进行调制。如此在后续步骤中将空间光调制器调制器放置到激光光源的成像系统中后，得到的第一投影图像的原始图像特性不受空间光调制器之外的其他光学器件的影响，此时第一投影图像的原始图像特性即为上述第一图像特性。
本实施例中，成像系统中的其他光学器件包括激光光源、调制光路和/或镜头。
在步骤S42中，获取成像系统中的激光光源出射的照明光场经过成像系统中的空间光调制器调制后的第一投影图像，得到第一投影图像的第一图像特性。
在步骤S43中，判断所述第一投影图像是否满足投影需求。
在步骤S44中，根据第一图像特性从第一投影图像中确定缺陷像素。
在步骤S45中，根据第一图像特性调制缺陷像素对应的投影光。
本实施例中，步骤S42至步骤S45可分别与图1所示的步骤S11至步骤S14的执行内容相同，具体的，步骤S45对缺陷像素对应的投影光的调制方法可进一步参照图2和图3所示的调制方法。
进一步，根据第一投影图像不满足投影需求为第一投影图像的亮度分布不满足亮度分布需求或第一投影图像不满足颜色分布需求，步骤S44和步骤S45可参照图4所示的步骤S22至步骤S25的调制方法，或参照图5所示的步骤S32至步骤S35的调制方法。
进一步，参阅图7，图7是本发明成像系统一实施例的结构示意图。如图7所示，本实施例的成像系统100包括激光光源101，以及放置在激光光源101出光路径上的屏幕105，空间光调制器103放置在激光光源101和屏幕105之间，激光光源101出射的照明光场经过空间光调制器103调制后，通过镜头104，在屏幕105上形成投影图像。相机106用于对投影图像进行拍摄得到第一投影图像。处理终端107与相机106连接，用于获取相机106拍摄到的第一投影图像，并执行图1至图6所示的激光光源的成像系统的调制方法第一实施例至第四实施例，成像系统的调制方法的具体实施内容请参见图1至图6所示的成像系统的调制方法第一实施例至第四实施例的说明，此处不再赘述。
进一步，参阅图7，本实施例的成像系统100还可以包括多个光学器件组成的调制光路102，调制光路102设置在激光光源101与空间光调制器103之间，用于对激光光源101发出的照明光场进行均匀化，均匀化的过程可以使用匀光器件，例如方棒或复眼等，此外，也可以采用其他方式对激光光源101发出的照明光进行均匀化。均匀化后的照明光场再通过空间光调制器103的调制，在屏幕105上形成第一投影图像。
进一步，请参阅图8，图8是本发明成像系统另一实施例的结构示 意图。如图8所示，本实施例的成像系统200包括激光光源201，以及放置在激光光源201出光路径上的屏幕205，空间光调制器203放置在激光光源201和屏幕205之间，激光光源201出射的照明光场经过空间光调制器203调制后，通过镜头204，在屏幕205上形成投影图像。相机206用于对投影图像进行拍摄得到第一投影图像。处理终端207与相机206连接，用于获取相机206拍摄到的第一投影图像，并执行图1至图6所示的成像系统的调制方法第一实施例至第四实施例，成像系统的调制方法的具体实施内容请参见图1至图6所示的成像系统的调制方法第一实施例至第四实施例的说明，此处不再赘述。
此外，本实施例的成像系统200还可以包括多个光学器件组成的调制光路202，调制光路202设置在激光光源201与空间光调制器203之间，用于对激光光源201发出的照明光场进行均匀化，均匀化的过程可以使用匀光器件，例如方棒或复眼等，此外，也可以采用其他方式对激光光源201发出的照明光进行均匀化。均匀化后的照明光场再通过空间光调制器203的调制，在屏幕205上形成第一投影图像。
进一步，参阅图8，本实施例的成像系统200还包括硬件处理电路208，硬件处理电路208分别与处理终端207、激光光源201和空间光调制器203连接，用于在处理终端207确定空间光调制器203不满足投影需求时，执行图1至图6所示的激光光源的成像系统的调节方法第一实施例至第四实施例，此处不再赘述。
进一步，本发明还公开一存储介质实施例，本实施例中的存储介质存储有程序数据，如图9所示，存储介质300可包括至少一个存储块31，程序数据分别存储在至少一个存储块31中，或存储在部分存储块31中。程序数据能够被执行以实现如图1至图6所示的成像系统的调制方法第一实施例至第四实施例，此处不再赘述。
本实施例中的存储介质可为具有存储功能的U盘、网盘、存储硬盘、终端、服务器等装置。
以上仅为本发明的实施方式，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护 范围。

Claims (10)

  1. 一种基于激光光源成像系统的调制方法，其特征在于，包括：
    获取所述成像系统中激光光源出射的照明光场经过所述成像系统中的空间光调制器后的第一投影图像，并得到所述第一投影图像的第一图像特性；
    判断所述第一投影图像是否满足投影需求；
    若所述第一投影图像不满足投影需求，则根据所述第一图像特性从所述第一投影图像中确定缺陷像素；
    根据所述第一图像特性调制所述缺陷像素对应的投影光。
  2. 根据权利要求1所述的调节方法，其特征在于，所述根据所述第一图像特性调制所述缺陷像素对应的投影光，包括：
    获取所述空间光调制器对所述缺陷像素的调制量和对所述第一投影图像的其他像素的调制量之间的调制量差值；
    根据所述调制量差值调制所述空间光调制器，令所述空间光调制器对所述缺陷像素的调制量和对所述第一投影图像的其他像素的调制量相同。
  3. 根据权利要求1所述的调节方法，其特征在于，所述根据所述第一图像特性调制所述缺陷像素对应的投影光，包括：
    根据所述缺陷像素的位置对所述照明光场进行分割，得到分割后产生所述缺陷像素的区域照明光场；
    调制所述区域照明光场，以令所述第一投影图像满足投影需求。
  4. 根据权利要求3所述的调节方法，其特征在于，所述调制所述区域照明光场，包括：
    获取所述第一投影图像中所述缺陷像素的亮度和所述第一投影图像中其他像素的亮度之间的亮度差异值；
    根据所述亮度差异值调制所述区域照明光场。
  5. 根据权利要求3所述的调节方法，其特征在于，所述调制所述区域照明光场，包括：
    获取所述缺陷像素对应的区域照明光场的图像在调制前的三基色 图像信号值；
    计算所述缺陷像素对应的区域照明光场的图像所需的三基色图像信号值；
    根据所述调制前的三基色图像信号值与所述所需的三基色图像信号值计算三基色图像信号差值，根据所述三基色图像信号差值调制所述区域照明光场。
  6. 根据权利要求1所述的调制方法，其特征在于，
    在所述获取所述成像系统中激光光源出射的照明光场经过所述成像系统中的空间光调制器后的第一投影图像之前，还包括：
    对所述激光光源成像系统进行预处理，以排除所述空间光调制器以外的其他光学元件对所述第一投影图像的影响。
  7. 根据权利要求1所述的调制方法，其特征在于，
    所述判断所述第一投影图像是否满足投影需求，包括：
    获取所述第一投影图像中每个像素的照度值、所述第一投影图像的照度平均值以及所述第一投影图像的照度差异对比度值；
    判断所述每个像素的照度值、所述第一投影图像的照度平均值以及所述照度差异对比度值是否满足亮度分布条件；
    其中，所述亮度分布条件包括：所述每个像素的照度值与所述照度平均值的差值的绝对值小于第一预设差值，且所述照度差异对比度值小于第二预设差值。
  8. 根据权利要求6所述的调制方法，其特征在于，
    所述判断所述第一投影图像是否满足投影需求，包括：
    计算所述第一投影图像的每个像素的色坐标；
    判断所述每个像素的色坐标与激光光源的色坐标之间的差值是否大于第三预设差值。
  9. 一种基于激光光源的成像系统，其特征在于，包括：
    激光光源，以及放置在所述激光光源出光路径上的屏幕，空间光调制器放置在所述激光光源和所述屏幕之间，所述激光光源出射的照明光场经过所述空间光调制器调制后，在所述屏幕上形成投影图像；
    相机，用于对所述投影图像进行拍摄得到第一投影图像；
    处理终端，用于获取所述第一投影图像，并执行权利要求1至8任意一项所述的成像系统调制方法。
  10. 一种存储介质，其特征在于，保持有程序数据，所述程序数据被执行以实现权利要求1至8任意一项所述的成像系统调制方法。
PCT/CN2019/076653 2018-08-27 2019-03-01 基于激光光源成像系统、其调制方法及存储介质 Ceased WO2020042570A1 (zh)

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