WO2020042570A1 - Système d'imagerie à base de source de lumière laser, son procédé de modulation, et support de stockage - Google Patents

Système d'imagerie à base de source de lumière laser, son procédé de modulation, et support de stockage Download PDF

Info

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
Authority
WO
WIPO (PCT)
Prior art keywords
projection image
image
projection
imaging system
light source
Prior art date
Application number
PCT/CN2019/076653
Other languages
English (en)
Chinese (zh)
Inventor
郭祖强
鲁宁
李屹
Original Assignee
深圳光峰科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳光峰科技股份有限公司 filed Critical 深圳光峰科技股份有限公司
Publication of WO2020042570A1 publication Critical patent/WO2020042570A1/fr

Links

Images

Classifications

    • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

L'invention concerne un système d'imagerie à base de source de lumière laser, son procédé de modulation, et un support de stockage. Le procédé de modulation pour le système d'imagerie comprend : l'obtention d'une première image de projection dans laquelle un champ de lumière d'éclairage émis par la source de lumière laser dans le système d'imagerie est modulé par un modulateur optique spatial à l'intérieur de celui-ci pour obtenir une première caractéristique d'image de la première image de projection; et lorsqu'il est déterminé que la première image de projection obtenue ne satisfait pas l'exigence de projection, la modulation, selon la première caractéristique d'image, d'une lumière de projection correspondant à un pixel anormal dans la première image de projection. Selon le procédé de modulation pour le système d'imagerie, le processus de modulation du système d'imagerie est plus pratique.
PCT/CN2019/076653 2018-08-27 2019-03-01 Système d'imagerie à base de source de lumière laser, son procédé de modulation, et support de stockage WO2020042570A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201810980759.9 2018-08-27
CN201810980759.9A CN110868576A (zh) 2018-08-27 2018-08-27 基于激光光源成像系统、其调制方法及存储介质

Publications (1)

Publication Number Publication Date
WO2020042570A1 true WO2020042570A1 (fr) 2020-03-05

Family

ID=69642853

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2019/076653 WO2020042570A1 (fr) 2018-08-27 2019-03-01 Système d'imagerie à base de source de lumière laser, son procédé de modulation, et support de stockage

Country Status (2)

Country Link
CN (1) CN110868576A (fr)
WO (1) WO2020042570A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115713370A (zh) * 2022-11-23 2023-02-24 江门市搏进照明科技有限公司 一种基于物联网的智慧照明监测管理系统及方法
CN117676107B (zh) * 2024-01-31 2024-05-24 武汉中观自动化科技有限公司 图像激光投影方法以及激光投影设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2704170Y (zh) * 2004-06-22 2005-06-08 浙江大学 改善投影显示颜色均匀性装置
WO2008024802A2 (fr) * 2006-08-22 2008-02-28 Texas Instruments Incorporated Ouverture dynamique pour système de traitement de lumière
CN101243358A (zh) * 2005-08-23 2008-08-13 卡西欧计算机株式会社 投影设备和投影控制方法
CN106094405A (zh) * 2016-06-03 2016-11-09 海信集团有限公司 投影图像校正方法、装置和投影机

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200630921A (en) * 2005-02-24 2006-09-01 Amtran Technology Co Ltd Television and back lighting source module capable of preventing harmonic interference
JP5140869B2 (ja) * 2007-08-06 2013-02-13 株式会社リコー 画像投影方法および画像投影装置
CN106770361A (zh) * 2016-12-27 2017-05-31 昆山博威泰克电子科技有限公司 一种全自动屏幕光学检测设备与检测方法
CN107247384B (zh) * 2017-07-31 2020-07-03 歌尔股份有限公司 亮度补偿数据获取系统及方法、图像亮度调整方法及装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2704170Y (zh) * 2004-06-22 2005-06-08 浙江大学 改善投影显示颜色均匀性装置
CN101243358A (zh) * 2005-08-23 2008-08-13 卡西欧计算机株式会社 投影设备和投影控制方法
WO2008024802A2 (fr) * 2006-08-22 2008-02-28 Texas Instruments Incorporated Ouverture dynamique pour système de traitement de lumière
CN106094405A (zh) * 2016-06-03 2016-11-09 海信集团有限公司 投影图像校正方法、装置和投影机

Also Published As

Publication number Publication date
CN110868576A (zh) 2020-03-06

Similar Documents

Publication Publication Date Title
CN107018389B (zh) 图像投射系统、投影机及图像投射系统的控制方法
US6570623B1 (en) Optical blending for multi-projector display wall systems
US8045006B2 (en) Method and apparatus for determining the best blending of overlapped portions of projected images
CN112261392B (zh) 投影系统与其影像均匀度补偿方法
JP5396012B2 (ja) 投射前に画像を自動的に修正するシステム
US10681319B2 (en) Image projection system, projector, and method for controlling image projection system
JP4810944B2 (ja) 輝度むら及び／又は色むら補正データ算出方法、輝度むら及び／又は色むら補正方法及び表示装置
US9508281B2 (en) Apparatus and method for image analysis and image display
EP1573708A1 (fr) Procede pour ameliorer le contraste perceptif d'images affichees
JP2017208677A (ja) プロジェクター
US7457458B1 (en) Method and apparatus for defining and correcting image data
JP2015097350A (ja) 画像処理装置およびマルチプロジェクションシステム
WO2020042570A1 (fr) Système d'imagerie à base de source de lumière laser, son procédé de modulation, et support de stockage
TWI634792B (zh) 投影圖像調整方法及投影機
JPH0984036A (ja) 投写型ディスプレイ装置とこれを用いたマルチディスプレイ装置，マルチディスプレイシステム
US8031271B2 (en) Calibrating a projection system
CN115460386A (zh) 一种利用黑白相机获取彩色图像的方法及系统
JP6119155B2 (ja) 調光制御装置、画像表示装置、調光制御方法及びプログラム
JP4661576B2 (ja) 投写画像の位置調整方法
WO2020111164A1 (fr) Dispositif d'affichage, système d'affichage et procédé d'affichage d'image
US11245881B2 (en) Method and apparatus for correcting color convergence error
JPH06105185A (ja) 輝度補正方法
JP2007329591A (ja) 輝度及び色度測定における校正方法
JP3520752B2 (ja) 液晶パネルの検査装置及び液晶パネルの検査方法、並びに投射型表示装置
US11798445B2 (en) Image processing apparatus having light-shielding plate, projection-type display apparatus, image processing method, and storage medium to correct luminance or color of image signal

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19853342

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19853342

Country of ref document: EP

Kind code of ref document: A1