WO2020042570A1

WO2020042570A1 - Laser light source-based imaging system, modulation method therefor, and storage medium

Info

Publication number: WO2020042570A1
Application number: PCT/CN2019/076653
Authority: WO
Inventors: 郭祖强; 鲁宁; 李屹
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2018-08-27
Filing date: 2019-03-01
Publication date: 2020-03-05
Also published as: CN110868576A

Abstract

Disclosed are a laser light source-based imaging system, a modulation method therefor, and a storage medium. The modulation method for the imaging system comprises: obtaining a first projection image where an illumination light field emitted by the laser light source in the imaging system is modulated by a spatial optical modulator therein to obtain a first image feature of the first projection image; and when it is determined that the obtained first projection image does not meet the projection requirement, modulating, according to the first image feature, a projection light corresponding to an abnormal pixel in the first projection image. According to the modulation method for the imaging system, the process of modulating the imaging system is more convenient.

Description

Imaging system based on laser light source, its modulation method and storage medium

Technical field

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.

Background technique

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.

Summary of the Invention

In view of this, 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.

To achieve the above object, the present invention provides a modulation method based on a laser light source imaging system, the modulation method includes:

Acquiring a first projection image of an illumination light field emitted by a laser light source in the imaging system after passing through a spatial light modulator in the imaging system, and obtaining a first image characteristic of the first projection image;

Determining whether the first projection image meets a projection requirement;

If 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;

And modulating the projection light corresponding to the defective pixel according to the first image characteristic.

In another aspect, the present invention provides an imaging system based on a laser light source. The imaging system includes:

A laser light source, and a screen placed on the light path of the laser light source, a spatial light modulator is placed between the laser light source and the screen, and an illumination light field emitted by the laser light source is modulated by the spatial light modulator Forming a projection image on the screen;

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.

In another aspect, 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.

Advantageous effect: Different from the prior art, 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.

BRIEF DESCRIPTION OF THE DRAWINGS

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;

3 is a schematic flowchart of another embodiment of step S14 in FIG. 1;

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;

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;

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;

7 is a schematic structural diagram of an embodiment of an imaging system according to the present invention;

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.

Specific embodiment

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Please refer to FIG. 1, which 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. As shown in FIG. 1, the modulation method in this embodiment may include the following steps:

In 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.

In the imaging system, 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; this implementation In the example, 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.

Further, after the laser light source, 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.

In this embodiment, 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. Because 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. Whether the modulator meets the requirements of image projection, in other words, 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.

In 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.

In step S13, a defective pixel is determined from the first projection image according to the first image characteristic.

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.

In step S14, the projection light corresponding to the defective pixel is modulated according to the first image characteristic.

In this embodiment, when it is determined that the first projection image does not meet the projection requirements, 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.

Further, in an embodiment, 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:

In 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.

It can be understood that the modulation amount of the spatial light modulator can be divided into reflectance or transmittance according to the properties of the spatial light modulator. In the imaging system, when 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. Or 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.

In this embodiment, 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.

In step S14a2, the spatial light modulator is modulated according to the modulation amount difference.

According to the above description, for the first projected image, it is precisely because there is a difference in the modulation amount between the modulation amount of the defective pixel and the other pixels by the spatial light modulator. Therefore, at this time, 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.

In this embodiment, the modulation amount may be a brightness modulation amount. Correspondingly, the modulation amount difference value is a brightness modulation amount difference value. At this time, 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.

In this embodiment, the modulation amount of the spatial light modulator for the defective pixel is the first modulation amount, and the modulation amount of the other pixels is the second modulation amount. Then, 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. Further, by changing the modulation amount of the defective pixel by the sub-element corresponding to the defective pixel in the spatial light modulator by adding or subtracting the modulation amount difference from the first modulation amount, 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.

Further, in another embodiment, a method of pre-modulating the illumination light field may be used to modulate the spatial light modulator according to the first image characteristic; at this time, referring to FIG. 3, step S14 may include the following steps:

In 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.

In this embodiment, 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.

In 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. In this embodiment, 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.

Further, in this embodiment, the first image characteristics may include brightness characteristics and color characteristics, and 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.

Please refer to FIG. 4. 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. In this embodiment, when the first projection image does not meet the projection requirement, the brightness distribution of the first projection image does not meet the brightness. An embodiment of a modulation method for an imaging system when demand is distributed. As shown in FIG. 4, the modulation method in this embodiment may include the following steps:

In 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.

In 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. Among them, the brightness value = the illuminance value / beam angle. In this embodiment, 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.

Whether the brightness distribution of the first projection image meets the projection requirement can be determined by the illumination value of the first projection image. In addition, 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.

Therefore, in this embodiment, when it is determined that the brightness distribution of the first projection image does not satisfy the brightness distribution condition, 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. , Further calculating an illuminance difference contrast value of the first projection image according to the illuminance value of each pixel, the number of pixels, and the average value of the illuminance of the first projection image.

In this embodiment, the contrast value of the illuminance difference of the first projection image can be calculated according to the following formula:

Among them, 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 China, and μ is the average illuminance of the first projection image.

In 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.

In this embodiment, 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.

Specifically, 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.

Further, 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.

In other words, 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. In this embodiment, both the first preset difference and the second preset difference can be set according to actual conditions, and this embodiment does not specifically limit. Generally, 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.

In 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.

When the judgment result of step S23 is that the illuminance value of the pixel, the average illuminance value of the first projection image, and the contrast value of the illuminance difference do not satisfy the brightness distribution condition, 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.

In step S25, the area illumination light field is modulated according to the brightness difference value.

In this embodiment, according to the brightness difference value between the defective pixel and other pixels, 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.

Further, in this embodiment, when a defective pixel is determined, 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 amount of brightness of the illumination light field of the defective pixel needs to be adjusted as (b / c) * a, so that the brightness of the point corresponding to the defective pixel in the projected image is (b / c) * a * c = a * b, and 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.

Please refer to FIG. 5. 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. In this embodiment, when the first projection image does not meet the projection requirement, the color distribution of the first projection image does not meet the color. An embodiment of a modulation method for an imaging system when demand is distributed. As shown in FIG. 5, the modulation method in this embodiment may include the following steps:

In 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.

In 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:

Among them, x is the abscissa of the color coordinate of the pixel, and 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.

According to the above formula, it is known that to calculate the color coordinates of each pixel in the first projection image, a color tristimulus value of each pixel must be obtained first. In this embodiment, 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). Color coordinates of the three primary colors), where the red color coordinates are (x _R , y _R ), the green color coordinates are (x _G , y _G ), and the blue color coordinates are (x _B , y _B ), according to 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:

Y _R , Y _G , Y _B in the above formula can be calculated by the following formula:

Among them, the three-color stimulus values of X _W , Y _W , and Z _W white light.

According to the above formula, 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.

In 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.

If 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.

In this embodiment, 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.

In 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.

Obtain the three primary color image signal values of the area illumination light field corresponding to the defective pixel before adjustment. 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.

In 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.

In 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.

According to the three primary color image signal values of the image corresponding to the defective pixel before adjustment and the required three primary color image signal values obtained in steps S34 and S35, the three primary color image signal difference values can be calculated. In this embodiment, 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 modulation calculation process of the area illumination light field corresponding to the defective pixel in this embodiment is as follows:

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 (ΔX, ΔY, ΔZ). 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:

X ₀ = X '+ ΔX; Y ₀ = Y' + ΔY; Z ₀ = Z '+ ΔZ;

Under the color gamut of the imaging system, 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):

Among them, the values of Y _r , Y _g , and Y _b can be calculated by the following formula:

Through the above-mentioned adjustment method of the imaging system, 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.

Further, if 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. At this time, the modulation methods shown in FIG. 4 and FIG. 5 may be performed. The combination constitutes a new embodiment.

Please refer to FIG. 6, which is a schematic flowchart of a fourth embodiment of a modulation method of an imaging system of the present invention. As shown in FIG. 6, the modulation method in this embodiment may include the following steps:

In 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.

Further, in an embodiment, 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. Further, when it is determined that the image characteristics of the obtained second projection image do not meet the requirements of the image characteristics, 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.

Further, in another embodiment, 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.

In this embodiment, other optical devices in the imaging system include a laser light source, a modulated light path, and / or a lens.

In 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.

In step S43, it is determined whether the first projection image meets a projection requirement.

In step S44, a defective pixel is determined from the first projection image according to the first image characteristic.

In step S45, the projection light corresponding to the defective pixel is modulated according to the first image characteristic.

In this embodiment, steps S42 to S45 may be the same as the execution contents of steps S11 to S14 shown in FIG. 1. Specifically, for 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.

Further, according to the fact that the first projection image does not meet the projection requirement, the brightness distribution of the first projection image does not meet the brightness distribution requirement or the first projection image does not meet the color distribution requirement. 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.

Further, referring to FIG. 7, FIG. 7 is a schematic structural diagram of an embodiment of an imaging system of the present invention. As shown in FIG. 7, 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. 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.

Further, referring to FIG. 7, 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. In addition, 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.

Further, please refer to FIG. 8. FIG. 8 is a schematic structural view of another embodiment of the imaging system of the present invention. As shown in FIG. 8, 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. For specific implementation content of the method, refer to descriptions 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.

In addition, 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. In addition, 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.

Further, referring to FIG. 8, 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. When the modulator 203 does not meet the projection requirements, the first to fourth embodiments of the method for adjusting the imaging system of the laser light source shown in FIGS. 1 to 6 are performed, and details are not described herein again.

Further, the present invention also discloses an embodiment of a storage medium. The storage medium in this embodiment stores program data. As shown in FIG. 9, 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.

The above is only an embodiment of the present invention, and thus does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the description and drawings of the present invention, or directly or indirectly used in other related technical fields, All the same are included in the patent protection scope of the present invention.

Claims

A modulation method based on a laser light source imaging system, comprising:

Acquiring a first projection image of an illumination light field emitted by a laser light source in the imaging system after passing through a spatial light modulator in the imaging system, and obtaining a first image characteristic of the first projection image;

Determining whether the first projection image meets a projection requirement;

If the first projection image does not meet the projection requirements, determining a defective pixel from the first projection image according to the first image characteristic;

And modulating the projection light corresponding to the defective pixel according to the first image characteristic.
The adjustment method according to claim 1, wherein the modulating the projection light corresponding to the defective pixel according to the first image characteristic comprises:

Acquiring a modulation amount difference between the modulation amount of the defective pixel by the spatial light modulator and the modulation amount of other pixels of the first projection image;

Modulating the spatial light modulator according to the modulation amount difference, so that the spatial light modulator modulates the defective pixel with the same modulation amount as other pixels of the first projection image.
The adjustment method according to claim 1, wherein the modulating the projection light corresponding to the defective pixel according to the first image characteristic comprises:

Segmenting the illumination light field according to the position of the defective pixel to obtain an area illumination light field that generates the defective pixel after the segmentation;

Modulating the area illumination light field so that the first projection image meets a projection requirement.
The adjusting method according to claim 3, wherein the modulating the area illumination light field comprises:

Acquiring a brightness difference value between the brightness of the defective pixel in the first projection image and the brightness of other pixels in the first projection image;

Modulating the area illumination light field according to the brightness difference value.
The adjusting method according to claim 3, wherein the modulating the area illumination light field comprises:

Acquiring the three primary color image signal values of the image of the area illumination light field corresponding to the defective pixel before modulation;

Calculating the three primary color image signal values required for the image of the area illumination light field corresponding to the defective pixel;

Calculate a three-primary-color image signal difference according to the three-primary-color image signal value before the modulation and the required three-primary-color image signal value, and modulate the area illumination light field according to the three-primary-color image signal difference.
The modulation method according to claim 1, wherein:

Before acquiring the 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, the method further includes:

The laser light source imaging system is pre-processed to exclude the influence of other optical elements other than the spatial light modulator on the first projection image.
The modulation method according to claim 1, wherein:

The determining whether the first projection image meets a projection requirement includes:

Obtaining 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;

Determining whether the illuminance value of each pixel, the average illuminance value of the first projection image, and the illuminance difference contrast value satisfy a brightness distribution condition;

The brightness distribution condition includes: an absolute value of a difference between the illuminance value of each pixel and the illuminance average value is smaller than a first preset difference value, and the contrast value of the illuminance difference is smaller than a second preset difference value.
The modulation method according to claim 6, wherein:

The determining whether the first projection image meets a projection requirement includes:

Calculating a color coordinate of each pixel of the first projection image;

It is determined whether a difference between a color coordinate of each pixel and a color coordinate of the laser light source is greater than a third preset difference.
An imaging system based on a laser light source, comprising:

A laser light source, and a screen placed on the light path of the laser light source, a spatial light modulator is placed between the laser light source and the screen, and an illumination light field emitted by the laser light source is modulated by the spatial light modulator Forming a projection image on the screen;

A camera, configured to capture the projection image to obtain a first projection image;

A processing terminal is configured to acquire the first projection image and execute the imaging system modulation method according to any one of claims 1 to 8.
A storage medium, characterized in that program data is held, and the program data is executed to implement the imaging system modulation method according to any one of claims 1 to 8.