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Method and system for detecting image quality of optical system, and testing target plate

A technology of optical system and test target, applied in the field of optics, can solve problems such as inability to accurately measure products, and achieve fast speed, high efficiency, and good repetition rate

Active Publication Date: 2017-04-26
GOERTEK OPTICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method and system for detecting the image quality of an optical system and a test target to solve the problem that the existing evaluation scheme for the image quality of an optical system is only based on theoretical evaluation and cannot be accurately measured for products in actual production The problem

Method used

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  • Method and system for detecting image quality of optical system, and testing target plate
  • Method and system for detecting image quality of optical system, and testing target plate
  • Method and system for detecting image quality of optical system, and testing target plate

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Embodiment 1

[0025] figure 1 It is a schematic structural diagram of a system for detecting the image quality of an optical system provided by an embodiment of the present invention, as shown in figure 1 As shown, the system for detecting the image quality of an optical system provided in this embodiment includes: a standard object 110 , an image acquisition unit 120 , and an image analysis unit 130 .

[0026] The standard object 110 is placed at the focal length of the object side of the optical system. The standard object 110 can include a test target plate and a surface light source. The test target plate is located between the surface light source and the optical system to be tested. Under the illumination of the surface light source, the test target plate Display graphics for measuring various optical parameters of the optical system; the standard object 110 can also be a display screen with a driving circuit, and the driving circuit drives the display screen to display graphics for m...

Embodiment 2

[0033] figure 2 is a schematic diagram of a test target provided by an embodiment of the present invention, such as figure 2 As shown, the test target plate provided in this embodiment can display a graph of various optical parameters for testing the optical system under the illumination of a light source, and the graph includes multiple image features for measuring different optical parameters.

[0034] The figure displayed on the test target board is a rectangle with pure black as the background color, and is symmetrical with the horizontal centerline and vertical centerline of the rectangle.

[0035]The center and four corners of the rectangle are respectively provided with checkerboard areas for measuring the contrast of the optical system. In a specific embodiment, a white square is set in the center of the checkerboard area in the center of the rectangle, and 2*2 black and white squares are set in the checkerboard area at the four corners of the rectangle. The relati...

Embodiment 3

[0042] image 3 It is a flowchart of a method for detecting the image quality of an optical system provided by an embodiment of the present invention, such as image 3 As shown, the method for detecting the image quality of an optical system provided in this embodiment includes:

[0043] Step S310: Build a dark environment for detecting the image quality of the optical system to prevent external light from affecting the detection results.

[0044] Step S320: placing a standard object at the focal length of the object side of the optical system to be inspected, so that the light containing object information passes through the optical system to be inspected and becomes parallel light.

[0045] The standard object can be a display screen with a driving circuit, and the driving circuit drives the display screen to display graphics for measuring various optical parameters of the optical system; or, the standard object includes a test target plate and a surface light source, and t...

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Abstract

The invention discloses a method and a system for detecting image quality of an optical system, and a testing target plate. The system comprises a standard object, an image acquisition unit and an image analysis unit, wherein the standard object is located at the position of an object focal length of the detected optical system; the standard object is a display screen provided with a driving circuit, and the driving circuit drives the display screen to display a pattern used for measuring various kinds of optical parameters of the optical system; or the standard object comprises the testing target plate and an area light source, the testing target plate is positioned between the area light source and the detected optical system, and the testing target plate is used for displaying a pattern for measuring various kinds of optical parameters of the optical system under the irradiation of the area light source; the image acquisition unit is positioned on the image side of the optical system, and acquires an image of the standard object formed by the optical system through one shooting; and the image analysis unit obtains and analyzes the image acquired by the image acquisition unit, and obtains parameters reflecting the image quality of the optical system. Compared with the subjective evaluation of human eyes, the method and the system are objective and effective, have good repetition rate, and are suitable for batch detection.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a method and system for detecting the image quality of an optical system and a test target plate. Background technique [0002] There are more and more types of virtual reality products on the market, and the experience of end users is also uneven. Among the many factors affecting user experience, the imaging quality of the near-eye optical system will be the most important. Good imaging quality will bring users a strong sense of reality and immersion, and improve the quality of experience. [0003] Most of the existing evaluation schemes for optical system image quality are based on simulation software to evaluate the designed optical system in terms of MTF, point spread function, etc. This method is only based on theoretical evaluation and cannot be used for actual production products. Measure accurately. Contents of the invention [0004] The invention provides a method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02
CPCG01M11/00
Inventor 孙琦
Owner GOERTEK OPTICAL TECH CO LTD
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