Moire quantitative evaluation method and device, electronic device, storage medium

A moire quantitative evaluation device, comprising:

• an obtaining circuit configured to obtain an image of a first pattern layer, wherein the first pattern layer is located on a light-exiting side of a second pattern layer, the first pattern layer comprises first image units arranged periodically, and the second pattern layer comprises second image units arranged periodically;
• a coordinate obtaining circuit configured to obtain coordinates of each of the first image units according to a viewing distance and an oblique viewing angle;
• a first determination circuit configured to, according to the coordinates of each of the first image units and a thickness and a refractive index of a dielectric layer disposed between the first pattern layer and the second pattern layer, determine coordinates of projection image units on the second pattern layer each of which corresponds to a corresponding one of the first image units along an oblique view light path;
• a second determination circuit configured to determine surrounding regions on the second pattern layer each of which surrounds one of the projection image units, and determining a pixel value of each of the projection image units according to pixel values of second image units in each of the surrounding regions to obtain an oblique view image, wherein the second determination circuit is further configured to:
• determine second image units adjacent to each of the projection image units on the second pattern layer which corresponds to a corresponding one of the first image units, and determine regions formed by the second image units as the surrounding regions;
• perform interpolation on pixel values of the second image units in each of the surrounding regions to obtaining the pixel value of each of the projection image units;
• and
• obtain the oblique view image based on the pixel values of the projection image units;
• a superimposing circuit configured to superimpose the image of the first pattern layer and the oblique view image to obtain a first superimposed image, wherein the superimposing circuit is further configured to:
• convert the oblique view image to a grayscale image;
• and
• multiply image data of the converted grayscale image and image data of the image of the first pattern layer to obtain the first superimposed image;
• a converting circuit configured to convert the first superimposed image into a moire image;
• and
• an evaluation circuit configured to perform a moire quantitative evaluation according to the moire image.

An electronic device, comprising:

• at least one hardware processor;
• and
• computer-readable instructions stored in memory and executable by the at least one hardware processor that, when executed by the at least one hardware processor, direct the at least one hardware processor to:
• obtain an image of a first pattern layer, wherein the first pattern layer is located on a light-exiting side of a second pattern layer, the first pattern layer comprises first image units arranged periodically, and the second pattern layer comprises second image units arranged periodically;
• obtain coordinates of each of the first image units according to a viewing distance and an oblique viewing angle;
• according to the coordinates of each of the first image units and a thickness and a refractive index of a dielectric layer disposed between the first pattern layer and the second pattern layer, determine coordinates of projection image units on the second pattern layer each of which corresponds to a corresponding one of the first image units along an oblique view light path;
• determine surrounding regions on the second pattern layer each of which surrounds one of the projection image units, and determining a pixel value of each of the projection image units according to pixel values of second image units in each of the surrounding regions to obtain an oblique view image by:
• determining second image units adjacent to each of the projection image units on the second pattern layer which corresponds to a corresponding one of the first image units, and determining regions formed by the second image units as the surrounding regions;
• performing interpolation on pixel values of the second image units in each of the surrounding regions to obtaining the pixel value of each of the projection image units;
• and
• obtaining the oblique view image based on the pixel values of the projection image units;
• superimpose the image of the first pattern layer and the oblique view image to obtain a first superimposed image by:
• converting the oblique view image to a grayscale image;
• and
• multiplying image data of the converted grayscale image and image data of the image of the first pattern layer to obtain the first superimposed image;
• convert the first superimposed image into a moire image;
• and
• perform a moire quantitative evaluation according to the moire image.