A depth measurement method and system based on shallow depth of field imaging

Abstract

The present invention provides a depth measurement method based on shallow depth of field imaging and a corresponding system. The depth measurement method based on shallow depth of field imaging includes the following steps: obtaining the physical position of the best focus image of the liquid crystal layer; obtaining the location of the best focus image of the defect Physical position: determine the physical layer where the defect is located according to the difference between the physical position of the best focus image of the liquid crystal layer and the physical position of the best focus image of the defect. The present invention obtains the physical positions of the best focus image of the liquid crystal layer and the best focus image of the defect respectively, uses the best focus image of the liquid crystal layer as a reference plane, and determines the physical layer where the defect is located by calculating the difference between the two, and automatically detects When a defect occurs, the physical layer where the defect is located can be automatically located according to the physical position of the best focus image of the liquid crystal layer, thereby realizing the depth measurement function of the automatic detection device, which can solve the problem that the automatic detection device cannot realize the depth measurement function in the prior art .

Description

Technical field [0001] The invention relates to a detection method and system, in particular to a depth measurement method and system based on shallow depth of field imaging. Background technique [0002] The typical composition of LCD (Liquid Crystal Display) is TP (TouchPanel) glass, upper polarizer, color filter, liquid crystal layer, TFT (Thin Film Transistor) substrate, and lower polarizer from top to bottom. And the backlight. The basic principle of LCD display is to change the arrangement of the molecules inside the liquid crystal material through voltage, in order to achieve the purpose of shading and transmitting light to display different shades, patchwork images, and only need to add between two plates The ternary color filter layer can display color images. At present, LCD screens have become mainstream products in the domestic and foreign markets due to their energy saving, non-radiation, and soft screen. Therefore, the quality inspection of LCD screens has become ...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a depth measurement method and system based on shallow depth of field imaging to solve the problem that the automatic detection device in the prior art cannot realize the depth measurement function

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