A focus adjustment method, system and related apparatus

Abstract

This application discloses a focus adjustment method, system, and related apparatus for suppressing moiré pattern interference. The method includes: acquiring a sample image of a sample screen using a camera, and locating a real focus reference position based on the sample image using a preset focus algorithm; starting from the real focus reference position, acquiring a defocused image of the sample screen along the defocus direction according to a preset step size using the camera, and calculating the focus value; constructing a relationship model based on the focus value and the defocus distance; analyzing the rate of change of the focus value through the relationship model, and determining the target defocus position range by combining it with a preset change threshold; acquiring the current image of the screen under test using the camera within the target defocus position range, and calculating the current focus value; calculating the theoretical distance of the current focus value through the relationship model; obtaining the actual distance of the screen under test, and determining whether the difference between the theoretical distance and the actual distance exceeds a preset distance change threshold; if so, dynamically moving the camera to adjust the actual distance.

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