Dark level correction method and system based on brightness and temperature joint constraint

By combining a dark level correction method with brightness and temperature constraints in a CMOS sensor, the dark level drift problem was solved, and the stability of dark area brightness and the imaging quality were improved.

CN122372860APending Publication Date: 2026-07-10深圳森云智能科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
深圳森云智能科技有限公司
Filing Date
2026-04-21
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing dark level correction methods have failed to effectively address the dark level drift problem of CMOS sensors under long-term operation or temperature changes, resulting in unstable brightness and color shift in dark areas.

Method used

By acquiring operating temperature information in the field environment, and combining the dark level reference value in the brightness dimension and the dark level correction component in the temperature dimension, dark level correction parameters adapted to the current temperature conditions are generated, and dark level correction processing is performed.

Benefits of technology

It improves the stability of pixel levels in dark areas under different temperature conditions, reduces the probability of color shift in dark areas, and ensures image quality.

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Abstract

This invention provides a dark level correction method and system based on joint constraints of brightness and temperature, belonging to the field of image signal processing technology. The method includes: acquiring a current image frame in the field environment and obtaining the corresponding operating temperature information; determining dark level correction parameters corresponding to the operating temperature information based on a pre-set dark level reference value in the brightness dimension and a pre-set dark level correction component in the temperature dimension; generating a dark level correction value for the current image frame based on the dark level correction parameters; and applying the dark level correction value to the pixel data of the current image frame to complete the dark level correction process. This invention achieves stable suppression of dark level drift under different operating temperatures and continuous imaging conditions, thereby improving the brightness consistency of dark areas and reducing the probability of color cast in dark areas.
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