Multi-region Nonuniform Brightness Correction Algorithm Based on L-Channel Gamma Transform

Nonuniform brightness distribution of collimator reticle images leads to the recognition difficulty grids and coordinate scales on affects digitalization system. The article proposes an image quality improvement algorithm that operates L channel LAB color space perform correction. It designs four typical modules depending representative features. Corresponding correction models for all are constructed by designing new functions based nonlinear gamma transform. A concept similarity is defined automatic matching between region be processed. On this basis, can automatically adjust mode ensure each pixel tends uniform, which reflected in a visible distortion image. effectively reduce complexity model processing adaptively intensity according value. enables more accurate corrections with good results.