Background suppression method and detecting device in automatic optical detection of display panel

The disclosure provides a background suppression method and a detecting device in automatic optical detection for a display panel, wherein the background suppression method includes the following steps: S1: collecting a pure color image of the display panel; S2: performing multi-level wavelet decomposition on the pure color image to obtain a series of high-frequency sub-bands and low-frequency sub-bands; S3: performing coefficient smoothing process on high-frequency sub-bands in multiple directions of each level, and performing contrast enhancement process on each level of low-frequency sub-bands; S4: the processed high-frequency sub-bands and the processed low-frequency sub-bands are subjected to wavelet reconstruction to obtain a defect image after background suppression. The disclosure performs multi-scale and multi-resolution decomposition on the image, and performs texture suppression and image enhancement on the decomposed high-frequency sub-bands and low-frequency sub-bands respectively, and can maintain the contrast of the original defect while suppressing the background texture.