Image preprocessing system and method for increasing compression ratio of periodic texture image

Abstract

An image preprocessing system for increasing the compression ratio of a periodic texture image is designed in the invention. An image sampling module allows pixels with the same phase in each textureperiod in a display panel defect detection image containing a periodic texture to form a sample image and extracts multiple sample images corresponding to pixels of different phases in each texture period in the display panel defect detection image. A grid arrangement module carries out grid arrangement on the multiple sample images according to the phase positions of the sample images and forms areconstructed image with the same resolution as the display panel defect detection image. An image compression module performs lossy compression or lossless compression on the reconstructed image toobtain code stream data. The method has a high image compression ratio, and the storage and transmission of the texture images can be facilitated.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to an image preprocessing system and method for improving the compression ratio of periodic texture images. technical background [0002] During the automatic optical inspection process of the TFT (Thin Film Transistor, thin film transistor) array of the liquid crystal panel, it is necessary to take 10 to 30 lossless digital images with a resolution of 6576*4384 or 10000*7096. In the above optical inspection process, an area array camera is generally used Take lossless digital images, and then use JPEG-LS (Joint Photographic Experts Group-lossless) lossless compression to compress the captured lossless digital images for transmission and storage. However, since the resolution of the area scan camera is higher than that of the detected LCD panel , which leads to the images captured by the area scan camera containing strong periodic textures. During the JPEG-LS lossless compr...

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Problems solved by technology

[0002] During the automatic optical inspection process of the TFT (Thin Film Transistor, thin film transistor) array of the liquid crystal panel, it is necessary to take 10 to 30 lossless digital images with a resolution of 6576*4384 or 10000*7096. In the above optical inspection process, an area array camera is generally used Take lossless digital images, and then use JPEG-LS (Joint Photographic Experts Group-lossless) lossless compression to compress the captured lossless digital images for transmission and storage. However, since the resolution of the area scan camera is higher than that of the detected LCD panel , which leads to the images captured by the area array camera containing strong periodic textures. During the JPEG-LS lossless compression of images, these textures will greatly reduce the compression ratio, thereby increasing the storage capacity and transmission bandwidth requirements

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