Design Of Glass Flaw's Image Acquisition And Process System Based On FPGA

All kinds of glass defect will occur during the melting production, such as airbladder, stria and concretiono. The precision of glass depends on where and how the products are used. Generally speaking, lots of obvious glass defect are not allowed which will reduce appearance quality, transparence, mechanical intensity and heat stability, and can bring plenty of wasters.Firstly, the current state of image collection and process systems were introduced, and then, the system's merits and demerits were compared separately which based on FPGA,DSP and ASIC , considering the background and demands of the project, the whole architecture of image collection and process system were brought forward which based on FPGA. In system, control logic module of peripheral interface,chips control logic module and algorithms module are all implemented by FPGA. And then, the solution that image pre-processing system in image detection system was detailedly introduced and FPGA subsystem was implemented which had the function of image capture and image pre-processing. The system used Alters Corporation's FPGA as the central processor. It was composed of image capture module, asynchronous FIFO module, image frame storing control module, image low-level processing module, communication module and FPGA configuration circuit. OV9121 takes charge of image collection controlled by FPGA, and the two SDRAM are image buffer storage, image collection and filter module is realized in the FPGA.The system consists of OV9121 initialization module, image collection control module, SDRAM control module. Initialization module configure OV9121's work mode, resolution, frame frequency which based on the system acquitment; Image collection control module provide control signal that OV9121 need when collecting image, SDRAM control module major answer for image data buffer and deliver these data to filter module.At the end of this article, the familiar image preprocess algorithms are introduced, including filters and edge detection of the image, summarize that the convolution algorithms is the most important algorithms of preprocess, finally, the convolution algorithms based on FPGA were introduced detailedly, then discuss optimization of scheme that FPGA realize the convolution algorithms, which cause the image process speed a big progess,and these improve the performance of the system.