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Color sorting technology is a highly-synthesized one connected with light, electricity, gas, machine and image processing. Sorting systems based on DSP and FPGA have many advantages such as high precision, high processing rate, high integration level and low power consumption. It first introduces the hardware structure of the image sorting system, and then uses MATLAB simulation tool to research several images processing algorithms. Finally, it tests the programs of the sorting system on DSP and proposes the broken peanuts detection algorithm. In this way, the selection of peanuts according to the size of damaged area is achieved. Except the detection of damaged peanuts, the target of peanuts screening also includes the size of peanuts. Based on the above, it puts forward the calculation method about the geometric parameters of peanuts.