May 2018
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2 Reads
Chung-kuo Tsao Chih/China Pulp and Paper
Aiming at the problems of the light-source noise in the process of paper defeats collection,the paper analyzed the characteristics of the light source noise and proposes a de-noising Algorithm based on holomorphic filtering and DCT transform. Firstly, blocking the image; then, taking logarithm operation and DCT transform of each image block and transforming them to frequency domain. Next, Gaussian holomorphic filteringused to remove noise interference. Finally, IDCT transform and exponential operation are used to restore them to the spatial domain. The experimental results showed that the algorithm could effectively remove various kinds of light-source noise and enhance the paper defect area. © 2018, China National Pulp and Paper Research Institute(CNPPRI). All right reserved.