1, the image by respectively according to the quality grade 10, 30, 50, 70, 90 stored as JPG file, and respectively named Chrysanthemum_010. JPG, Chrysanthemum_030. JPG,... , Chrysanthemum_090. JPG. 2, observe and explain the change of quality JPG files. 3, calculate the compression ratio, and draw the curve of the compression ratio change with quality grade. 4, read the file: Chrysanthemum_010. JPG, Chrysanthemum_030. JPG,... , Chrysanthemum_090. JPG. 5, calculate the peak signal-to-noise ratio and draw the curve of the peak signal-to-noise ratio change with quality grades.

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