Chengzhi Deng
ABSTRACT
Discrete Cosine Transform (DCT) is a common method in image compression processing. In this method, the original image is first divided into several blocks for processing, and then the information of each pixel is converted to frequency coefficients, and a certain high frequency component is discarded, thus the image is lossy compressed. In this paper, the effect of block sizes on the quality of decompressed image is studied, so as to find out the optimal block sizes. Firstly, we make a theoretical analysis, and then verify my analysis results through experiment. In the experiment, the block sizes range from 1x1 to 512x512. We use different metrics to evaluate the image quality, including MSE, PSNR and SSIM.
- J. Mohta and K. kant Pathak, 'Image compression and gamma correction using DCT', 2015 International Conference on Futuristic Trends on Computational Analysis and Knowledge Management, 2015, pp. 322--326.Google Scholar
Cross Ref
- Wing-Kuen Ling and Bing Zeng, 'A novel method for blocking effect reduction in DCT-coded images', in ISCAS'99. Proceedings of the 1999 IEEE International Symposium on Circuits and Systems VLSI (Cat. No.99CH36349), 1999, vol. 4, pp. 46--49 vol.4.Google Scholar
- N. N. Ponomarenko, K. Egiazarian, V. V. Lukin, and J. T. Astola, 'Compression of image block means for non-equal block size partition schemes using Delaunay triangulation and prediction', in Proceedings DCC 2002. Data Compression Conference, 2002, pp. 468--474.Google ScholarCross Ref
- A. Almohammad and G. Ghinea, 'Stego image quality and the reliability of PSNR', in 2010 2nd International Conference on Image Processing Theory, Tools and Applications, 2010, pp. 215--220.Google ScholarCross Ref
- J. Pambrun and R. Noumeir, 'Limitations of the SSIM quality metric in the context of diagnostic imaging', in 2015 IEEE International Conference on Image Processing (ICIP), 2015, pp. 2960--2963.Google ScholarCross Ref
Index Terms
- Effect of Different Block Sizes on the Quality of JPEG-like Compressed Image
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