圖象數(shù)據(jù)壓縮的DCT法
THE DCT METHOD FOR IMAGE DATA COMPRESSION
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摘要: 正 數(shù)字圖象的數(shù)據(jù)率很大,因此在傳輸和存貯圖象時(shí)必須考慮對(duì)圖象數(shù)據(jù)加以壓縮。壓縮的方法主要有兩大類,即預(yù)測(cè)編碼法和變換編碼法。變換編碼法又分最佳變換和準(zhǔn)最佳變換編碼法。由于最佳變換需要計(jì)算圖象的協(xié)方差矩陣及其特征向量和特征值,一般還沒有快速算法,所以很難付諸實(shí)用。因而常采用準(zhǔn)最佳變換。具有快速算法的準(zhǔn)最佳
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關(guān)鍵詞:
Abstract: A set of computation formulas of discrete cosine transform (DCT) for image data eompression is given. The results of simulation experiment show that the formulas are correct and consistent with the formulas given by W. K. Pratt (1978), but they are different slightly in form. -
R. C. Gonzalez and P. Wintz: Digital Image Processing, Addison-Wesley Publishing Company. 1977.[2]W. K. Pratt: Digital Image Processing, John Wiley and Sons, Inc. 1978.[3]W. Chen.[J].C. H. Smith and Fratick: A Fast Computational Algorithm for the Discrete Cosine Transform IEEE Trans. on COM, COM-25(1977.1004,:- -
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