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¹Ø¼ü´Ê£ºÍ¼Ïñ ѹËõ DCT matlab·ÂÕæ

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ͼÏñJPEGѹËõµÄmatlabʵÏÖ

Abstract

With the development of modern economy, the storm has swept through the image of our daily life, people have been closely related to the image for the. People's requirements on image real-time processing is relatively improved. Now we face a problem, how to guarantee the quality of the image, at the same time can be old enough considering the real-time and efficiency has become an issue of concern. This information is certain to image compression and processing has become a very important link. However, the image is an important signal, due to the large amount of data, while the storage and transmission of the compressed. New mathematical tools are discrete cosine transform is a new mathematical tool, based on the discrete cosine transform image compression technology is now being a lot of attention and research.

In this paper, based on the analysis of the general methods of image compression in recent years, the basic principles and implementation steps of image compression based on DCT transform are also discussed. In this paper, the principle and development of image compression are introduced briefly, and the DCT transform algorithm is analyzed and compared with other compression methods. The basis of DCT transform compression is proposed. The final step of the image compression process is to encode the quantized image. This. We use MATLAB6.5 to realize the simulation of JPEG image compression.

The simulation results show that using MATLAB to achieve the image discrete cosine transform compression method is simple, fast, small error advantages, greatly improves the efficiency and accuracy of image compression.

Keywords: DCT ,matlab,simulation image, compression

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ͼÏñJPEGѹËõµÄmatlabʵÏÖ

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ͼÏñJPEGѹËõµÄmatlabʵÏÖ ........................................................ I ÕªÒª .................................................................................................... I Abstract .......................................................................................... II Ŀ¼ ................................................................................................. III ǰÑÔ ................................................................................................... 1 1 Ð÷ÂÛ ............................................................................................... 3 1.1ÂÛÎÄÑо¿±³¾°¼°ÒâÒå ................................................................. 3 1.2 JPEGͼÏñµÄ·¢Õ¹ÀúÊ·¼°¼ò½é ................................................... 4 1.3 JPEGͼÏñÔÚDCTÖÐѹËõµÄ×÷Óà ............................................. 5 1.4 ±¾ÎÄÑо¿µÄÖ÷ÒªÄÚÈÝ ................................................................ 6 2 ͼÏñѹËõ±àÂëÔ­Àí ....................................................................... 7 2.1 DCT±ä»»µÄÀ´Ô´ ........................................................................ 7 2.2»ùÓÚDCTµÄJPEGͼÏñѹËõ±àÂë²½Öè .................................... 8 2.3ͼÏñѹËõ´¦Àí¼¼Êõ»ù±¾ÀíÂÛ ..................................................... 9 3 ͼÏñѹËõµÄMATLABʵÏÖ ........................................................... 12 3.1ÀëÉ¢ÓàÏұ任µÄ¶¨Òå¼°Ô­Àí ................................................... 12 3.2ÀëÉ¢ÓàÏұ任µÄË㷨ʵÏÖ ....................................................... 13 3.3ͼÐÎÓû§½çÃæ½éÉÜ ................................................................... 14 3.3.1ͼÏñÎļþ¶ÁÈ¡ ..................................................................... 15 3.3.2ͼÏñÎļþÊä³ö ..................................................................... 16 4 ÔËÐнá¹û¼°·ÖÎö ......................................................................... 18 4.1 ³ÌÐòÁ÷³Ìͼ .............................................................................. 18 4.2 MATLAB·ÂÕæ½á¹û.................................................................. 19 4.3 ʵÑé½á¹û¼°·ÖÎö ...................................................................... 20 ×ܽá ................................................................................................. 23

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ͼÏñJPEGѹËõµÄmatlabʵÏÖ

²Î¿¼ÎÄÏ× ......................................................................................... 25 ÖÂл ................................................................................................. 26 ¸½¼þ1 ͼÏñJPEGѹËõµÄmatlab³ÌÐò ........................................ 27

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