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Ȩ Ȩ > ¿¬±¸¹®Çå > ±¹³» ³í¹®Áö > Çѱ¹Á¤º¸Åë½ÅÇÐȸ ³í¹®Áö (Journal of the Korea Institute of Information and Communication Engineering)

Çѱ¹Á¤º¸Åë½ÅÇÐȸ ³í¹®Áö (Journal of the Korea Institute of Information and Communication Engineering)

Current Result Document :

ÇѱÛÁ¦¸ñ(Korean Title) ÀÌ»êÄÚ»çÀκ¯È¯ ±â¹Ý À̹ÌÁö ¾ÐÃà ¾Ë°í¸®Áò¿¡ °üÇÑ À籸¼º
¿µ¹®Á¦¸ñ(English Title) Rebuilding of Image Compression Algorithm Based on the DCT (discrete cosine transform)
ÀúÀÚ(Author) ³²¼öÅ   ÁøÂù¿ë   Soo-Tai Nam   Chan-Yong Jin  
¿ø¹®¼ö·Ïó(Citation) VOL 23 NO. 01 PP. 0084 ~ 0089 (2019. 01)
Çѱ۳»¿ë
(Korean Abstract)
JPEGÀº °¡Àå ³Î¸® »ç¿ëµÇ´Â À̹ÌÁö ¾ÐÃà Ç¥ÁØ ±â¼úÀÌ´Ù. º» ³í¹®¿¡¼­´Â JPEG À̹ÌÁö ¾ÐÃà ¾Ë°í¸®ÁòÀ» ¼Ò°³ÇÏ°í ¾ÐÃà ¹× ¾ÐÃà ÇØÁ¦ÀÇ °¢ ´Ü°è¸¦ ¼­¼úÇÏ°íÀÚ ÇÑ´Ù. À̹ÌÁö ¾ÐÃàÀº µðÁöÅÐ À̹ÌÁö¸¦ µ¥ÀÌÅÍ ¾ÐÃàÀ» Àû¿ëÇÏ´Â °úÁ¤ÀÌ´Ù. ÀÌ»êÄÚ»çÀκ¯È¯Àº ½Ã°£ µµ¸ÞÀο¡¼­ ÁÖÆļö µµ¸ÞÀÎÀ¸·Î º¯È¯ÇÏ´Â ±â¼úÀÌ´Ù. ¸ÕÀú, À̹ÌÁö´Â 8 by 8 Çȼ¿ ºí·ÏÀ¸·Î ºÐÇÒÇÏ°Ô µÈ´Ù. µÑ°, À§¿¡¼­ ¾Æ·¡·Î ¿ÞÂÊ¿¡¼­ ¿À¸¥ÂÊÀ¸·Î ÁøÇàÇϸ鼭 DCT°¡ °¢°¢ÀÇ ºí·Ï¿¡ Àû¿ëÇÏ°Ô µÈ´Ù. ¼Â°, °¢ ºí·ÏÀº ¾çÀÚÈ­¸¦ ÅëÇØ ¾ÐÃàÀ» ÁøÇàÇÑ´Ù. ³Ý°, À̹ÌÁö¸¦ ±¸¼ºÇÏ´Â ¾ÐÃàµÈ ºí·ÏÀÇ Çà·ÄÀº Å©°Ô ÁÙ¾îµç °ø°£¿¡ ÀúÀåµÈ´Ù. ³¡À¸·Î, ¿øÇÏ´Â °æ¿ì À̹ÌÁö´Â ¿ªÀÌ»êÄÚ»çÀκ¯È¯(IDCT)À» »ç¿ëÇÏ´Â ÇÁ·Î¼¼½ºÀÎ ¾ÐÃà ÇØÁ¦¸¦ ÅëÇØ À籸¼ºÇÏ°Ô µÈ´Ù. º» ¿¬±¸¿¡¼­´Â ÀÌ»êÄÚ»çÀκ¯È¯ ±â¹ýÀ» ÀÌ¿ëÇØ À̹ÌÁö ¾ÐÃà/º¹¿ø ¹× À籸¼ºÇÏ´Â °Í¿¡ ¸ñÀûÀ» µÎ°í ÀÖ´Ù.
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(English Abstract)
JPEG is a most widely used standard image compression technology. This research introduces the JPEG image compression algorithm and describes each step in the compression and decompression. Image compression is the application of data compression on digital images. The DCT (discrete cosine transform) is a technique for converting a time domain to a frequency domain. First, the image is divided into 8 by 8 pixel blocks. Second, working from top to bottom left to right, the DCT is applied to each block. Third, each block is compressed through quantization. Fourth, the matrix of compressed blocks that make up the image is stored in a greatly reduced amount of space. Finally if desired, the image is reconstructed through decompression, a process using IDCT (inverse discrete cosine transform). The purpose of this research is to review all the processes of image compression / decompression using the discrete cosine transform method.
Å°¿öµå(Keyword) µ¥ÀÌÅÍ ¾ÐÃà   ¾ÐÃà ¾Ë°í¸®Áò   ¾çÀÚÈ­   À̹ÌÁö   ÀÌ»êÄÚ»çÀκ¯È¯   Data compression   Compression algorithm   Quantization   Image   Discrete cosine transform  
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