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JPEG ENCODER

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1.subsampling
2.level shifting --> dct -->quantization
3.DPCM OF DC COEFFICIENTS+HUFFMAN ENCODING.
4.ZIGZAG SCAN OF AC COEFFICIENTS
5.RUNLENGTH ENCODING + HUFFMAN ENCODING OF AC COEFFICIENTS.
6.ARRANGING THE AC DC COEFFICIENTS OF LUMA ,CB , CR ACCORDING TO JPEG STANDARD. (420 SUBSAMPLING) , REFER TO FIG 'itut81.JPG'.
7.COMBINING (LUMA,CB,CR) BITSREAMS OF 3 COMPONENTS.
7.BYTE STUFFING
8.TAKING 1 BYTE(8 BITS OF CODED STREAM) AND CONVERTING INTO DECIMAL EQUIVALENT.
9.WRITING JFIF HEADER FORMAT .
10. WRITING THE ENCODED BITSTREAM INTO THE ENTROPY CODED SEGMENT OF JFIF HEADER.

11.DECODING PART IS DONE BY THE IMAGE VIEWER ( DEFAULT IMAGE VIEWER LIKE MICROSOFT PICTURE , FAX VIEWER,PICASA, OR ANY OTHER VIWEWRS)

NOTE : I HAVE REPEATED THE DC ENTROPY AND AC ENTROPY CODING PROCEDURE , SEPERATELY FOR EACH COMPONENTS (LUMA,CB,CR). IT CAN BE AVOIDED BY WRITING A SINGLE FUNCTION EACH FOR AC AND DC ENTROPY ENCODING.

functions 'table_huff 'is same as 'table_bitcodval' .

THANKS

Free download from Shareware Connection - level shifting --> dct -->quantization

Publisher: NIKHIL S KUMAR | License: Shareware
Version: 1.0 | Size: 41 KB | Platform: Matlab, Scripts
Released Date: 24-06-2013 | Rating: 0 | Title: JPEG ENCODER

Author Url: http://www.mathworks.com
Program Info Url: http://www.mathworks.com
Download Url: http://www.mathworks.com/matlabcentral/fx_files/24608/2/jpeg_encoder_complete.zip

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