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diff --git a/codec/readme.txt b/codec/readme.txt deleted file mode 100644 index 972fac4e..00000000 --- a/codec/readme.txt +++ /dev/null @@ -1,105 +0,0 @@ -List of parameters for the coder JPEG 2000 : - -Date : June the 25th, 2003 -Author : Yannick Verschueren -Contact : verschueren@tele.ucl.ac.be - -- the option -help displays the readme.txt file on screen - -- The markers COD and QCD are writed both of two in the main_header and never appear in the tile_header. The markers in the main header are : SOC SIZ COD QCD COM. - -- This coder can encode mega image, a test was made on a 24000x24000 pixels color image. You need enough disk space memory (twice the original) to encode the image. (i.e. for a 1.5 Gb image you need a minimum of 3Gb of disk memory) - -REMARKS : ---------- - -* the value of rate enter in the code line is the compression factor ! -exemple : - --r 20,10,1 means quality 1 : compress 20x, quality 2 : compress 10x and quality 3 : compress 1x = lossless - -* The number of resolution can be modified by the program in view to respect profile-0 conditions (Taubman, Marcelin (2002), "JPEG2000, image compression fundamentals, standards and practice", p700) - -By default : ------------- - - * lossless - * 1 tile - * size of precinct 2^15 x 2^15 (means 1 precinct) - * size of code-block 64 x 64 - * Number of resolution : 6 - * No SOP marker in the codestream - * No EPH marker in the codestream - * No sub-sampling in x and y direction - * No mode switch activated - * progression order : LRCP - * No index file - * No ROI upshifted - * No offset of the origin of the image - * No offset of the origin of the tiles - * Reversible DWT 5-3 - -Parameters : ------------- - --i : source file (-i source.pnm also *.pgm, *.ppm) "required" - --o : destination file (-o dest.j2k) "required" - --r : different rates (-r 20,10,5) "optional" - --n : Number of resolution (-n 3) "optional" - --b : size of code block (-b 32,32) "optional" - --c : size of precinct (-c 128,128) "optional" - --t : size of tile (-t 512,512) "optional" - --p : progression order (-p LRCP) [LRCP, RLCP, RPCL, PCRL, CPRL] "optional" - --s : subsampling factor (-s 2,2) [-s X,Y] "optional" - --SOP : write SOP marker before each packet "optional" - --EPH : write EPH marker after each header packet "optional" - --M : mode switch (-M 3) [1= BYPASS(LAZY) 2=RESET 4=RESTART(TERMALL) 8=VSC 16=ERTERM(SEGTERM) 32=SEGMARK(SEGSYM)] "optional" - for several mode switch you have to add the value of each mode you want - ex : RESTART(4) + RESET(2) + SEGMARK(32) = -M 38 - --x : Create an index file *.Idx (-x index_name.Idx) "optional" - --ROI:c=%d,U=%d : quantization indices upshifted for component c=%d [%d = 0,1,2] - with a value of U=%d [0 <= %d <= 37] (i.e. -ROI:c=0,U=25) "optional" - --d : offset of the origin of the image (-d 150,300) "optional" - --T : offset of the origin of the tiles (-T 100,75) "optional" - --I : Use the irreversible DWT 9-7 (-I) "optional" - -IMPORTANT : ------------ - -* subsampling bigger than 2 can produce error - -The index file respect the structure below : ---------------------------------------------- - -Image_height Image_width -progression order -Tiles_size_X Tiles_size_Y -Components_nb -Layers_nb -decomposition_levels -Precincts_size_X Precincts_size_Y -Main_header_end_position -Codestream_size -Tile0 start_pos end_Theader end_pos -Tile1 " " " -... -TileN " " " -Tpacket_0 Tile layer res. comp. prec. start_pos end_pos -... -Tpacket_M " " " " " " " |
