IDL 建立影像金字塔

形成按目录放好的，类似于Google Map Tile的金字塔瓦片Jpg。

   1:  ;

   2:  pro tsplit

   3:      ; 读入Jpeg格式文件

   4:      szFile = 'e:\test.jpg'; dialog_pickfile(title = 'input data')

   5:      read_jpeg,szFile,image,true = 3

   6:      ; 切割5级

   7:      nlevel = 5;

   8:      ;

   9:      for iLevel = 0,nLevel-1 do begin

  10:          split,image,ilevel,ib

  11:      endfor

  12:      return

  13:  end

  14:   

  15:  pro split,image,level,iband

  16:      src = 'e:\src'

  17:      ns0 = 512

  18:      nl0 = 512

  19:      n0 = 2^level

  20:      sz = size(image,/dimensions)

  21:      help,sz

  22:      print,sz

  23:      nx = sz[0]

  24:      ny = sz[1]

  25:      xspan = nx*1.0/n0;

  26:      yspan = ny*1.0/n0;

  27:      imglet = bytarr(ns0,nl0,3)

  28:   

  29:      fmt = '(%"%s\\%d\\img_%d_%d.jpg")';

  30:      for is = 0l,n0-1 do begin

  31:          for il = 0l,n0 -1 do begin

  32:              x = indgen(ns0)#replicate(1,nl0)*xspan/ns0 + is*xspan

  33:              y = replicate(1,ns0)#indgen(nl0)*yspan/nl0 + il*yspan

  34:              for ib = 0,2 do begin

  35:                  imglet[*,*,ib] = bilinear(image[*,*,ib],x,y)

  36:              endfor

  37:              fileout = string(src,level,n0-il-1,is,format =fmt)

  38:              dir = file_dirname(fileout)

  39:              if(file_test(dir,/directory) lt 1) then file_mkdir,dir

  40:              write_jpeg,fileout,imglet,true = 3

  41:          endfor

  42:      endfor

  43:  end

  44:   

  45:  ; 主程序

  46:  pro ttt

  47:   

  48:      tsplit

  49:      print,'Done

  50:  end

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