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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Chapter 9: Image Compression"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 9.59: Program_performs_Block_Truncation_Coding.sce"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"//Caption: Program performs Block Truncation Coding(BTC) by choosing different \n",
"//block sizes\n",
"//Fig.9.59: MATLAB Example1\n",
"//page514\n",
"close;\n",
"clc;\n",
"x =imread('E:\Digital_Image_Processing_Jayaraman\Chapter9\lenna.jpg'); //SIVP toolbox\n",
"//x=imresize(x,[256 256]);\n",
"x1=x;\n",
"x=double(x);\n",
"[m1 n1]=size(x);\n",
"blk=input('Enter the block size:');\n",
"for i = 1 : blk : m1 \n",
"for j = 1 : blk : n1 \n",
" y = x(i:i+(blk-1),j:j+(blk-1)) ; \n",
" m = mean(mean(y)); \n",
" sig=std2(y);\n",
" b = y > m ; //the binary block \n",
" K = sum(sum(b)); \n",
" if (K ~= blk^2 ) & ( K ~= 0) \n",
" ml = m-sig*sqrt(K/((blk^2)-K)); \n",
" mu = m+sig*sqrt(((blk^2)-K)/K); \n",
" x(i:i+(blk-1), j:j+(blk-1)) = b*mu+(1- b)*ml; \n",
" end \n",
"end \n",
"end \n",
"//imshow(uint8(x))\n",
"//title('Reconstructed Image')\n",
"x = uint8(x);\n",
"figure(1)\n",
"imshow(x1)\n",
"title('Original Image'); //IPD toolbox\n",
"figure(2)\n",
"ShowImage(x, 'Reconstructed Image'); //IPD toolbox\n",
"title('Block Size = 8')"
]
}
,
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 9.9: Program_performs_Block_Truncation_Coding_BTC.sce"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"//Caption: Program performs Block Truncation Coding(BTC) \n",
"//Example 9.9\n",
"//page512\n",
"close;\n",
"clear;\n",
"clc;\n",
"x = [65,75,80,70;72,75,82,68;84,72,62,65;66,68,72,80];\n",
"disp(x,'Original Block is x =')\n",
"[m1 n1]=size(x);\n",
"blk=input('Enter the block size:');\n",
"for i = 1 : blk : m1 \n",
"for j = 1 : blk : n1 \n",
" y = x(i:i+(blk-1),j:j+(blk-1)) ; \n",
" m = mean(mean(y)); \n",
" disp(m,'mean value is m =')\n",
" sig=std2(y);\n",
" disp(sig,'Standard deviation of the block is =')\n",
" b = y > m ; //the binary block \n",
" disp(b,'Binary allocation matrix is B=')\n",
" K = sum(sum(b)); \n",
" disp(K,'number of ones =')\n",
" if (K ~= blk^2 ) & ( K ~= 0) \n",
" ml = m-sig*sqrt(K/((blk^2)-K)); \n",
" disp(ml,'The value of a =')\n",
" mu = m+sig*sqrt(((blk^2)-K)/K); \n",
" disp(mu,'The value of b =')\n",
" x(i:i+(blk-1), j:j+(blk-1)) = b*mu+(1- b)*ml; \n",
" end \n",
"end \n",
"end \n",
"disp(round(x),'Reconstructed Block is x =')\n",
"//Result\n",
"//Original Block is x = \n",
"// \n",
"// 65. 75. 80. 70. \n",
"// 72. 75. 82. 68. \n",
"// 84. 72. 62. 65. \n",
"// 66. 68. 72. 80. \n",
"// \n",
"//Enter the block size:4\n",
"//mean value is m = 72.25 \n",
"//Standard deviation of the block is = 6.6282225 \n",
"//Binary allocation matrix is B= \n",
"// \n",
"// F T T F \n",
"// F T T F \n",
"// T F F F \n",
"// F F F T \n",
"// \n",
"//number of ones = 6\n",
"//The value of a = 67.115801 \n",
"//The value of b = 80.806998 \n",
"//Reconstructed Block is x = \n",
"// \n",
"// 67. 81. 81. 67. \n",
"// 67. 81. 81. 67. \n",
"// 81. 67. 67. 67. \n",
"// 67. 67. 67. 81. "
]
}
],
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{
"text": "MetaKernel Magics",
"url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
}
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