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 {
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	   "source": [
       "# Chapter 5: Image Enhancement"
	   ]
	},
{
		   "cell_type": "markdown",
		   "metadata": {},
		   "source": [
			"## Example 5.13: Scilab_code_to_determine_image_negative.sce"
		   ]
		  },
  {
"cell_type": "code",
	   "execution_count": null,
	   "metadata": {
	    "collapsed": true
	   },
	   "outputs": [],
"source": [
"//Caption:Scilab code to determine image negative\n",
"//Fig.5.13\n",
"//page 252\n",
"clc;\n",
"close;\n",
"a = imread('E:\DIP_JAYARAMAN\Chapter5\label.jpg');\n",
"k = 255-double(a);\n",
"k = uint8(k);\n",
"imshow(a); \n",
"title('Original onca Image')\n",
"imshow(k); \n",
"title('Negative of Original Image')"
   ]
   }
,
{
		   "cell_type": "markdown",
		   "metadata": {},
		   "source": [
			"## Example 5.16: Scilab_code_that_performs_threshold_operatio.sce"
		   ]
		  },
  {
"cell_type": "code",
	   "execution_count": null,
	   "metadata": {
	    "collapsed": true
	   },
	   "outputs": [],
"source": [
"//Caption:Scilab code that performs threshold operation\n",
"//Fig5.16\n",
"//page 254\n",
"clc;\n",
"close;\n",
"a = imread('E:\Digital_Image_Processing_Jayaraman\Chapter5\lena.png');\n",
"a = rgb2gray(a);\n",
"[m n] = size(a);\n",
"t = input('Enter the threshold parameter');\n",
"for i = 1:m\n",
"    for j = 1:n\n",
"        if(a(i,j)<t)\n",
"            b(i,j)=0;\n",
"        else\n",
"            b(i,j)=255;\n",
"        end\n",
"    end\n",
"end\n",
"figure(1)\n",
"ShowImage(a,'Original Image'); \n",
"title('Original Image')\n",
"figure(2)\n",
"ShowImage(b,'Thresholded Image'); \n",
"title('Thresholded Image')\n",
"xlabel(sprintf('Threshold value is %g',t))\n",
"//Result\n",
"//Enter the threshold parameter 140"
   ]
   }
,
{
		   "cell_type": "markdown",
		   "metadata": {},
		   "source": [
			"## Example 5.20: Program_performs_gray_level_slicing_without_background.sce"
		   ]
		  },
  {
"cell_type": "code",
	   "execution_count": null,
	   "metadata": {
	    "collapsed": true
	   },
	   "outputs": [],
"source": [
"//Caption: Program performs gray level slicing without background\n",
"//Fig.5.20\n",
"//page256\n",
"clc;\n",
"x = imread('E:\Digital_Image_Processing_Jayaraman\Chapter5\lena.png');\n",
"x = rgb2gray(x);\n",
"y = double(x);\n",
"[m,n]= size(y);\n",
"L = max(max(x));\n",
"a = round(L/2);\n",
"b = L;\n",
"for i =1:m\n",
"    for j =1:n\n",
"        if(y(i,j)>=a & y(i,j)<=b)\n",
"            z(i,j) = L;\n",
"        else\n",
"            z(i,j)=0;\n",
"        end\n",
"    end\n",
"end\n",
"z = uint8(z);\n",
"figure(1)\n",
"ShowImage(x,'Original Image');\n",
"title('Orginal Image')\n",
"figure(2)\n",
"ShowImage(z,'Gray Level Slicing');\n",
"title('Gray Level Slicing without preserving background')"
   ]
   }
,
{
		   "cell_type": "markdown",
		   "metadata": {},
		   "source": [
			"## Example 5.5: Scilab_code_for_brightness_enhancement.sce"
		   ]
		  },
  {
"cell_type": "code",
	   "execution_count": null,
	   "metadata": {
	    "collapsed": true
	   },
	   "outputs": [],
"source": [
"//Caption:Scilab code for brightness enhancement \n",
"//Fig5.5\n",
"//page 246\n",
"clc;\n",
"close;\n",
"//a = imread('E:\DIP_JAYARAMAN\Chapter5\plate.GIF');  //SIVP toolbox\n",
"a = imread('E:\DIP_JAYARAMAN\Chapter4\baboon.png');\n",
"a = rgb2gray(a);\n",
"b = double(a)+50;\n",
"b = uint8(b);\n",
"figure(1)\n",
"ShowImage(a,'Original Image'); \n",
"title('Original Image')\n",
"figure(2)\n",
"ShowImage(b,'Enhanced Image'); \n",
"title('Enhanced Image')"
   ]
   }
,
{
		   "cell_type": "markdown",
		   "metadata": {},
		   "source": [
			"## Example 5.7: Scilab_code_for_brightness_suppression.sce"
		   ]
		  },
  {
"cell_type": "code",
	   "execution_count": null,
	   "metadata": {
	    "collapsed": true
	   },
	   "outputs": [],
"source": [
"//Caption:Scilab code for  brightness suppression\n",
"//Fig5.7\n",
"//page 247\n",
"clc;\n",
"close;\n",
"a = imread('E:\DIP_JAYARAMAN\Chapter4\baboon.png');\n",
"a = rgb2gray(a);\n",
"b = double(a)-50;\n",
"b = uint8(b);\n",
"figure(1)\n",
"ShowImage(a,'Original Image'); \n",
"title('Original Image')\n",
"figure(2)\n",
"ShowImage(b,'Brightness Supressed Image'); \n",
"title('Brightness Supressed Image')"
   ]
   }
,
{
		   "cell_type": "markdown",
		   "metadata": {},
		   "source": [
			"## Example 5.9: Scilab_code_for_Contrast_Manipulation.sce"
		   ]
		  },
  {
"cell_type": "code",
	   "execution_count": null,
	   "metadata": {
	    "collapsed": true
	   },
	   "outputs": [],
"source": [
"//Caption:Scilab code for  Contrast Manipulation\n",
"//Fig5.9\n",
"//page 248\n",
"clc;\n",
"close;\n",
"a = imread('E:\DIP_JAYARAMAN\Chapter4\lena.png');\n",
"a = rgb2gray(a);\n",
"b = double(a)*0.5;\n",
"b = uint8(b)\n",
"c = double(b)*2;\n",
"c = uint8(c)\n",
"figure(1)\n",
"ShowImage(a,'Original Image'); \n",
"title('Original Image')\n",
"figure(2)\n",
"ShowImage(b,'Decrease in Contrast'); \n",
"title('Decrease in Contrast')\n",
"figure(3)\n",
"ShowImage(c,'Increase in Contrast'); \n",
"title('Increase in Contrast')"
   ]
   }
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