搜索
实验9综合练习(一)实验目的：1.对需要进行处理的图像分析，正确运用所学的知识，采用正确的步骤，对图像进行各类处理，以得到令人满意的图像效果。实验内容：1.将bone_scan.jpg图像文件读入Matlab，按照以下步骤对其进行处理：a)用带对角线的Laplacian对其处理，以增强边缘。W1=[-1-1-1-18-1-1-1-1]b)用imadd函数叠加原始图像，可以看出边界增强了，但噪声增强了，应想法降低。c)对原图像进行Sobel滤波。(用fspecial生成)d)并用imfilter对(c)的结果进行5×5邻域平均，以减少噪声。e)用immultiply函数处理经（b）步骤和（d）步骤处理后的图像，噪声得以减少。f)最后用imadjust函数做幂次灰度变换，以增强dynamicrange。（多试几次，参考：γ取0.5）要求用imshow函数显示经每一步处理后的图像，比对效果。参考程序与处理结果======================================================================%Enhancingaimageofwholebodybonescanbycombiningvariousspatial%enhancementmethods,thestrategiesisasfollowing:%========================================================%1.UtilizetheLaplaciantohighlightfinedetail%2.Utilizethegradienttoenhanceprominentedges%3.CombineLaplacianandgradienttogetthedetail-enhancedandnoise-compressedimage%4.Increasethecontrastoflowgraylevelsbyusingagray-leveltransformation.%==========================================================%Theoriginalimagenamed'Fig0306(a)(bone-scan).tif'isunderthe%directory:J:\courseteaching\ҽѧͼÏñ´¦Àí\ʵÑé\ʾÀýͼÏñ%CopyrightbyHuangzhongchao,July16,2006clearall;closeall;f=imread('J:\courseteaching\ҽѧͼÏñ´¦Àí\ʵÑé\ʾÀýͼÏñ\Fig0306(a)(bone-scan).tif');f1=im2double(f);h1=fspecial('sobel');%ordirectlytypeh=[-1-2-1;000;121];g1=imfilter(f1,h1);subplot(121);imshow(f);title('theoriginalimage');%b1=mat2gray(g1);subplot(122);imshow(g1);title('theSobelgradient');h2=fspecial('average',5);%procducingaaverageingfilterg2=imfilter(g1,h2);figure(2);subplot(121);imshow(g2);title('thesmoothedgradientimage');h3=[-1-1-1;-18-1;-1-1-1];%Laplacianmaskg3=imfilter(f1,h3);%b2=mat2gray(g3);subplot(122);imshow(g3);title('theLaplacianimage');g4=g3+f1;figure(3);subplot(121);imshow(g4)title('sharpedimagebyaddinglaplacianfilteredandoriginalimage');g5=g4.*g2;subplot(122);imshow(g5);title('theproductofsmoothedgradientandLaplacianimage');g6=g5+f1;figure(4);subplot(121);imshow(g6);title('thesumofproductandoriginalimage');%constrastspreadingbypower-lawtransformationwithr=0.5andc=1;gamma=0.5;c=1;g7=c.*g6.^gamma;figure(4);subplot(122);imshow(g7);title('theendresultbycombiningthesharpingandgradientoperation');======================================================================运行结果参考：