Android图像处理系统1.4图像的锐化-边缘检测
16lz
2021-01-23
Android图像处理系统1.4图像的锐化-边缘检测
图像的锐化-边缘检测：(Robert Gradient、Sobel Gradient、Laplace Gradient)
@author：郑海波
相关博客：
1.http://blog.csdn.net/nuptboyzhb/article/details/7925994
2.http://blog.csdn.net/nuptboyzhb/article/details/7926407
1.Robert Gradient
[图1]
2.Sobel Gradient
[图2]
3.Laplace Gradient
[图3]
关键的Java代码
/* * Robert算子梯度 * */public Bitmap RobertGradient(Bitmap myBitmap){// Create new array int width = myBitmap.getWidth(); int height = myBitmap.getHeight(); int[] pix = new int[width * height]; myBitmap.getPixels(pix, 0, width, 0, 0, width, height); Matrix dataR=getDataR(pix, width, height); Matrix dataG=getDataG(pix, width, height); Matrix dataB=getDataB(pix, width, height); //Matrix dataGray=getDataGray(pix, width, height); ///////////////////////////////////////////////////////// dataR=eachRobertGradient(dataR,width,height); dataG=eachRobertGradient(dataG,width,height); dataB=eachRobertGradient(dataB,width,height); /////////////////////////////////////////////////////////////// // Change bitmap to use new array Bitmap bitmap=makeToBitmap(dataR, dataG, dataB, width, height); myBitmap = null; pix = null; return bitmap;}private Matrix eachRobertGradient(Matrix tempM,int width,int height){int i,j;for(i=0;i<width-1;i++){for(j=0;j<height-1;j++){int temp=Math.abs((int)tempM.get(i, j)-(int)tempM.get(i,j+1)) +Math.abs((int)tempM.get(i+1,j)-(int)tempM.get(i,j+1));tempM.set(i, j, temp);}}return tempM;}/* *Sobel算子锐化 */public Bitmap SobelGradient(Bitmap myBitmap){// Create new array int width = myBitmap.getWidth(); int height = myBitmap.getHeight(); int[] pix = new int[width * height]; myBitmap.getPixels(pix, 0, width, 0, 0, width, height); Matrix dataR=getDataR(pix, width, height); Matrix dataG=getDataG(pix, width, height); Matrix dataB=getDataB(pix, width, height); Matrix dataGray=getDataGray(pix, width, height); ///////////////////////////////////////////////////////// dataGray=eachSobelGradient(dataGray, width, height); dataR=dataGray.copy(); dataG=dataGray.copy(); dataB=dataGray.copy(); /////////////////////////////////////////////////////////////// // Change bitmap to use new array Bitmap bitmap=makeToBitmap(dataR, dataG, dataB, width, height); myBitmap = null; pix = null; return bitmap;}private Matrix eachSobelGradient(Matrix tempM,int width,int height){int i,j;Matrix resultMatrix=tempM.copy();for(i=1;i<width-1;i++){for(j=1;j<height-1;j++){int temp1=Math.abs(((int)tempM.get(i+1, j-1)+2*(int)tempM.get(i+1, j)+(int)tempM.get(i+1,j+1)) -(((int)tempM.get(i-1,j-1)+2*(int)tempM.get(i-1,j)+(int)tempM.get(i-1,j-1))));int temp2=Math.abs(((int)tempM.get(i-1, j+1)+2*(int)tempM.get(i, j+1)+(int)tempM.get(i+1,j+1)) -(((int)tempM.get(i-1,j-1)+2*(int)tempM.get(i,j-1)+(int)tempM.get(i+1,j-1))));int temp=temp1+temp2;resultMatrix.set(i, j, temp);}}return resultMatrix;}/* *Laplace 锐化 */public Bitmap LaplaceGradient(Bitmap myBitmap){// Create new array int width = myBitmap.getWidth(); int height = myBitmap.getHeight(); int[] pix = new int[width * height]; myBitmap.getPixels(pix, 0, width, 0, 0, width, height); Matrix dataR=getDataR(pix, width, height); Matrix dataG=getDataG(pix, width, height); Matrix dataB=getDataB(pix, width, height); Matrix dataGray=getDataGray(pix, width, height); ///////////////////////////////////////////////////////// dataGray=eachLaplaceGradient(dataGray,width,height); dataR=dataGray.copy(); dataG=dataGray.copy(); dataB=dataGray.copy(); /////////////////////////////////////////////////////////////// // Change bitmap to use new array Bitmap bitmap=makeToBitmap(dataR, dataG, dataB, width, height); myBitmap = null; pix = null; return bitmap;}private Matrix eachLaplaceGradient(Matrix tempM,int width,int height){int i,j;Matrix resultMatrix=tempM.copy();for(i=1;i<width-1;i++){for(j=1;j<height-1;j++){int temp=Math.abs(5*(int)tempM.get(i, j)-(int)tempM.get(i+1,j)-(int)tempM.get(i-1,j)-(int)tempM.get(i,j+1)-(int)tempM.get(i,j-1));resultMatrix.set(i, j, temp);}}return resultMatrix;}
更多相关文章
- Android 4.4 在启动到 ANDROID 闪光字的时候图像错乱的解决过程
- Android中的图形图像
- Android图像滤镜框架GPUImage从配置到应用
- 第1章 Android图像概述
- Android图像处理_浮雕效果