我正在尝试将灰度图像转换为二进制图像。我将代码转换为灰度的代码，但我不知道如何将该图像转换为二进制。这是我目前的代码。请帮我！！！谢谢！
package com.example.vanderbilt;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;
import android.os.Bundle;
import android.widget.ImageView;
import org.opencv.android.Utils;
import org.opencv.core.Mat;
import org.opencv.imgproc.Imgproc;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
public class Binary扩展了Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.binary);
ImageView img = (ImageView) findViewById(R.id.ivBinary);
/*
* Bitmap bmp = BitmapFactory.decodeResource(getResources(),
* R.drawable.sample4); Bitmap bmpGray = toGrayscale(bmp);
* img.setImageBitmap(bmpGray);
*/
Bitmap bmp = BitmapFactory.decodeResource(getResources(),
R.drawable.sample4);
Mat imgToProcess = Utils.bitmapToMat(bmp);
for (int i = 0; i < imgToProcess.height(); i++) {
for (int j = 0; j < imgToProcess.width(); j++) {
double y = 0.3 * imgToProcess.get(i, j)[0] + 0.59
* imgToProcess.get(i, j)[1] + 0.11
* imgToProcess.get(i, j)[2];
imgToProcess.put(i, j, new double[] { y, y, y, 255 });
}
}
int widthM, heightM, rowsM, colsM;
colsM = imgToProcess.cols();
rowsM = imgToProcess.rows();
heightM = imgToProcess.height();
widthM = imgToProcess.width();
Bitmap bmpOut = Bitmap.createBitmap(imgToProcess.cols(),
imgToProcess.rows(), Bitmap.Config.ARGB_8888);
Utils.matToBitmap(imgToProcess, bmpOut);
img.setImageBitmap(bmpOut);
}
public Bitmap toGrayscale(Bitmap bmpOriginal) {
int width, height;
height = bmpOriginal.getHeight();
width = bmpOriginal.getWidth();
Bitmap bmpGrayscale = Bitmap.createBitmap(width, height,
Bitmap.Config.RGB_565);
Canvas c = new Canvas(bmpGrayscale);
Paint paint = new Paint();
ColorMatrix cm = new ColorMatrix();
cm.setSaturation(0);
ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
paint.setColorFilter(f);
c.drawBitmap(bmpOriginal, 0, 0, paint);
return bmpGrayscale;
}
}
答案 0 :(得分：3)
我以前用android完成了一些图像过滤，对于ThresholdingFilter，我使用了这段代码：
public class ThresholdingFilter {
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ METHODS ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/**
* Methods that apply a Thresholding Effect on image
*
* @param imageIn the input image
* @param threshold Integer - value (0-255) prefered value (threshold = 125)
* @return
*/
public static AndroidImage process(AndroidImage imageIn, int threshold) {
// The Resulting image
AndroidImage imageOut;
// Initiate the Output image
imageOut = new AndroidImage(imageIn.getImage());
// Do Threshold process
for(int y=0; y<imageIn.getHeight(); y++){
for(int x=0; x<imageIn.getWidth(); x++){
if(imageOut.getRComponent(x,y) < threshold){
imageOut.setPixelColor(x, y, 0,0,0);
}
else{
imageOut.setPixelColor(x, y, 255,255,255);
}
}
}
// Return final image
return imageOut;
}
}
AndroidImage是Android Bitmap的自定义包装类
public class AndroidImage {
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ATTRIBUTES ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Original bitmap image
private Bitmap image;
// Format of the image (jpg/png)
private String formatName;
/** Dimensions of image */
// Width of the image
private int width;
// Height of the image
private int height;
// RGB Array Color
protected int[] colorArray;
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ METHODS ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/**
* Constructor
*
* @param img the Bitmap from which we create our AndroidImage Object
*/
public AndroidImage(Bitmap img){
this.image = img;
this.formatName = "jpg";
this.width = img.getWidth();
this.height = img.getHeight();
updateColorArray();
}
/**
* Method to reset the image to a solid color
*
* @param color - color to reset the entire image to
*/
public void clearImage(int color){
for(int y=0; y<height; y++){
for(int x=0; x<width; x++){
image.setPixel(x, y, color);
}
}
}
/**
* Method to set color array for image - called on initialization by constructor
*
*
*/
private void updateColorArray(){
colorArray = new int[width * height];
image.getPixels(colorArray, 0, width, 0, 0, width, height);
int r, g, b;
for (int y = 0; y < height; y++){
for (int x = 0; x < width; x++){
int index = y * width + x;
r = (colorArray[index] >> 16) & 0xff;
g = (colorArray[index] >> 8) & 0xff;
b = colorArray[index] & 0xff;
colorArray[index] = 0xff000000 | (r << 16) | (g << 8) | b;
}
}
}
/**
* Method to set the color of a specific pixel
*
* @param x
* @param y
* @param color
*/
public void setPixelColor(int x, int y, int color){
colorArray[((y*image.getWidth()+x))] = color;
image.setPixel(x, y, color);
}
/**
* Method to get the color of a specified pixel
*
* @param x
* @param y
* @return color
*/
public int getPixelColor(int x, int y){
return colorArray[y*width+x];
}
/**
* Method to set the color of a specified pixel from an RGB combination
*
* @param x
* @param y
* @param c0
* @param c1
* @param c2
*/
public void setPixelColor(int x, int y, int c0, int c1, int c2){
colorArray[((y*image.getWidth()+x))] = (255 << 24) + (c0 << 16) + (c1 << 8) + c2;
image.setPixel(x, y, colorArray[((y*image.getWidth()+x))]);
}
/**
* Method to get the RED color of a specified pixel
*
* @param x
* @param y
* @return color of R component
*/
public int getRComponent(int x, int y){
return (getColorArray()[((y*width+x))]& 0x00FF0000) >>> 16;
}
/**
* Method to get the GREEN color of a specified pixel
*
* @param x
* @param y
* @return color of G component
*/
public int getGComponent(int x, int y){
return (getColorArray()[((y*width+x))]& 0x0000FF00) >>> 8;
}
/**
* Method to get the BLUE color of a specified pixel
*
* @param x
* @param y
* @return color of B component
*/
public int getBComponent(int x, int y){
return (getColorArray()[((y*width+x))] & 0x000000FF);
}
/**
* Method to rotate an image by the specified number of degrees
*
* @param rotateDegrees
*/
public void rotate (int rotateDegrees){
Matrix mtx = new Matrix();
mtx.postRotate(rotateDegrees);
image = Bitmap.createBitmap(image, 0, 0, width, height, mtx, true);
width = image.getWidth();
height = image.getHeight();
updateColorArray();
}
// Setters and Getters
/**
* @return the image
*/
public Bitmap getImage() {
return image;
}
/**
* @param image the image to set
*/
public void setImage(Bitmap image) {
this.image = image;
}
/**
* @return the formatName
*/
public String getFormatName() {
return formatName;
}
/**
* @param formatName the formatName to set
*/
public void setFormatName(String formatName) {
this.formatName = formatName;
}
/**
* @return the width
*/
public int getWidth() {
return width;
}
/**
* @param width the width to set
*/
public void setWidth(int width) {
this.width = width;
}
/**
* @return the height
*/
public int getHeight() {
return height;
}
/**
* @param height the height to set
*/
public void setHeight(int height) {
this.height = height;
}
/**
* @return the colorArray
*/
public int[] getColorArray() {
return colorArray;
}
/**
* @param colorArray the colorArray to set
*/
public void setColorArray(int[] colorArray) {
this.colorArray = colorArray;
}
}
希望这会对你有所帮助