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Android 实现图像的灰度化和二值化
/*******************************灰度化**************************/
Button buttonGray = (Button) findViewById(R.id.buttonGray);
buttonGray.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
//bmp=(Bitmap) data.getExtras().get("data");
bmp=BitmapFactory.decodeFile(picturePath);
//bmp=BitmapFactory.decodeStream(getContentResolver().openInputStream(selectedImage),null,bmpFactoryOptions);
imageCreate = (ImageView) findViewById(R.id.imgView1);
createBmp=Bitmap.createBitmap(bmp.getWidth(), bmp.getHeight(), bmp.getConfig());
canvas = new Canvas(createBmp); //画布 传入位图用于绘制
paint = new Paint(); //画刷 改变颜色 对比度等属性
canvas.drawBitmap(bmp, 0, 0, paint); //错误:没有图片 因为参数bmp写成createBmp
//imageCreate.setImageBitmap(createBmp);
imageCreate.setImageBitmap(grayScaleImage(BitmapFactory.decodeFile(picturePath)));
imageCreate.setVisibility(View.VISIBLE);
//imageView1.setImageBitmap(grayScaleImage(BitmapFactory.decodeFile(picturePath)));
}
});
/*******************************二值化**************************/
Button buttonBinar = (Button) findViewById(R.id.buttonBinar);
buttonBinar.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
bmp=BitmapFactory.decodeFile(picturePath);
imageCreate = (ImageView) findViewById(R.id.imgView1);
createBmp=Bitmap.createBitmap(bmp.getWidth(), bmp.getHeight(), bmp.getConfig());
canvas = new Canvas(createBmp); //画布 传入位图用于绘制
paint = new Paint(); //画刷 改变颜色 对比度等属性
canvas.drawBitmap(bmp, 0, 0, paint); //错误:没有图片 因为参数bmp写成createBmp
imageCreate.setImageBitmap(binaryzationImage(BitmapFactory.decodeFile(picturePath)));
imageCreate.setVisibility(View.VISIBLE);
}
});
}
}
public static Bitmap grayScaleImage(Bitmap src) {
// constant factors
final double GS_RED = 0.299;
final double GS_GREEN = 0.587;
final double GS_BLUE = 0.114;
// create output bitmap
Bitmap bmOut = Bitmap.createBitmap(src.getWidth(), src.getHeight(), src.getConfig());
// pixel information
int A, R, G, B;
int pixel;
// get image size
int width = src.getWidth();
int height = src.getHeight();
// scan through every single pixel
for(int x = 0; x < width; x) {
for(int y = 0; y < height; y) {
// get one pixel color
pixel = src.getPixel(x, y);
// retrieve color of all channels
A = Color.alpha(pixel);
R = Color.red(pixel);
G = Color.green(pixel);
B = Color.blue(pixel);
// take conversion up to one single value
R = G = B = (int)(GS_RED * R GS_GREEN * G GS_BLUE * B);
// set new pixel color to output bitmap
bmOut.setPixel(x, y, Color.argb(A, R, G, B));
}
}
// return final image
return bmOut;
}
public static Bitmap binaryzationImage(Bitmap src) {
final double GS_RED = 0.299;
final double GS_GREEN = 0.587;
final double GS_BLUE = 0.114;
// create output bitmap
Bitmap bmOut1 = Bitmap.createBitmap(src.getWidth(), src.getHeight(), src.getConfig());
// pixel information
int A, R, G, B;
int pixel;
// get image size
int width = src.getWidth();
int height = src.getHeight();
// scan through every single pixel
for(int x = 0; x < width; x) {
for(int y = 0; y < height; y) {
// get one pixel color
pixel = src.getPixel(x, y);
// retrieve color of all channels
A = Color.alpha(pixel);
R = Color.red(pixel);
G = Color.green(pixel);
B = Color.blue(pixel);
R = G = B = (int)(GS_RED * R GS_GREEN * G GS_BLUE * B);
if( R<100)
R=0;
else
R=255;
if( G<100)
G=0;
else
G=255;
if( B<100)
B=0;
else
B=255;
// set new pixel color to output bitmap
bmOut1.setPixel(x, y, Color.argb(A, R, G, B));
}
}
// return final image
return bmOut1;
}