Android 影象灰度化、線性灰度變化、二值化處理方法
摘要：
android
1、影象灰度化：
public Bitmap bitmap2Gray(Bitmap bmSrc) {
// 得到圖片的長和寬
int width = bmSrc.getWidth();
int ...
android
1、影象灰度化：
public Bitmap bitmap2Gray(Bitmap bmSrc) { // 得到圖片的長和寬 int width = bmSrc.getWidth(); int height = bmSrc.getHeight(); // 建立目標灰度影象 Bitmap bmpGray = null; bmpGray = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565); // 建立畫布 Canvas c = new Canvas(bmpGray); Paint paint = new Paint(); ColorMatrix cm = new ColorMatrix(); cm.setSaturation(0); ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm); paint.setColorFilter(f); c.drawBitmap(bmSrc, 0, 0, paint); return bmpGray; }
2、對影象進行線性灰度變化
public Bitmap lineGrey(Bitmap image) {
//得到影象的寬度和長度
int width = image.getWidth();
int height = image.getHeight();
//建立線性拉昇灰度影象
Bitmap linegray = null;
linegray = image.copy(Config.ARGB_8888, true);
//依次迴圈對影象的畫素進行處理
for (int i = 0; i < width; i++) {
for (int j = 0; j < height; j++) {
//得到每點的畫素值
int col = image.getPixel(i, j);
int alpha = col & 0xFF000000;
int red = (col & 0x00FF0000) >> 16;
int green = (col & 0x0000FF00) >> 8;
int blue = (col & 0x000000FF);
// 增加了影象的亮度
red = (int) (1.1 * red + 30);
green = (int) (1.1 * green + 30);
blue = (int) (1.1 * blue + 30);
//對影象畫素越界進行處理
if (red >= 255)
{
red = 255;
}
if (green >= 255) {
green = 255;
}
if (blue >= 255) {
blue = 255;
}
// 新的ARGB
int newColor = alpha | (red << 16) | (green << 8) | blue;
//設定新影象的RGB值
linegray.setPixel(i, j, newColor);
}
}
return linegray;
}
3、對影象進行二值化
public Bitmap gray2Binary(Bitmap graymap) {
//得到圖形的寬度和長度
int width = graymap.getWidth();
int height = graymap.getHeight();
//建立二值化影象
Bitmap binarymap = null;
binarymap = graymap.copy(Config.ARGB_8888, true);
//依次迴圈，對影象的畫素進行處理
for (int i = 0; i < width; i++) {
for (int j = 0; j < height; j++) {
//得到當前畫素的值
int col = binarymap.getPixel(i, j);
//得到alpha通道的值
int alpha = col & 0xFF000000;
//得到影象的畫素RGB的值
int red = (col & 0x00FF0000) >> 16;
int green = (col & 0x0000FF00) >> 8;
int blue = (col & 0x000000FF);
// 用公式X = 0.3×R+0.59×G+0.11×B計算出X代替原來的RGB
int gray = (int) ((float) red * 0.3 + (float) green * 0.59 + (float) blue * 0.11);
//對影象進行二值化處理
if (gray <= 95) {
gray = 0;
} else {
gray = 255;
}
// 新的ARGB
int newColor = alpha | (gray << 16) | (gray << 8) | gray;
//設定新影象的當前畫素值
binarymap.setPixel(i, j, newColor);
}
}
return binarymap;
}