图像处理-像素点分析

public static Bitmap handleImageNegative(Bitmap bm) {
	int width = bm.getWidth();
	int height = bm.getHeight();
	int color;//存取当前像素点的颜色
	int R, G, B, A;//存取当前像素点的RGBA
	Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
	int[] oldPx = new int[width * height];
	int[] newPx = new int[width * height];
	bm.getPixels(oldPx, 0, width, 0, 0, width, height);//存储像素点的数组，起点需要偏移的量，读取数组的行距，第一次读取像素点的坐标(x,y)，读取的长度，读取的宽度
	for (int i = 0; i < width * height; i++) {
		color = oldPx[i];
		//分离出RGBA四个分量
		R = Color.red(color);
		G = Color.green(color);
		B = Color.blue(color);
		A = Color.alpha(color);
		R = 255 - R;
		G = 255 - G;
		B = 255 - B;
		if (R > 255) {
			R = 255;
		} else if (R < 0) {
			R = 0;
		}
		if (G > 255) {
			G = 255;
		} else if (G < 0) {
			G = 0;
		}
		if (B > 255) {
			B = 255;
		} else if (B < 0) {
			B = 0;
		}
		newPx[i] = Color.argb(A, R, G, B);
	}
	bmp.setPixels(newPx, 0, width, 0, 0, width, height);
	return bmp;
}

public static Bitmap handleImagePixelsOldPhoto(Bitmap bm) {
	Bitmap bmp = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(),
	Bitmap.Config.ARGB_8888);
	int width = bm.getWidth();
	int height = bm.getHeight();
	int color = 0;
	int r, g, b, a, r1, g1, b1;

	int[] oldPx = new int[width * height];
	int[] newPx = new int[width * height];

	bm.getPixels(oldPx, 0, bm.getWidth(), 0, 0, width, height);
	for (int i = 0; i < width * height; i++) {
		color = oldPx[i];
		a = Color.alpha(color);
		r = Color.red(color);
		g = Color.green(color);
		b = Color.blue(color);

		r1 = (int) (0.393 * r + 0.769 * g + 0.189 * b);
		g1 = (int) (0.349 * r + 0.686 * g + 0.168 * b);
		b1 = (int) (0.272 * r + 0.534 * g + 0.131 * b);

		if (r1 > 255) {
			r1 = 255;
		}
		if (g1 > 255) {
			g1 = 255;
		}
		if (b1 > 255) {
			b1 = 255;
		}

		newPx[i] = Color.argb(a, r1, g1, b1);
	}
	bmp.setPixels(newPx, 0, width, 0, 0, width, height);
	return bmp;
}

public static Bitmap handleImagePixelsRelief(Bitmap bm) {
	Bitmap bmp = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(),
	Bitmap.Config.ARGB_8888);
	int width = bm.getWidth();
	int height = bm.getHeight();
	int color = 0, colorBefore = 0;
	int a, r, g, b;
	int r1, g1, b1;

	int[] oldPx = new int[width * height];
	int[] newPx = new int[width * height];

	bm.getPixels(oldPx, 0, bm.getWidth(), 0, 0, width, height);
	for (int i = 1; i < width * height; i++) {
		colorBefore = oldPx[i - 1];
		a = Color.alpha(colorBefore);
		r = Color.red(colorBefore);
		g = Color.green(colorBefore);
		b = Color.blue(colorBefore);

		color = oldPx[i];
		r1 = Color.red(color);
		g1 = Color.green(color);
		b1 = Color.blue(color);

		r = (r - r1 + 127);
		g = (g - g1 + 127);
		b = (b - b1 + 127);
		if (r > 255) {
			r = 255;
		}
		if (g > 255) {
			g = 255;
		}
		if (b > 255) {
			b = 255;
		}
		newPx[i] = Color.argb(a, r, g, b);
	}
	bmp.setPixels(newPx, 0, width, 0, 0, width, height);
	return bmp;
}