Question

我正在尝试从位图（从矩阵创建）中创建和保存Alpha蒙版。由于某些原因，尝试将Alpha纹理（ALPHA_8配置格式）保存到磁盘失败。甚至可以将掩码保存到磁盘吗？

代码如下：

Mat image1 = new Mat(8, 16, CV_8UC4, new Scalar(0, 0, 0, 0));
Mat image2 = new Mat(2, 16, CV_8UC4, new Scalar(0, 0, 0, 0));
Mat image3 = new Mat(4, 6, CV_8UC4, new Scalar(0, 0, 0, 0));
Mat image4 = new Mat(4, 4, CV_8UC4, new Scalar(255, 255, 255, 255));
List<Mat> src = Arrays.asList(image3, image4, image3);
Mat dst1 = new Mat();
Core.hconcat(src, dst1);

List<Mat> src2 = Arrays.asList(image1, image2, dst1, image2);
Mat dst = new Mat();
Core.vconcat(src2, dst);
Bitmap bmp = Bitmap.createBitmap(dst.cols(), dst.rows(), Bitmap.Config.ARGB_8888);
Utils.matToBitmap(dst, bmp); // dst is my openCV matrix
Bitmap alpha = bmp.extractAlpha(); 
// alpha bitmap shows perfectly in the IDE, it's ALPHA_8

FileOutputStream out = new FileOutputStream(new File(appDir, "testMask16x16.png"));
boolean result = alpha.compress(Bitmap.CompressFormat.PNG, 100, out); 
// result is false, i.e. the compression fails. 
out.flush();
out.close();

更新：

我试图直接使用openCV保存矩阵：

Imgcodecs.imwrite(new File(appDir, "testMask16x16.png").toString(), dst);

它确实保存了它，但是在大小上似乎与保存ARGB_8888格式相同，所以我猜它是ARGB_8888格式。：-（

创建和保存Alpha纹理（蒙版）

0 个答案: