我设法绘制了一个叠加矩形,以便矩形中的内容是唯一要处理的内容,应用程序应该忽略相机区域的其余部分。link to Screenshot
问题是我想在onimagaavailable函数上裁剪上面的矩形,如下所示:
@Override
public void onImageAvailable(ImageReader reader) {
Image img = reader.acquireLatestImage();
//THIS IS WHERE I WANT TO CROP THE IMAGE TO ONLY SHOW WHAT WAS IN THE
// ABOVE DRAWN RECTANGLE BUT I DONT KNOW HOW, I HAVE GOOGLED FOR THE
// PAST WEEK ON THIS
//after processing i should pass the image to my opencv processing
//algorithm
process(img)
}
这是我在camera2
上绘制矩形叠加层的代码 @Override
protected void onDraw(Canvas canvas) { // Override the onDraw() Method
super.onDraw(canvas);
paint.setStyle(Paint.Style.STROKE);
paint.setColor(Color.WHITE);
paint.setStrokeWidth(10);
int width = canvas.getWidth() / 2;
int height = canvas.getHeight() / 4;
int height1 = canvas.getHeight() / 3;
int height_1 = canvas.getHeight() / 10;
int fin = canvas.getWidth() + canvas.getWidth() / 3;
int top = height / 4;
Log.e("top", top + "");
canvas.drawRect(canvas.getWidth() - (canvas.getWidth() - 150),
canvas.getHeight() - fin, canvas.getWidth() - 150, height + top, paint);
}
请帮助/告诉我可以使用哪些代码从ImageReader图像裁剪矩形,以便我可以将裁剪后的图像传递给我的处理算法
答案 0 :(得分:3)
在onImageAvailable()中,您可以使用 Bitmap.createBitmap,如果它是转换为位图的JPEG格式
Rect rectCrop = new Rect(left,top,right,bottom);
Bitmap bitmapRotated = Bitmap.createBitmap(bitmap, rectCrop.left, rectCrop.top, rectCrop.width(), rectCrop.height(), mat, true);
如果你使用YUV你可以减少内存并使用带有矩形的compressToJpeg,它会更轻一些
yuv.compressToJpeg(rect, compress, out);