Question

需要帮助！我有这个代码。如何绘制68并在相机预览中看到它们？

public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
        rgba = inputFrame.rgba();
       try {
            Bitmap bmp = matToBitmap(rgba);
           points = getLandmark(bmp, this, predictorPath); // getting 68 points

          drawPoints(bmp, points);

        } catch (Exception e) {
            Log.i(TAG, "bitmap error! " + e.getMessage());
        }
        return rgba;
    }

编辑：添加了此方法，但没有任何反应

public void drawPoints(Bitmap bitmap, List<Point> points) {

        Canvas canvas = new Canvas(bitmap);

        Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setColor(Color.RED);
        float radius = 4f;

        // draw points
        for(Point point : points) {
            canvas.drawCircle(point.x, point.y, radius, paint);
        }
    }

Answer 1

尝试使用Canvas在位图上绘制内容。 Here您可以找到有关此内容的更多信息。

Answer 2

您可以在Canvas类的帮助下在Bitmap上绘制点。一个例子：

public void drawPoints(Bitmap bitmap, List<Point> points) {
    // a canvas for drawing on the bitmap
    Canvas canvas = new Canvas(bitmap);
    // a paint to describe how points are drawn
    Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
    paint.setColor(Color.RED);
    float radius = 4f;

    // draw points
    for(Point point : points) {
        canvas.drawCircle(point.x, point.y, radius, paint);
    }
    // the bitmap has now been updated
}

这可以根据您接收点的方式以及点的显示方式（大小，颜色，形状等）进行更改。
对于实时绘图，您可能希望缓存Paint对象。

如何在实时图像上绘制地标点

2 个答案: