coordinates are biased about yolo_mark HOT 3 OPEN

Thank you for more detailed information.

• Yolo_mark works correctly
• x and y aren't top-left corner. x and y are center of bounded box in the Yolo:

  Yolo_mark/main.cpp

  Lines 306 to 309 in d0f23d8

  	float const relative_center_x = (float)(i.abs_rect.x + i.abs_rect.width / 2) / full_image_roi.cols;
  	float const relative_center_y = (float)(i.abs_rect.y + i.abs_rect.height / 2) / full_image_roi.rows;
  	float const relative_width = (float)i.abs_rect.width / full_image_roi.cols;
  	float const relative_height = (float)i.abs_rect.height / full_image_roi.rows;

• If you use cv::Rect(x_yolo * width_frame, y_yolo * height_frame, w_yolo * width_frame, h_yolo * height_frame); then OpenCV draws rectangle with top-left corner at x_yolo * width_image, y_yolo * height_frame that isn't correct.

You should use cv::Rect((x_yolo - w_yolo/2) * width_frame, (y_yolo - h_yolo/2) * height_frame, w_yolo * width_frame, h_yolo * height_frame); - this is correct.

See how it is calculated: https://github.com/AlexeyAB/darknet#how-to-train-to-detect-your-custom-objects

Where:

• <object-class> - integer number of object from 0 to (classes-1)
• <x> <y> <width> <height> - float values relative to width and height of image, it can be equal from 0.0 to 1.0
• for example: <x> = <absolute_x> / <image_width> or <height> = <absolute_height> / <image_height>
• atention: <x> <y> - are center of rectangle (are not top-left corner)

from yolo_mark.

Can you provide some more information, what kind of error did you get?
Show example with image and label, that has biased relative coords.

from yolo_mark.

this is what i get when draw the rect
x = x_yolo * width
y = y_yolo * height
width_obj = w_yolo * width_frame
height_obj = h_yolo * height_frame

seems to me that yolo_mark add some value to original width and height and then calculates relative coordinates, but it is strange for sure that i am first who found this out.
also one can see this difference with naked eyes comparing txt file coordinates and truth without even drawing any rectangles.
0 0.475781 0.663194 0.064062 0.345833
If you will not answer I am going to view code tomorrow.
thanks a lot for your open code and all efforts, its hard to overappreciate how much Redmon's darknet and your repo helps me in my learning progress and work.

from yolo_mark.