conversion from pixel xy to gps location

[temi92]

AnimalDetectionDrone/app/src/main/java/cameraopencv/java/dji/com/ObjectDetection.java

Line 256 in e153eb4

double x_scalingfactor = image_size.x/720;

Hi i cam across your repo and i am working on quite a similar project i see you have done some conversion from xy pixel position to GPS coordinate and you have done some scaling . could you please explain why this was necessary? have you got any resources to help with the maths.
Kind Regards