Help with instance detection project, classical CV

Hi everybody, I'm working on an instance detection problem, given some reference image of supermarket products and some noised scenes the program should be able to identify the reference in the scene and draw a polygone around it.

To do this I'm applying a bilateral filter and a median filter to the noised scene, after that I'm using a sift detector, KNNMatch, than I apply a threshold to the found point and with the remaining point I compute an homography …

computervision detection filter identify image instance median products project reference supermarket