I don’t think so because the naked eye is visible … all the images are 800x600 and most of the boxes are visible to the naked eye … I don’t think the data set is the problem, I have tried efficient models (d2 and d3) to lower the learning rate because if I did not start training, it gave me a nan in losses … the truth is that I am a bit lost and I don’t know which parts of the pipeline to modify or if I should look for another model … many thanks for your interest and help.