German Traffic Sign Detection Benchmark - 3 different types of backdoor patterns added

Datasets are split in Training and Test datasets GTSRB_backdoor_green_1.zip - a green squared pattern sized 1% of the images area is added randomly around the center in an interval of +/-20% of time images width and height GTSRB_backdoor_green_0_5.zip - a green squared pattern sized 0.5% of the images area is added randomly around the center in an interval of +/-20% of time images width and height GTSRB_backdoor_black_1.zip - a black squared pattern sized 1% of the images area is added randomly around the center in an interval of +/-20% of time images width and height