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The Motorbikes (Side) dataset was collected by undergraduate students at Caltech in February 2001 from the web. It contains 826 side‑view images of motorcycles in JPEG format. Additionally, the dataset includes a MATLAB file ImageData.mat, which contains an 8 × 826 matrix SubDir_Data; each column stores the coordinates of a motorcycle in the image in the format [x_bot_left y_bot_left x_top_left y_top_left x_top_right y_top_right x_bot_right y_bot_right].