Motorbikes (Side) dataset. Collected by undergrads at Caltech (Feb '01) from the web. 826 images of motorbikes from the side. JPEG format.
ImageData.mat is a MATLAB file containing the variable SubDir_Data which is an 8 x 826 matrix.
Each column of this matrix hold the coordinates of the bike within the image, in the form: [x_bot_left y_bot_left x_top_left y_top_left x_top_right y_top_right x_bot_right y_bot_right].

Please cite the below wherever required.
Perona, P. (2022). Caltech Motorcycles 2001 (1.0) [Data set]. CaltechDATA. https://doi.org/10.22002/D1.20088