The 'long' type can be 32 bits or 64 bits depending on what compiler
you are using (LLP64 vs LP64). If the long type is 64 bits the
biHeight variable will receive a very big number when the bmp image
height is negative, causing a std::bad_alloc exception when calling
the 'image.set_size' method.

hough_transform objects and made some argument names more consistent.

outputs.  Also cleaned up the code a bit.

rectangle.

previous dlib versions.

you can chain calls easily.

numpy array as input.

made it more robust to funky inputs.