A HoughMap is an 8-bit quantitization of the Hough space after performing a Hough transform on a ByteMap. The theta axis corresponds to the x-axis and the rho axis to the y-axis of the image. The width of a pixel in the HoughMap is equal to the resolution in theta and the height of a pixel to the resolution in rho. Therefore, the HoughMap can be understood as a 8-bit map (i.e. a ByteMap) with a given resolution in x and y.
A HoughMap is saved in a BMP file and a property file containing the resolution in theta and rho.