Understanding HistogramOfOrientedGradients.java

[iskanderuse]

Typically, a feature descriptor (HOG descriptor) converts an image of size width x height x 3 (channels ) to a feature vector / array of length n.
The ProcessImage method in the file HistogramOfOrientedGradients.java has desription "Process image looking for corners" and returns "list of found corners (X-Y coordinates)".
Can You explain what is doing this class and how to interpret the return values?
Thank You.