The retina –p(u, v) plane is divided into M × N = 106 patches according to the receptive field sizes of ganglion cells. A simpler approach is based on the complexity of the image, that is, according to the distribution of basic characteristics (line, corners, and curves for example) in an image. An A4-sized image can be divided into 128 or 64 patches in the first stage, and at the second stage, for pitch of the image can be divided by 8, 16, and so on. It is worth noting that when the total number of first-stage divisions is large, the total number of second-stage divisions should be small .
Songnian et al. BMC Neuroscience 2014 15:50 doi:10.1186/1471-2202-15-50