Lecture 1: Introduction to Biological Vision - Vision Research ...

ontal and vertical spatial frequencies? (Answer: this is the spatial frequency equivalent to applying a Laplaciantor in the space domain).an play with changes to the amplitude or phase spectrum to see what happens. For example, what happens if youply the amplitude spectrum by an array whose values are proportional to the negative of the sum of the squares of the“Neural image” or“channel”, based on ae assorted functions and filtersconvolution model20 Fourier_neural_Out[117]=W =R i,j =In[118]:=filterft = Fourier@shift@filter, hsizeDD;ArrayPlot@fface = Chop@t = InverseFourier@filterft faceftDD,Mesh Ø False, ColorFunction Ø "GrayTones", DataReversed Ø TrueDx,yW i x,j y L x,y]=The DensityPlot above shows a view of the "receptive field" of an oriented band-passOut[118]=cell. Let's plot the filter along thediagonal:48Wednesday, August 29, 12DataReversed Ø TrueD