Lecture 1: Introduction to Biological Vision - Vision Research ...
Lecture 1: Introduction to Biological Vision - Vision Research ...
Lecture 1: Introduction to Biological Vision - Vision Research ...
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ontal and vertical spatial frequencies? (Answer: this is the spatial frequency equivalent <strong>to</strong> applying a Laplacian<strong>to</strong>r in the space domain).an play with changes <strong>to</strong> the amplitude or phase spectrum <strong>to</strong> see what happens. For example, what happens if youply the amplitude spectrum by an array whose values are proportional <strong>to</strong> 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
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