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. Author manuscript; available in PMC: 2011 Jun 23.
Published in final edited form as: Neural Comput. 2009 Jun;21(6):1485–1519. doi: 10.1162/neco.2009.04-08-773

Figure 4.

Figure 4

Joint histograms of pairs of samples from transformed images, at three different spatial separations. Lines indicate level sets of constant probability, chosen such that a gaussian density will have equispaced contours. Data taken from a single test image. RAW: original bandpass filtered image. ICA: data after ICA transformation. SPH: sphericalized synthetic data (randomized directions). FAC: factorialized synthetic data (independently sampled marginal components). KURT: kurtosis of marginal density, as as function of marginal direction, for RAW (thin line), SPH (dashed line), and FAC (thick line) data.