Exercise:PCA and Whitening
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=== Step 5: ZCA whitening === | === Step 5: ZCA whitening === | ||
- | Now implement ZCA whitening to produce the matrix <math>x_{ZCAWhite}</math>. Visualise <math>x_{ZCAWhite}</math> and compare it to the raw data, <math>x</math>. You should observe that whitening results in, among other things, enhanced edges. | + | Now implement ZCA whitening to produce the matrix <math>x_{ZCAWhite}</math>. Visualise <math>x_{ZCAWhite}</math> and compare it to the raw data, <math>x</math>. You should observe that whitening results in, among other things, enhanced edges. Try varying epsilon (1, 0.1, 0.01) and see what you obtain. |
<table> | <table> |