3 Signals Cross Correlation from Their Power Spectral Densities? 2 What is the condition under which the length of shortest 4-path equal to $D_4$ distance? 2 Where 2-D DFT is necessary in image processing applications instead of 2-D DCT? 1 Mathematics behind the creation of 3d face mask at runtime 1 What distance metric can I use for comparing image features in a nearest neighbour algorithm?

### Reputation (434)

 +20 Simple Image Edge Preserving Filter +35 What is the condition under which the length of shortest 4-path equal to $D_4$ distance? +10 Mathematics behind the creation of 3d face mask at runtime +2 Estimating Average HR from PPG sensor

### Questions (2)

 4 Simple Image Edge Preserving Filter 3 The Proper Way to Do Sinc Downsampling (DFT Downsampling) for Uniformly Sampled Discrete Signals with Finite Number of Samples

### Tags (29)

 4 image-processing × 5 3 power-spectral-density 4 cross-correlation × 2 2 dft × 2 3 fft × 2 2 audio × 2 3 distance-metrics × 2 2 image 3 correlation 2 dct

### Bookmarks (5)

 28 What Is the Best First Order IIR (AR Filter) Approximation to a Moving Average Filter (FIR Filter)? 6 Which Noise Reduction Algorithms Are Used in Commercial RAW Image Processors? 4 Weighted Sum of Auto Correlation - Lower Bound 4 Using MATLAB xcorr() to Find a Signal Hidden Behind Noise 3 Channel Estimation / Equalization - Estimate Channel Inverse Using White Noise Statistics Only

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