Noise Reduction and Edge Enhancement Based on Band-Pass Epsilon-filter

Band-pass bilateral filter is an improved bilateral filter which does not have low-pass characteristics but has band-pass characteristics to enhance image contrast around edges. However, the computation time is relatively large due to Gaussian calculation in all pixels. To reduce the calculation cost, we look to a nonlinear filter called epsilon-filter and propose an advanced epsilon-filter which does not have low-pass charactersitics but has band-pass characteristics to enhance the image contrast around edge, namely band-pass epsiv-filter. Due to its simple design, the calculation cost is relatively small the same as epsiv-filter. To show the effectiveness of the proposed method, we also report the results of some comparative experiments concerning the filter characteristics and computational cost.