On the Design of Finite Wordlength Iir Filters for Video Applications
نویسندگان
چکیده
This paper addresses the problem of designing nite precision one-dimensional (1-D) innnite impulse response (IIR) digital lters for video processing. The design algorithm is based on simultaneous minimization of magnitude, phase and stability errors in a discrete space of solutions using simulated annealing. It is demonstrated that the approach results in lters characterized by a substantially reduced non-linearity of the phase response in lter pass band, which is critical in any video processing application. To reduce image degradations due to ripples of the lter step response, another error term is introduced into the cost function. It is demonstrated that this additional term permits signiicant reduction of step response overshoots, and thus the visibility of degradations in a ltered image. The designed IIR lters are compared with their nite impulse response (FIR) counterparts in terms of characteristic parameters as well as distortion visibility in processed images.
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Two-Channel IIR/FIR Filter Banks with Very Low-Complexity Analysis or Synthesis Filters: Finite Wordlength Effects
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