Image processing apparatus and method for format conversion

Details Image processing apparatus and method for format conversion Image processing apparatus and method for format conversion

2009-03-09

2011-12-06

Hsia, Sherrie (Department: 2422)

Television

Format conversion

Specified chrominance processing

C348S458000

Reexamination Certificate

active

08072541

ABSTRACT:
A signal processing apparatus converts interlaced 4:2:2-format video signals including a luminance component and two chroma components into interlaced 4:2:0 format video signals. A downsampling low-pass filter has such a group delay that a modulo-1 remainder of the group delay at frequency ω=0 is substantially equal to 0.25. The downsampling low-pass filter is designed together with an associated upsampling low-pass filter such that the first downsampling low-pass filter and the upsampling low-pass filter substantially satisfy perfect reconstruction filter bank condition, and such that a sum of the group delay of the first downsampling low-pass filter and a group delay of a normalized filter obtained by making the sum of all the coefficients of the upsampling low-pass filter equal to 1 is substantially equal to an integer number at frequency ω=0.

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