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MB86R02 'Jade-D' Hardware Manual V1.64
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11
The Horizontal LPF is deactivated (set to bypass) by setting the coefficient code to "00".
Note: In the case of Native RGB mode (NRGB=1), only a setup of CHLPF_Y code becomes
effective.
(3) Horizontal Downscale and Upscale processing
Bits 15:0 of the capture scale register (CSC) are used for both horizontal downscale and upscale
processing.
The horizontal downscaling of an incoming data stream is done before writing to VRAM. Upscaling
in the horizontal direction is done after reading from VRAM.
The interpolation filter processing of the luminance (Y) signal is done using cubic interpolation
(Cubic Interpolate) method. The interpolation filter processing of chrominance (Cb and Cr) signal is
done using bilinear interpolation (BiLinear Interpolate) method. The interpolation filter processing of
a Native-RGB signal is done by cubic interpolation (Cubic Interpolate) method.
(4) Vertical low-pass filter processing
A preprocessing vertical low-pass filter can be applied to an image before it is scaled down
vertically. The vertical LPF can be activated, regardless of whether an image is scaled up or down
in the vertical axis.
The vertical low-pass filter consists of FIR filters (finite impulse response filters) with three taps.
Coefficients are specified in the CLPF (Capture Low Pass Filter) register:
CVLPF_Y
CVLPF_C
The coefficients are specified by a 2-bit coefficient code set independently for the luminance (Y)
signal and chrominance (Cb and Cr) signals. The coefficient is a symmetric coefficient.
18-46
0
3/16
3/32
8/32
Vertical LPF Luminance element and RGB element coefficient
code
Vertical LPF chrominance element coefficient code
10/16
3/16
10/32
10/32
0
3/32
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