18-45
MB86R02 ‘Jade-D’ Hardware Manual V1.64
18.7.4.3
Flow of image processing
Captured images displayed on the L1 layer window are subject to the image processing flow shown
below:
Figure 8.1 Flow of image processing
(1) Non-interlaced interpolation processing
When the VI (vertical interpolation) bit of the video capture mode register (
VCM
) is 0, an interlaced
screen is interpolated vertically using the data from the same field. A screen is doubled vertically.
When VI is 1, it is not interpolated vertically.
(2) Horizontal low-pass filter processing
When scaling a picture horizontally, a preprocessing low-pass filter can be applied, regardless of
whether the picture is being up- or downscaled in order to optimize picture quality. For more
detailled knowledge in this complex field, please refer to external sources such as: `Video
processing for multimedia systems', by Gerard de Haan I SBN: 90-9014015-8, Eindhoven Sept.
2000.
The horizontal low-pass filter consists of FIR filters (finite impulse response filters) with five taps.
Coefficients are specified in the CLPF (Capture Low Pass Filter) register:
CHLPF_Y
Horizontal LPF Luminance element and RGB element
coefficient code
CHLPF_C
Horizontal LPF chrominance element coefficient code
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.
CHLPF_x
K0
K1
K2
K3
K4
00
0
0
1
0
0
01
0
1/4
2/4
1/4
0
Scaler
Video-
Input
(656/RGB)
Video
Output
MB86R02
horizontal
LPF
horizontal
down scaling
vertical
down scaling
vertical
LPF
horizontal
up scaling
Display Controller
Non-interlace
interpolation
On / Off
C
a
pt
ur
e
buf
fe
r c
ont
rol
le
r
V
RAM
Color conversion
matrix
656(YUV422),RGB
RGB
YUV422
YUV / RGB
vertical
up scaling
vertical
interpolator
horizontal
interpolator
Line
Buffer
Содержание MB86R02
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