18-43
MB86R02 ‘Jade-D’ Hardware Manual V1.64
18.7.4 Scaling
18.7.4.1
Downscaling Function
If the CM (Capture Mode) bits of the video capture mode register (
VCM
) are set to 11, the capture
controller reduces the incoming video size. The amount of reduction can be set independently in both
vertical and horizontal axes whereby the units used for the calculation are different (!). The reduction is
determined
per line on the vertical axis
and in
2-pixel units on the horizontal axis
. The scale factors
are defined by seperate 16-bit fractional values (filter coefficients), whereby the integer part of each is
represented by 5 bits and the fractional part is represented by 11 bits. Valid setting values range from
0800
H
to FFFF
H
. The vertical scaling factor is determined using the filter coefficient set in the VSCF
and VSCI bitfields of the capture scale register (
CSC
). The horizontal scaling factor is set using the
filter coefficient set in the bitfields HSCI and HSCF of the same register. The default value of the
CSC
register is 08000800
H
(0x800 = 2048 therefore – using the formula shown below - 1:1 scaling, i.e. no
scaling). An example of the settings required for vertical and horizontal reduction is shown below:
(2048 is a hardware fixed value!)
Reduction in vertical direction:
576
→
490
lines
: 576/490 = ratio of 1.176
1.176
×
2048 = 2408 (= filter coefficient of 0x0968 in hexadecimal)
Reduction in horizontal direction:
720
→
648
pixels
: 720/648 = ratio of 1.111
1.111
×
2048 = 2275 (= filter coefficient of 0x
08E3
in hexadecimal)
The result to be set in the
CSC
register is therefore: 0968
08E3
H
The capture horizontal pixel (
CHP
) and capture vertical pixel (
CVP
) registers are used to limit the
number of pixels output after scaling. Note that they are
not
used to set scaling values. Pixels that
exceed the values set in the
CHP
and
CVP
registers are simply dropped (clamp processing). Usually,
the defaults of these registers are used.
18.7.4.2
Upscaling Function
The capture controller is able to increase the size of a video capture picture by a factor of 2 in both
horizontal and vertical directions. This feature can be used to achieve the full-screen display of input
video streams which have a resolution which is less than the actual display size. In order to use the
up-scaling mode, the horizontal and vertical factor must be less than one.
Do not specify different scaling modes (downscaling/upscaling) for the horizontal and vertical factors!
Also initialize the following registers as follows:
Set the 'Magnify Scaling' bit (L1DM) in the L1EM register (L1 extended mode) register of the
display controller to '10'.
In the
CMSS
(Capture Magnify Source Size) register, set the source picture size (i.e. original,
prior to upscaling) using the CMSHP and CMSVL bitfields.
In the
CMDS
(Capture Magnify Display Size) register, set the final picture size (i.e. upscaled
after processing) using the CMDHP and CMDVL bitfields.
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