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Appendix D: On-Board Video
timing information.
The scaling ratio is re-adjusted whenever a
different input mode is detected. The ratio is then fed to the buffer
memory read control logic to fetch the image data with the right
sequence and timing. Some of the image data may be read more than
once to achieve the scaling effect. The SP1015 can only perform up-
scaling, i.e., resolutions smaller or equal to the panel can be fit into the
panel.
Image Interpolation
A basic image scaling algorithm replicates the input images to achieve
the scaling effect, however, this replication scheme usually results in
poor image quality. To achieve better and improved image quality, the
SP1015 support image interpolation through a proprietary interpolation
algorithm.
Dithering
These controllers support 16.7 million true colors for a 6-bit panel. Two
dithering algorithms are implemented and users can choose between
them. The first one is area-based dithering, and the second one is
frame-based frame modulation, which is also called frame rate control.
Text Enhancement
In order to generate a good picture, the SP1015 incorporate a
proprietary scheme to detect text and non-text picture.
Then the
appropriate process is applied to improve the text image based on the
detection of the incoming source. By using this text enhancement
function correctly, the text image will look more pleasant and nearly
perfect after scaling up or down.
Sharpness Enhancement
No matter how many times the original image got enlarged or reduced
by the internal interpolator, the SP1015 can always enhance the overall
image sharpness (edge) to different degrees for various requirements
through its embedded powerful DSP arrays. The sharpness can be
adjusted bi-directionally, which means it can either be sharper or softer
to a certain point.
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