Public Version
Camera ISP Functional Description
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6.4.7.1.14.2.1 Chrominance Suppression
Occasionally, in very bright portions of an image, only one or two of the color channels are saturated,
while the remaining channel(s) are not. This can lead to a false-color effect. One common example is the
appearance of pink where white should be. Chrominance suppression can be used to correct this issue.
Chrominance suppression can be enabled or disabled using the
[16] SUPEN parameter.
NOTE:
Some details of this feature are not available in the public domain.
6.4.7.1.14.2.2 Contrast and Brightness
The luminance component can be adjusted for contrast (scaling/multiplication) and brightness
(offset/addition). Contrast is set in the
[15:8] CNT field (U8Q4 precision), and brightness
is set in the
[7:0] BRT field (U8Q0 precision).
6.4.7.1.14.2.3 Downsampling and Output Clipping
The 4:2:2 conversion module converts image data to YCbCr-4:2:2 format by averaging every other Cb and
Cr component in the horizontal direction. Before outputting the data, the preview engine performs clipping
on the YCC components separately. The minimum and maximum threshold values for the Y and C values
are specified using the
register. If no clipping is required, the register must be set to its
reset values of 0xFF for the maximum Y and C values, and 0 for the minimum Y and C values.
6.4.7.1.15 Camera ISP VPBE Preview Write-Buffer Interface
The output of the preview engine may be passed directly to the Resizer (
[19] RSZPORT)
and/or written to memory (
[20] SDRPORT).
If the output is written to memory, the write address (
) and line offset
(
) must be on 32-byte boundaries. The output format of the YCC data is
programmable by setting the
[18:17] YCPOS parameter.
The final width and height of the output vary depending on which processing functions are enabled.
indicates how many edge pixels/lines are truncated by enabling certain modules in the preview
engine. These values must be subtracted from the input height and width after the averager to determine
the size of preview-engine output.
Table 6-40. Camera ISP VPBE Preview Image Cropping by Preview Functions
Image Cropping by Preview Functions
Function
Pix/Line
Lines
Horizontal median filter
4
0
Noise filter
4
4
CFA (Bayer, Super CCD Honeycom or RGBE)
4
4
Color suppression OR luminance enhancement
2
0
Maximum total
14
8
NOTE:
Different CFA modes are mutually exclusive.
6.4.7.2
Camera ISP VPBE Resizer
6.4.7.2.1 Camera ISP VPBE Resizer Features
The Resizer module enables image upsampling and downsampling, see
. The following
features are supported:
•
Flexible input sources:
–
Preview module: Enables on-the-fly processing
1212
Camera Image Signal Processor
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated
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