VS6724 Datasheet, PDF (60/118 Pages) STMicroelectronics – 2 Megapixel single-chip camera module

Programming model and register description
VS6724
Table 14. PipeContext0 (continued)
Index
PipeContext0⁽¹⁾
bJpegSqueezeSettings
0x03c0
Default value
Purpose
Type
Possible values
0x00
Select JPEG compression control
BYTE
<0> User Squeeze mode - Sets the VC squeeze setting as user
squeeze (e.g. quality based setting). Low, medium or high quality factor
should be set to override these settings
<1> Auto Squeeze mode - Sets the VC squeeze setting as auto squeeze
(file size based setting).
<2> Auto still capture mode - If the host is taking only one still, the
engine calibrates and waits for 5-10 frames to work out compression
settings to reach optimum squeeze for target file size.
bJpegTargetFileSize
0x03c3(MSB)
0x03c4(LSB)
Default value
Purpose
Type
0x02ee (750KB)
sets target file size KByte
UINT16
bJpegImageQuality
0x03c6
Default value
Purpose
Type
Possible values
0x00
Sets target JPEG image quality setting for Auto Squeeze mode
BYTE
<0>High Quality
<1> Medium Quality
<2> Low Quality
bJpegImageFormat
0x03c8
Default value
Purpose
Type
Possible values
0x00
Sets image format supplied to JPEG engine
BYTE
<0>YCbCr 422 <1> YCbCr 420
bMinScalerFactor
0x03cc
Default value
Purpose
Type
Possible values
0x10
Sets the minimum scaling factor which can be achieved by the zoom
operation, this can be used to limit the max PCLK rate.
BYTE
0x00 - 0xff
1. Can be controlled in all stable state.
# denotes registers where changes will only be consumed during the transition to a RUN state.
2. It is possible to switch between any YCbCr (422) mode, RGB mode and Bayer 10bit or move between YCbCr 400 and a
Bayer8 mode without a requiring a transition to STOP, it is not possible to move between these groups of modes without
first a transition to STOP then a BOOT.
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