tc5747 ETC-unknow, tc5747 Datasheet - Page 15

• Manufacturer Part Number: tc5747
• Description: Single Chip Cmos Imager With Integrated Image Signal Processor Jpeg Codec
• Manufacturer: ETC-unknow

TC5747 Preliminary Data Sheet
Single Chip CMOS Imager
TransChip supplies sample C code, which shows how to upload the firmware and use the host commands
(software API). The sample includes all the needed C header files. The supplied firmware comes with preset
default values for the various controls. Thus even if no single host commands is performed the firmware
ensures that the sensor is running properly according to a preset default set.
TransChip also supplies a released version of the firmware.
The host commands are fully detailed in a separate document.
2.13 Bayer to YUV Translation Unit (YUVR)
The
control bus. The Bayer image is received from the
the PVI unit for output out of the device. While processing the image, statistics are calculated by the
unit. After completing the processing of an image, the
YUVR
the results through the main control bus.
The
reconstructed. The input accuracy is 10 bits. The
correction algorithms and generates the
Digital color processing includes: demosaicing, dynamic range enhancement, digital gain, filter
downscaling, sharpening or blurring, flicker detection and removal, color and white balance correction,
gamma correction, color suppression, zoom by 2X or 4X,
down sample and cropping of
YUVR
Zoom is performed by creating a full resolution image from a small region in the center of the image. The
small region is blown up by 2X or by 4X to the target image size. The missing pixels are interpolated from
the original pixels using a filter to provide a smooth appearance.
2.14 JPEG Compression Unit (JCOR)
The
compression. A 25K Byte memory is used for the
Raster-to-Block operation buffer and a
full VGA-sized compressed image at a compression ratio of up to 1.7 bits per pixel.
The partition of the memory is fully configurable.
YUVR
YUVR
When a higher compression ratio is used, several images can be stored in the memory. For example,
when capturing a VGA-sized image, three compressed images of 0.5 bits per pixel can be stored in the
64K Byte
When capturing a smaller image, a smaller buffer is required for the Raster-to-Block operation.
Therefore a larger
ratio.
JPEG
unit.
thus signifies to the
unit receives the
is the color-processing unit. The unit’s parameters and mode registers are loaded through the
unit receives the
JPEG
-code memory section.
JPEG
CONT
Bayer
-code memory section can be allocated for support of a lower compression
YUV 4:2:2
RGB
that the statistics for the current image are ready, and the
grid as input. For each pixel, two color values are missing and need to be
for display,
YUV
JPEG
image data from the
representation of the image.
-code memory section. The 64K Bytes of memory can hold a
TransChip
RGB
JPEG
IMGA
YUVR
9
formatting (
YUVR
compression process. The memory is divided into a
unit, processed by the
RGB
unit reconstructs the
unit produces an interrupt to the
to
YUVR
6:6:6, 5:6:5, 4:4:4
YUV
conversion,
unit, and performs real-time
YUVR
RGB
) are all performed in the
YUV
unit, and transferred to
-to-
per pixel, performs
RGB
CONT
CONT
conversion,
may read
unit. The
YUVR
JPEG