TC5747 Datasheet, PDF (12/44 Pages) List of Unclassifed Manufacturers – Single Chip CMOS Imager with Integrated Image Signal Processor and JPEG Codec

TC5747 Data Sheet
Single Chip CMOS Imager
2.3 IMGA
The IMGA unit controls the image array and the analog processing unit. It produces the various timing
controls, performs the “Mirror” transformations and the “Fixed Pattern Noise” corrections. After receiving
the array pixels (the ADC output) and performing the required corrections and offsets, the data is sent to the
YUVR unit for processing, or to the PVI or SVI unit for Bayer output.
2.4 YUVR
The YUVR unit transforms the Bayer data received from the IMGA unit into YUV or RGB data by applying
several image reconstruction and correction algorithms. Demosaicing, dynamic range enhancement, digital
gain, filter downscaling, sharpening or blurring, color correction, gamma correction, RGB to YUV
conversion, YUV-to-RGB conversion and cropping for display are all performed in the YUVR unit. Resizing of
the image can be done by 2X – 8X to achieve target LCD screen size with full field of view.
2.5 JPEG
The JPEG unit performs encoding or decoding of JPEG images. In encode mode it receives YUV 4:2:2 data,
and compresses the image into a JPEG stream. The JPEG compressed image is stored in RAM that is
accessible to the CONT unit core and to the I²C interface. The JPEG unit can also be configured to send out
the RAM content to one of the output units, with optional ancillary data header and checksum.
In decode mode, the compressed code is written to the Code memory, and the JPEG unit decodes it into YUV
4:2:2, 4:2:0 or 4:1:1 data.
4:2:0 and 4:1:1 formats are interpolated into 4:2:2 format. YUV data are then sent to the YUVR unit for resizing
and cropping. From the YUVR unit the decoded image is sent to the Parallel Video Interface unit for display.
Compression of a display ready image, after scaling and overlay of screen bitmap is also supported.
The JPEG unit can also output a thumbnail image.
2.6 PVI and SVI
The Parallel Video Interface (PVI) and Serial Video Interface (SVI) units are the output interfaces of the
TC5747 device. Each interface can be configured to output one of several streams (Bayer, YUV 4:2:2, RGB,
JPEG). The PVI can be configured as a parallel video interface or as a serial output interface.
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