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STV0974ETR Datasheet(PDF) 13 Page - STMicroelectronics

No. de pieza STV0974ETR
Descripción Electrónicos  Mobile Imaging DSP
PDF  69 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STV0974ETR Datasheet(HTML) 13 Page - STMicroelectronics

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Functional description
STV0974
13/61
4.4
Video compression (VC)
Real time video compression permits a frame rate of 30 frame/s in any mode at VGA.
The JPEG compression engine is a standard baseline sequential JPEG encoder
[2].
The compression ratio can be modified by applying a multiplication factor on the quantization table.
The quantization table can be scaled from a factor of 1/8 to a factor of 8.
The STV0974 video compression block includes a baseline DCT JPEG encoder compliant with
ISO DIS 10918-1.
The JPEG encoder has the following characteristics:
● baseline sequential DCT based encoder
● YUV 422 encoding only
● up to VGA image size
● scalable quantization table
● standard quantization table
● standard Huffman coder
The encoder top level block diagram is presented in
Figure 3.
The input data is a YUV 422 8-bit data stream in raster order. The output data is a baseline JPEG
data stream.
Figure 3: Encoder top level block diagram
Raster
to block
converter
Discrete
Cosine
transform
ZigZag
transform
Entropy
coder
Quantize



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