Image analysis – Image compression or coding – Adaptive coding
Reexamination Certificate
2006-11-13
2008-12-02
Chen, Wenpeng (Department: 2624)
Image analysis
Image compression or coding
Adaptive coding
C382S240000
Reexamination Certificate
active
07460723
ABSTRACT:
A system and method for quality-based image compression utilizing adaptively sized blocks and sub-blocks of discrete cosine transform coefficient data and a quality based quantization scale factor is claimed. A block size assignment element in an encoder element selects the block or sub-block of an input block of pixel data to be processed. Blocks with variances larger than a threshold are subdivided, while blocks with variances smaller than a threshold are not subdivided. A transform element transforms the pixel values of the selected blocks into the frequency domain. The frequency domain values are quantized either on a block by block basis or a frame by frame basis utilizing a scale factor that correlates with the quality of the image. The data is then serialized and coded in preparation for transmission.
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Morley Steven A.
Thyagarajan Kadayam
Chen Wenpeng
Evans Matthew J.
Franks Ross L.
QUALCOMM Incorporated
Rouse Thomas R.
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