Patent
Quality based image compression
Kadayam Thyagarajan,Morley Steven A +1 more
- 26 Jan 2001
94
TL;DR: In this article, a 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 (100) is claimed.
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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 (100) is claimed. A block size assignment element (120) in an encoder element (104) 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 (124). The frequency domain values are quantized (132, 134, 136, 144, 148) 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 (152) in preparation for transmission.
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Citations
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TL;DR: In this article, a video encoder is configured to encode a coded unit comprising a plurality of video blocks, wherein at least one of the video blocks comprises a size of more than 16×16 pixels.
287
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TL;DR: In this article, a method of processing multimedia data includes classifying content of multimedia data, and encoding the multimedia data in a first data group and in a second data group based on the content classification.
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Vijayalakshmi R. Raveendran,Gordon Kent Walker,Tao Tian,Phanikumar Bhamidipati,Fang Shi,Peisong Chen,Sitaraman Ganapathy Subramania,Seyfullah Halit Oguz +7 more
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TL;DR: In this article, a method of processing multimedia data includes obtaining content information of multimedia data, and encoding the multimedia data so as to align a data boundary with a frame boundary in a time domain, wherein said encoding is based on the content information.
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TL;DR: In this paper, video decoding innovations for multithreading implementations and graphics processor unit (GPU) implementations are described, where a decoder uses innovations in the areas of layered data structures, picture extent discovery, a picture command queue, and/or task scheduling for multi-reading.
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Raveendran Vijayalakshmi R,Phanikumar Bhamidipati,Gordon Kent Walker +2 more
- 10 Mar 2006
TL;DR: An apparatus and method for processing multimedia data, such as, for example, video data, audio data, or both video and audio data for encoding utilizing a determined content classification is claimed as mentioned in this paper.
124
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TL;DR: An image compression system and method for compressing image data for transmission each block and corresponding sub-blocks of pixel data is subjected to a discrete cosine transform (DCT) operation.
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Patent
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Gerrit Johan Keesman
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Patent
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56
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