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US 7,623,721 B1Granted
High-speed dithering architecture
AssigneeMarvell International Ltd.
InventorBharat Pathak
Life of this patent
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Abstract
A filter for implementing Floyd Steinberg two-dimensional error diffusion algorithms allows high-speed processing of video and images. The filter is shown in direct form with proper bit precision with implementations that permit the filter to operate at high speed. Furthermore, a reduction in the gate count is achieved over the direct form. The results of static timing analysis obtained post synthesis are also summarized.
Claims20
A method for dithering, comprising:
- receiving a digital image signal, wherein the digital image signal comprises lines of pixel data, wherein each pixel comprises at least one word;
- reducing the number of bits in words in the digital video signal with a quantizer such that quantized words are formed;
- buffering lines of the quantized words in a memory;
- filtering the digital image signal by providing a feedback path to a filter that contemporaneously receives quantized words from the quantizer and quantized words from the memory;
- and
- providing the filtered digital image signal to an output device.
3 more elements
A pixel dithering system, comprising:
- a quantizer that is configured to reduce the number of bits in words of a digital video signal such that quantized words are formed, wherein the quantized words are associated with video lines of the digital video signal;
- a memory delay unit that is configured to receive the quantized words and to output the received quantized words after a time interval that is at least as long as the duration of two sequential pixel clocks;
- and
- a filter that is configured to receive quantized words that are associated with a present video line, to receive delayed quantized words from the memory delay unit, and to filter the received quantized words and the received delayed quantized words such that quantization artifacts in the digital video signal are reduced.
1 more element
A pixel dithering system, comprising:
- means for receiving a digital image signal, wherein the digital image signal comprises lines of pixel data, wherein each pixel comprises at least one word;
- means for reducing the number of bits in words in the digital video signal such that quantized words are formed;
- means for buffering lines of the quantized words;
- means for filtering the digital image signal by providing a feedback path that contemporaneously receives quantized words from the quantizer and quantized words from the memory;
- and
- means for outputting the filtered digital image signal.
3 more elements
Dependencies are inferred from the claim text.