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Region-based image compression

A region, image technology, applied in the field of region-based image compression, can solve the problem of not providing a good level of image quality

Active Publication Date: 2014-07-23
ADVANCED MICRO DEVICES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing methods generally do not provide a good level of image quality, and in some cases can also introduce potentially unwanted image artifacts (e.g., high-frequency noise)

Method used

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  • Region-based image compression
  • Region-based image compression
  • Region-based image compression

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Embodiment Construction

[0022] Fixed-rate block-based compression techniques require methods to efficiently encode images at low bit rates without significantly sacrificing image quality. Adding local per-region transform and quantization steps before any subsequent encoding and / or compression steps reduces the amount of data to be encoded and / or compressed to maintain image quality while achieving the desired target bit rate. To decompress a region, the compressed data may first be fully or partially decompressed according to the underlying compression scheme (depending on the implementation). A reconstruction transform is then applied to produce an approximation of the original uncompressed data. If any coefficients are discarded during quantization, those coefficients are assumed to be zero for reconstruction transform purposes.

[0023] figure 1 is a block diagram of an exemplary apparatus 100 in which one or more disclosed embodiments may be implemented. Device 100 may include, for example, a...

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Abstract

A method for compressing an image includes decomposing the image into one or more regions. A region of the image is selected to be evaluated. The selected region is transformed and quantized if the region does not meet a predetermined compression acceptability criteria. The predetermined compression acceptability criteria may include a specific bit rate, a specific image quality, or combinations thereof. If the region does not meet the predetermined compression acceptability criteria after the region has been transformed and quantized, then the transformation and quantization settings are adjusted and the region is transformed and quantized using the adjusted settings. The region is then encoded when the predetermined compression acceptability criteria has been reached. The encoding may include additional compression stages.

Description

[0001] Related Application Cross Reference [0002] This application claims the benefit of U.S. Provisional Application No. 61 / 547,648, filed October 14, 2011, and U.S. Nonprovisional Application No. 13 / 651,020, filed October 12, 2012, the contents of which are hereby incorporated by reference incorporated herein as if fully set forth herein. technical field [0003] The present invention relates generally to image compression, and in particular to a method for region-based image compression. Background of the invention [0004] Lossy compression techniques require methods to efficiently encode images at lower bit rates without significantly sacrificing image quality. Fixed rate compression schemes generally have poor image quality at rates significantly lower than four bits per pixel. Some existing variable rate compression techniques such as Joint Photographic Experts Group (JPEG) apply some form of transform and quantization. [0005] Some methods of reducing the amoun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/17H04N19/12H04N19/119H04N19/124H04N19/154H04N19/122H04N19/117
CPCH04N19/119H04N19/46H04N19/196H04N19/122H04N19/96H04N19/12H04N19/146H04N19/154H04N19/17H04N19/194H04N19/10H04N19/124H04N19/587H04N19/167G06T9/00G06T3/4084H04N19/60
Inventor 安德鲁·S·波米亚诺夫斯基康斯坦丁·尤里查
Owner ADVANCED MICRO DEVICES INC