Patent
Precomputing and encoding compressed image enhancement instructions
TLDR
In this article, the authors proposed a method for restoring images that have been distorted due to lossy image compression, which can comply with many compression standards, adds nothing to the compressed images' bandwidth, and distorts the image by only a very tiny amount.Abstract:
Traditional techniques such as filtering and edge enhancement have been applied to restoring images that have been distorted due to lossy image compression. However, these techniques have ignored a unique feature that can be exploited when working with digital compression. Before the image is stored or transmitted, the sender has access to both the original and the distorted images, enabling the encoder to transmit information specifying the regions where the enhancement was successful. To utilize this feature, before storage or transmission the sender produces a codec file, and assesses the efficacy of one or more enhancement schemes. To determine which image regions have been improved by the enhancement, the enhanced codec is compared to the original. A map of where the enhancement scheme was successful is encoded into the image by making tiny adjustments to the image itself. This method can comply with many compression standards, adds nothing to the compressed images' bandwidth, and distorts the image by only a very tiny amount. Examples are presented showing the reduction of distortion if enhancement is used, together with calculations of how much distortion is introduced if a standard decompressor is used.read more
Citations
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Book
Multimedia Data Hiding
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Efficient and lossless conversion for transmission or storage of data
N. Caleb Avery,Ralph Tobelmann +1 more
TL;DR: In this article, a system and method for lossless data compression using a mathematical transform equivalent to the content value of the data, and taking fewer bits to represent, is presented.
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System and method for authentication of JPEG image data
TL;DR: In this article, a unique hashing function is derived from a first section of image data contained in the JPEG compressed image in such a way that any changes subsequently made to the first image data is reflected in a different hashing function being derived from signature string is embedded into a next section of the image data.
References
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