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- Block_Truncation_Coding abstract "Block Truncation Coding, or BTC, is a type of lossy image compression technique for greyscale images. It divides the original images into blocks and then uses a quantiser to reduce the number of grey levels in each block whilst maintaining the same mean and standard deviation. It is an early predecessor of the popular hardware DXTC technique, although BTC compression method was first adapted to colour long before DXTC using a very similar approach called Color Cell Compression. BTC has also been adapted to video compression BTC was first proposed by Robert Mitshell at Purdue University. Another variation of BTC is Absolute Moment Block Truncation Coding or AMBTC, in which instead of using the standard deviation the first absolute moment is preserved along with the mean. AMBTC is computationally simpler than BTC. AMBTC was proposed by Maximo Lema and Robert Mitchell.Using sub-blocks of 4x4 pixels gives a compression ratio of 4:1 assuming 8-bit integer values are used during transmission or storage. Larger blocks allow greater compression ("a" and "b" values spread over more pixels) however quality also reduces with the increase in block size due to the nature of the algorithm.The BTC algorithm was used for compressing Mars Pathfinder's rover images.".
- Block_Truncation_Coding wikiPageID "4115418".
- Block_Truncation_Coding wikiPageRevisionID "567097612".
- Block_Truncation_Coding hasPhotoCollection Block_Truncation_Coding.
- Block_Truncation_Coding subject Category:Image_compression.
- Block_Truncation_Coding subject Category:Lossy_compression_algorithms.
- Block_Truncation_Coding type Abstraction100002137.
- Block_Truncation_Coding type Act100030358.
- Block_Truncation_Coding type Activity100407535.
- Block_Truncation_Coding type Algorithm105847438.
- Block_Truncation_Coding type Event100029378.
- Block_Truncation_Coding type LossyCompressionAlgorithms.
- Block_Truncation_Coding type Procedure101023820.
- Block_Truncation_Coding type PsychologicalFeature100023100.
- Block_Truncation_Coding type Rule105846932.
- Block_Truncation_Coding type YagoPermanentlyLocatedEntity.
- Block_Truncation_Coding comment "Block Truncation Coding, or BTC, is a type of lossy image compression technique for greyscale images. It divides the original images into blocks and then uses a quantiser to reduce the number of grey levels in each block whilst maintaining the same mean and standard deviation. It is an early predecessor of the popular hardware DXTC technique, although BTC compression method was first adapted to colour long before DXTC using a very similar approach called Color Cell Compression.".
- Block_Truncation_Coding label "Block Truncation Coding".
- Block_Truncation_Coding label "方块编码".
- Block_Truncation_Coding sameAs m.0bjxg_.
- Block_Truncation_Coding sameAs Q4927178.
- Block_Truncation_Coding sameAs Q4927178.
- Block_Truncation_Coding sameAs Block_Truncation_Coding.
- Block_Truncation_Coding wasDerivedFrom Block_Truncation_Coding?oldid=567097612.
- Block_Truncation_Coding isPrimaryTopicOf Block_Truncation_Coding.