e/Block Truncation Coding

Information
has gloss	eng: 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 Colour Cell Compression . BTC has also been adapted to video compression
lexicalization	eng: Block truncation coding
instance of	e/Lossy compression