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Compressed Mobile Communication Graphics Overview

Learn about extended EMS for mobile communication graphics compression, including data blocks, block references, 4-level greyscale, and 64-colour pictures. Discover how compression can be beneficial for efficient image storage.

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Compressed Mobile Communication Graphics Overview

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  1. Mobile Communication Extented-EMS

  2. Mobile Communication After compression, a composed bytestream is composed of two types of elements: data blocks and block references. A data blockcontains an uncompressed block of octets. On the other hand a block reference is used to identify a sequence of octets in the uncompressed stream in order to repeat the identified sequence simply by referring to it.

  3. 4level greyscale Mobile Communication For black and white pictures, the dimesions of 4-level greyscale bitmap pictures can reach a maximum of 255 X 255 pixels. In uncompressed form, the state of each pixel of the bitmap picture is represented with 2 bits. It is therefore highly recommended to compress greyscale pictures.

  4. 4level greyscale Mobile Communication Octet 1 – 7 of this information Element contain the generic extended object header. Octets 8 – n contain picture specific information

  5. 64-colour picture Mobile Communication As for black and white and greyscale pictures, dimensions of colour bitmap pictures can reach a maximum of 255 x 255 pixels. In uncompressed form, the state of each pixel of the bitmap picture is represented with 6 bits.

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