Digital image processing, Computer science

Variable length code
Bit plane coding

1. NADAR SARASWATHI COLLEGE OF ARTS AND SCIENCE DIGITAL IMAGE PROCESSING M.Vidhya II M.Sc Computer Science

2. variable-length code A code in which a fixed number of source symbols are encoded into a variable number of output symbols. This variable number(the code length) may be made to depend on some property of the source symbols input to the encoder, often their relative frequency of occurrence. If a variable-length code is to be instantaneously decodable it must obey krafts inequality. VARIABLE-LENGTH CODE

3. Variable length coding method is used to minimize the coding redundancy. Variable-length coding reduces only coding redundancy by assigning the shorstest possible code words to the most probable levels. The most popular variable length coding is”Huffman coding method”.

4. Bit plane coding is a technique that reduces image inter-pixel redundancy by processing each bit plane of an image individually . First decompose the original image into bit-plane. Binary image compression approach run-length coding(RLC). BIT PLANE CODING

5. In lossless predictive coding a new pixxel value is obtained by finding the difference between the predicted pixel value and the current pixel. In other words, this is the new information of a pixel is defined as the difference between the actual and predicted value of that pixel. LOSSLESS PREDICTIVE CODING

6. The approach commonly referred to as lossless predictive coding, is based on eliminating the inter pixel redundancies of closely spaced pixels by extracting and coding only the new information in each pixel.

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