Introduction to Digital Image Processing

UNITARY TRANSFORM CODING OF MONOCHROME IMAGES 643

1. The first sample along each row in a block is coded regardless of its magni-

tude. A position code word of all zeros or all ones affixed to the amplitude pro-

vides a row synchronization code group;

2. The amplitude of the second run-length code word is the coded amplitude of

the next significant sample. The position code is the binary count of the num-

ber of samples of the significant sample from the previous significant sample;

3. If a significant sample is not encountered after scanning the maximum run

length of samples, the position and amplitude code bits are set to a unique code

word to in