Advances in Visual Data Compression and Communication

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4.4 Improvements to the PFGS Framework 75

• LQPi—Low-quality predicted image that is generated by motion compensation

from the lower quality reference

• LQPd—Difference between LQPi and the original image

• LQPD—DCT coefficients of LQPd

• LQBR—DCT residues that are produced by subtracting the already encoded

(quantized and then de-quantized) DCT coefficients in the base layer from LQPD

coefficients

• LQPR—DCT residues that are produced by subtracting the already encoded

DCT coefficients in the previous layers from the LQPD coefficients

• HQPi—A high-quality predicted image that is generated by motion compensa-

tion from the higher quality reference

• HQPd—Differences between HQPi and the original image

• HQPD—DCT coefficients of HQPd

• HQPR—DCT residues ...