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What does PABEL stand for?

PABEL stands for pseudo-gradient adaptive brightness error limitation

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We defined, implemented and experimented on angiocardiographic static images three new irreversible compression techniques: Brightness Error Limitation (BEL), Pseudo-gradient Adaptive Brightness Error Limitation (PABEL), Pseudo-gradient Adaptive Brightness and Contrast Error Limitation (PABCEL). We applied these techniques to some 168 static images selected from 35mm angiocardiographic films. Considering threshold values limited to maintain all significant clinical informations, we achieved best compression results applying PABCEL method: we obtained a mean compression ratio of about 8:1.
We defined and implemented three new irreversible compression techniques for digital angiocardiographic static images: brightness error limitation (BEL), pseudo-gradient adaptive brightness error limitation (PABEL), pseudo-gradient adaptive brightness and contrast error limitation (PABCEL). To scan digital images we implemented an algorithm based on the Peano-Hilbert plane filling curve. We applied our compression techniques to 168 static images selected from angiocardiographic 35-mm films.