Some experiments in compressing angiocardiographic images according to the Peano-Hilbert scan path.
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. We achieved best compression results applying the PABCEL method, obtaining a mean compression ratio of about 8:1. Consulted cardiologists did not find significant diagnostic differences between original images and reconstructed ones.
Dipartimento di Bioingegneria, Politecnico di Milano, Italy.
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Pinciroli
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Combi
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Pozzi
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Portoni
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Negretto
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Invernizzi
D000465:Algorithms; D000790:Angiocardiography; D015906:Angioplasty, Balloon, Coronary; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D010781:Photography; D011856:Radiographic Image Enhancement / Q000379:methods; D012984:Software; D014743:Videotape Recording