Investigating Lossy Image Coding Using the PLHaar Transform

Conference · Tue Nov 16 04:00:00 EST 2004

DOI:https://doi.org/10.1109/DCC.2005.45· OSTI ID:15015877

Senecal, J G; Lindstrom, P; Duchaineau, M A; Joy, K I

We developed the Piecewise-Linear Haar (PLHaar) transform, an integer wavelet-like transform. PLHaar does not have dynamic range expansion, i.e. it is an n-bit to n-bit transform. To our knowledge PLHaar is the only reversible n-bit to n-bit transform that is suitable for lossy and lossless coding. We are investigating PLHaar's use in lossy image coding. Preliminary results from thresholding transform coefficients show that PLHaar does not produce objectionable artifacts like prior n-bit to n-bit transforms, such as the transform of Chao et al. (CFH). Also, at lower bitrates PLHaar images have increased contrast. For a given set of CFH and PLHaar coefficients with equal entropy, the PLHaar reconstruction is more appealing, although the PSNR may be lower.

• Research Organization: Lawrence Livermore National Lab., Livermore, CA (US)
• Sponsoring Organization: US Department of Energy (US)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 15015877
• Report Number(s): UCRL-CONF-208087
• Country of Publication: United States
• Language: English

Related Subjects

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COMPRESSION
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