Abstract
During the last decade, there has been an increasing interest in the design of very fast wavelet image encoders focused on specific applications like interactive real-time image and video systems, running on power-constrained devices such as digital cameras, mobile phones where coding delay and/or available computing resources (working memory and power processing) are critical for proper operation. In order to reduce complexity, most of these fast wavelet image encoders are non-(SNR)-embedded and as a consequence, precise rate control is not supported. In this work, we propose some simple rate control algorithms for these kind of encoders and we analyze their impact to determine if, despite their inclusion, the global encoder is still competitive with respect to popular embedded encoders like SPIHT and JPEG2000. In this study we focus on the non-embedded LTW encoder, showing that the increase in complexity due to the rate control algorithm inclusion, maintains LTW competitive with respect to SPIHT and JPEG2000 in terms of R/D performance, coding delay and memory consumption.
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This work was funded by Spanish Ministry of education and Science under grant DPI2007-66796-C03-03.
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López Granado, O.M., Martínez-Rach, M.O., Piñol Peral, P. et al. Rate Control Algorithms for Non-Embedded Wavelet-Based Image Coding. J Sign Process Syst 68, 203–216 (2012). https://doi.org/10.1007/s11265-011-0598-6
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DOI: https://doi.org/10.1007/s11265-011-0598-6