3,684 research outputs found

    Burrows Wheeler Compression Algorithm (BWCA) in Lossless Image Compression

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    The present paper discusses the implementation of BWCA in lossless image compression. BWCA uses Burrows Wheeler Transform (BWT) as its main transform. As one of combinatorial compression algorithm which in particular reordered symbols according to their following context, it becomes one of promising approach in context modeling compression. BWT was initially created for text compression, and here we study the impact of BWCA method and its improvement when applied to image compression. Since this application is quite different from the original method aim, we analyze the pre- and post-processing influences of BWT

    Exposure-Tolerant Imaging Solution forCultural Heritage Monitoring

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    This paper describes a simple and cheap solution specifically designed for monitoring the degradation of thin coatings employed for metal protection. The proposed solution employs a commercial photocamera and a frequency-domain-based approach that is capable of highlighting the surface uniformity changes due to initial corrosion. Even though the proposed solution is specifically designed to monitor the long-time performance of protective coatings employed for the restoration of silver artifacts, it can be successfully used also for assessing the conservation state of other ancient metallic works of art. The proposed solution is made tolerant to exposure changes by using a procedure for sensor nonlinearity identification and correction, does not require a precise lighting control, and employs only free open-source software, so that its overall cost is very low and can be used also by not specifically trained operator
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