{"0ed9cbeb964eafd1c03a7a15e7023033thomasrichter":{"DOI":"10.1109/DCC.2010.14","ISBN":"978-1-4244-6425-8","ISSN":"1068-0314","URL":"http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5453436","abstract":"The JPEG XR image compression standard, originally developed under the name\nHD-Photo by Microsoft, offers the feature of spatial variably quantization;\nits codestream syntax allows to select one out of a limited set of possible\nquantizers per macro block and per frequency band. In this paper, an\nalgorithm is presented that finds the rate-distortion optimal set of quantizers,\nand the optimal quantizer choice for each macro block. Even though it\nseems plausible that this feature may provide a huge improvement for images\nwhose statistics is non-stationary, e.g. compound images, it is demonstrated that\nthe PSNR improvement is not larger than 0.3dB for a two-step heuristics\nof feasible complexity, but improvements of up to 0.8dB for\ncompound images are possible by a much more complex optimization strategy.","annote":"","author":[{"family":"Richter","given":"Thomas"}],"citation-label":"richter2010spatial","collection-editor":[],"collection-title":"","container-author":[],"container-title":"Data Compression Conference (DCC), 2010","documents":[],"edition":"","editor":[],"event-date":{"date-parts":[["2010","mar"]],"literal":"2010"},"event-place":"Snowbird, UT","id":"0ed9cbeb964eafd1c03a7a15e7023033thomasrichter","interhash":"f8ff101d1065b16a8b19dce9bdb0c1b3","intrahash":"0ed9cbeb964eafd1c03a7a15e7023033","issue":"","issued":{"date-parts":[["2010","mar"]],"literal":"2010"},"keyword":"Annealing, Distortion JPEG Quantization, Rate Simulated Theory, Variable XR, coding, compression, data distortion image optimisation, quantisation rate theory, vector","misc":{"issn":"1068-0314","isbn":"978-1-4244-6425-8","doi":"10.1109/DCC.2010.14"},"note":"","number":"","number-of-pages":"9","page":"79-88","page-first":"79","publisher":"IEEE","publisher-place":"Snowbird, UT","status":"","title":"Spatial Constant Quantization in JPEG XR is Nearly Optimal","type":"paper-conference","username":"thomasrichter","version":"","volume":""},"0ed9cbeb964eafd1c03a7a15e7023033rainerreichel":{"DOI":"10.1109/DCC.2010.14","ISBN":"978-1-4244-6425-8","ISSN":"1068-0314","URL":"http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5453436","abstract":"The JPEG XR image compression standard, originally developed under the name\r\nHD-Photo by Microsoft, offers the feature of spatial variably quantization;\r\nits codestream syntax allows to select one out of a limited set of possible\r\nquantizers per macro block and per frequency band. In this paper, an\r\nalgorithm is presented that finds the rate-distortion optimal set of quantizers,\r\nand the optimal quantizer choice for each macro block. Even though it\r\nseems plausible that this feature may provide a huge improvement for images\r\nwhose statistics is non-stationary, e.g. compound images, it is demonstrated that\r\nthe PSNR improvement is not larger than 0.3dB for a two-step heuristics\r\nof feasible complexity, but improvements of up to 0.8dB for\r\ncompound images are possible by a much more complex optimization strategy.","annote":"","author":[{"family":"Richter","given":"Thomas"}],"citation-label":"Richter2010","collection-editor":[],"collection-title":"","container-author":[],"container-title":"Data Compression Conference (DCC), 2010","documents":[],"edition":"","editor":[],"event-date":{"date-parts":[["2010","mar"]],"literal":"2010"},"event-place":"Snowbird, UT","id":"0ed9cbeb964eafd1c03a7a15e7023033rainerreichel","interhash":"f8ff101d1065b16a8b19dce9bdb0c1b3","intrahash":"0ed9cbeb964eafd1c03a7a15e7023033","issue":"","issued":{"date-parts":[["2010","mar"]],"literal":"2010"},"keyword":"Annealing, Distortion JPEG Quantization, Rate Simulated Theory, Variable XR, coding, compression, data distortion image optimisation, quantisation rate theory, vector","misc":{"issn":"1068-0314","isbn":"978-1-4244-6425-8","doi":"10.1109/DCC.2010.14"},"note":"","number":"","number-of-pages":"9","page":"79-88","page-first":"79","publisher":"IEEE","publisher-place":"Snowbird, UT","status":"","title":"Spatial Constant Quantization in JPEG XR is Nearly Optimal","type":"paper-conference","username":"rainerreichel","version":"","volume":""}}