Least squares based optimal switched predictors for lossless compression of images
Citations
18 citations
Cites methods from "Least squares based optimal switche..."
...The LSbased approach was used to find optimal predictors for pixels in GAP [9]....
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8 citations
Cites methods from "Least squares based optimal switche..."
...This optimization technique has been adopted by many authors in lossless image or video compression as in [16] [10]....
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7 citations
7 citations
Cites background or methods from "Least squares based optimal switche..."
...However, predictor structure of [13] consists of only causal pixels whereas proposed predictor structure consists of both causal and non-causal pixels and is described as below: We first find gradients at the unknown pixel (A(n)) in horizontal direction (DH) and in vertical direction (DV ) and then find relative variation as, S = DH − DV (7) where DV = |D(n−4)−B(n−1)|+ |B(n−1)−D(n+2)|+ |D(n−2)−D(n+4)| and DH = |D(n−4)−C(n−3)|+ |C(n−3)−D(n−2)|+ |D(n+2)−D(n+4)|....
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...For finding prediction coefficients (a), we propose to adopt method given in [13]....
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...By doing so, we are doing equal treatment to pixels belonging to various bins [13]....
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6 citations
References
1,668 citations
"Least squares based optimal switche..." refers background or methods in this paper
...State-of-the-art lossless image compression algorithms, based on predictive coding method, include CALIC [4] and JPEG-LS [5] and these methods use switched predictors for prediction....
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...Since our work is around GAP frame work, a brief summary of the working principal of GAP is mentioned below, while the same for MED can be found in [5]....
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...[5] M.J. Weinberger, G. Seroussi, and G. Sapiro, “The LOCO-I Lossless Image Compression Algorithm: Principles and Standardization into JPEG-LS,” HPL-98-193, Nov. 1998....
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...As a consequence, there are several lossless compression methods available in the present literature [1]-[5]....
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1,099 citations
"Least squares based optimal switche..." refers methods in this paper
...State-of-the-art lossless image compression algorithms, based on predictive coding method, include CALIC [4] and JPEG-LS [5] and these methods use switched predictors for prediction....
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...Since inception of CALIC, many of the researchers used a better, but computationally demanding, prediction scheme to produce better compression ratio than that is achieved by CALIC....
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...This approach of prediction is computationally efficient and CALIC improves the prediction accuracy further by using a feedback mechanism called bias - cancellation technique....
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...In this paper, we focus on the Gradient Adjusted Predictor (GAP) used in CALIC and propose to improve its prediction capability (accuracy), with only a small increase in the computational complexity....
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259 citations
"Least squares based optimal switche..." refers background or result in this paper
...The predictor estimation cost is much lower than that of EDP [2] and RALP [3]....
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...This is in contrast with the present practice of doing so by finding predictors using characteristics of the local pixels [2]-[3]....
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34 citations
"Least squares based optimal switche..." refers background or result in this paper
...For T = 6 and k = 25 (about 35% in [3]) and standard image of size 512×512 involves more than 50 milioins of pixels for the estimation of the covariance matrix....
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...The predictor estimation cost is much lower than that of EDP [2] and RALP [3]....
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...This is in contrast with the present practice of doing so by finding predictors using characteristics of the local pixels [2]-[3]....
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5 citations
"Least squares based optimal switche..." refers methods in this paper
...GAP [1] classifies pixels in seven classes and it uses a set of seven switched predictors for the prediction....
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...GAP uses a set of seven switched adaptive predictors [1] and the basic prediction approach using these predictors can be described as given below....
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...As a consequence, there are several lossless compression methods available in the present literature [1]-[5]....
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