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Saliency enabled compression in JPEG framework
Published in Institution of Engineering and Technology
Volume: 12
Issue: 7
Pages: 1142 - 1149
Under low bit-rate requirements, JPEG baseline causes compression artifacts in the image. Through this paper, a novel region-of-interest (ROI) dependent quantization method in JPEG framework is proposed. The proposed method judiciously quantizes DCT coefficients belonging to salient and non-salient regions of the image. In this work, multiple ROIs are optimally identified and ranked by using variances. The number of classes is adaptively calculated using goodness-ofsegmentation. After the number of classes and their ranks are obtained, the image is divided into blocks of size 8 × 8. These blocks may belong to more than one class and hence these are ranked based on their membership in various classes. 2D-DCT coefficients of each block are obtained and then quantized adaptively based on their ranks. Overhead for rank information of blocks is minimized by applying delta-encoding. Results are analyzed in terms of objective quality parameters and visual perception and found that the blocking artifacts in the proposed method are significantly lower than JPEG. The efficiency of the proposed method is demonstrated by results of recently published similar methods and the former is found superior in terms of quality of the reconstructed image. © The Institution of Engineering and Technology 2018.
About the journal
JournalIET Image Processing
PublisherInstitution of Engineering and Technology
Open AccessNo