Abstract
Compressive Sampling (CS) achieves the sub-Nyquist image acquisition, which bringing about a rapid development of compressive imaging devices. In CS framework, the adaptive sampling scheme is an efficient approach to improving the rate-distortion performance of imaging system. However, the sampling allocation depends on the original sample image, which increases the cost and complexity of imaging system, thereby making CS lose its superiority. In this paper, we propose a saliency-based adaptive CS scheme that allocates more sampling resources to salient regions but fewer to non-salient regions. Its key idea is to extract the saliency information by using the contrast between CS measurements, thus avoiding the original sample image in the imaging system. The scheme is realized in practice without any changes of the architecture of compressive imaging device. To match our adaptive sampling scheme, we also propose a weighted global recovery model based on saliency information. This model can effectively suppress the blocking artifacts while improving the visual qualities of salient regions. Experimental results on natural images show that the proposed adaptive CS scheme improves the visual quality of reconstructed image, and has better rate-distortion performance than the existing adaptive CS schemes.
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Acknowledgements
This work was supported in part by the National Natural Science Foundation of China, under Grants nos. 61501393, 61601396, 61572417 and 61502409, in part by Youth Sustentation Fund of Xinyang Normal University, under Grant no. 2015-QN-043, in part by the Key Scientific Research Project of Colleges and Universities in Henan Province of China, under Grant no. 16A520069.
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Li, R., He, W., Liu, Z. et al. Saliency-based adaptive compressive sampling of images using measurement contrast. Multimed Tools Appl 77, 12139–12156 (2018). https://doi.org/10.1007/s11042-017-4862-z
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DOI: https://doi.org/10.1007/s11042-017-4862-z