基于纹理分解的变换域JND模型及图像编码方法

doi:10.3969/j.issn.1000-436x.2014.06.024

Abstract

Abstract:

In order to improve the accuracy of the just noticeable difference (JND) model in transform domain, an en-hanced JND model with a new method for contrast masking factor estimation was proposed. The image was decomposed and the textural image was used for an accurate block classification, thus the accurate JND in DCT domain was obtained. The improved JND model was applied on the perceptual image coding. Considering the compatibility and the auxiliary information which would affect the encoding efficiency, the JND model was adjusted to the quantization process and re-moved more visual redundancy. Experimental results show that the proposed algorithm can improve the JND threshold;compared with JPEG standard, the perceptual coding method can save more bit rate and does not need extra bit for auxil-iary information at the similar visual quality. The proposed algorithm is also applicable to the perceptual video coding.

Key words: visual perception, just noticeable difference(JND), textural decomposition, image coding

Ming-kui ZHENG,Kai-xiong SU,Wei-xing WANG,Cheng-dong LAN,Xiu-zhi YANG. Improved sub-band JND model with textural decomposition and its application in perceptual image coding[J]. Journal on Communications, 2014, 35(6): 185-191.

Figures/Tables 11

References 17

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测试图像	PSNR对比/dB		主观质量对比	复杂度对比/s
测试图像	文献[11]模型	本文模型	主观质量对比	文献[11]模型本文模型
Lena	30.638	30.010	0.1	0.828	0.953
Barbara	30.749	30.165	?0.1	0.453	0.531
hedgebw	29.656	29.202	0	0.437	0.531
Lady	31.016	30.555	0.1	0.422	0.547
Camerama	30.136	29.827	0	0.406	0.516
Goldhill	30.668	30.042	?0.1	1.906	2.313
Peppers	31.106	30.551	?0.1	1.891	2.234
Baboon	29.083	28.832	0	1.937	2.485
Boat	30.546	30.175	0	1.859	2.297
Indian	30.301	29.754	0	1.922	2.5
平均	30.390	29.911	?0.01	1.206	1.491
增加值		0.479			0.285

主观评分	描述
?3	右图比左图质量差很多
?2		?1	右图比左图质量只差一点
0	0
1	右图比左图质量只好一点
2	右图比左图质量好
3	右图比左图质量好很多

测试图像	算法码率/(比特·像素^?1)			码率减少量
测试图像	JPEG编码	文献[15]	本文方法	JPEG相比	文献[15]相比
Lena	0.953	0.911	0.823	13.6%	9.7%
Barbara	0.934	0.907	0.804	13.9%	11.4%
hedgebw	1.270	1.245	1.095	13.8%	12.0%
Lady	0.718	0.625	0.620	13.6%	0.8%
Camerama	0.876	0.890	0.751	14.3%	15.6%
Goldhill	0.835	0.781	0.698	16.4%	10.6%
Peppers	0.654	0.556	0.546	16.5%	1.8%
Baboon	1.390	1.507	1.191	14.3%	21.0%
Boat	0.744	0.707	0.637	14.4%	9.9%
Indian	0.944	0.926	0.793	16.0%	14.4%
平均				14.7%	10.7%

	客观质量SSIM对比			主观质量对比
测试图像
测试图像	JPEG编码	文献[15]	本文方法	JPEG编码	文献[15]
Lena	0.922	0.920	0.910	0.1	0.1
Barbara	0.896	0.913	0.891	0.1	0.1
hedgebw	0.924	0.923	0.909	0	0
Lady	0.935	0.925	0.926	0.1	0.2
Camerama	0.911	0.920	0.900	0.2	0.2
Goldhill	0.894	0.892	0.877	0	-0.1
Peppers	0.885	0.874	0.875	0	-0.1
Baboon	0.879	0.902	0.862	?0.1	0
Boat	0.930	0.929	0.920	?0.1	0
Indian	0.890	0.887	0.875	?0.1	0.1
平均	0.907	0.908	0.894	0.02	0.03

		算法复杂度/s
测试图像
测试图像
	JPEG编码	文献[15]	本文方法
Lena	1.719	1.954	2.797
Barbara	1.609	1.828	2.234
hedgebw	2.235	2.469	2.718
Lady	1.203	1.25	1.876
Cameraman	1.484	1.703	2.078
Goldhill	9.47	9.595	11.251
Peppers	6.828	6.265	8.922
Baboon	19.188	22.829	18.845
Boat	7.875	8.376	9.907
Indian	10.782	11.203	12.156
平均	6.239	6.747	7.278
本文增加值	16.7%	7.9%

Improved sub-band JND model with textural decomposition and its application in perceptual image coding

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