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In this paper, we have presented a high-payload, reversible data hiding scheme that is focused on embedding secret data into joint photographic experts group (JPEG) bitstream by using histogram modification. In JPEG, for AC coefficients, 162 different variable length codes (VLCs) are defined and assigned by Huffman coding for all 162run/sizepossibilities. After parsing VLC usage in the bitstream, we generated a histogram ofrun/size. According to a peak point and the nearest zero point of the histogram, the secret data were embedded by modifying the corresponding VLC values slightly. The experimental results and comparing the performance of our scheme with those of other existing schemes demonstrated that the proposed scheme preserved the quality of the image with no distortion and achieved the goal of high embedding capacity. [ABSTRACT FROM AUTHOR]

A low bit rate information hiding scheme is important for efficient communication. According to our observation, in a search order coding based (SOC based) hiding method, the case distribution generated from different images and from different secret strings is different. Based on this characteristic, we designed a dynamic selective, SOC based, information hiding scheme to achieve a desirable compression effect. That is, depending on different case distributions, we used different coding modes to reduce the bit rate more effectively. The main concept of our design is to let the two cases that occur most frequently use one-bit indicators and to let the remaining two cases use four-bit indicators to indicate the following coding types. The experimental results showed that the proposed scheme has a lower bit rate than other SOC based information hiding schemes. As a result, the proposed information hiding scheme is more practical for real world applications. [ABSTRACT FROM AUTHOR]

Measurement of camouflage performance is of fundamental importance for military stealth applications. The goal of camouflage assessment algorithms is to automatically assess the effectiveness of camouflage in agreement with human detection responses. We propose a new method for computational evaluation of camouflage effectiveness. We evaluate the performance of the new method and other existing algorithms in a comparative setting which utilised an extensive human visual experiment. The results show that the new method is correlated with the human target searching results with higher correlations than the existing algorithms. [ABSTRACT FROM AUTHOR]

This paper presents a novel image retargeting approach for ranging cameras. The proposed approach first extracts three feature maps: depth map, saliency map and gradient map. Then, the depth map and the saliency map are used to separate the main contents and the background and thus compute a map of saliency objects. After that, the proposed approach constructs an importance map which combines the four feature maps by the weighted sum. Finally, the proposed approach constructs the target image using the seam carving method based on the importance map. Unlike previous approaches, the proposed approach preserves the salient object well and maintains the gradients and visual effects in the background. Moreover, it protects the salient object from being destroyed by the seam carving algorithm. The experimental results show that the proposed approach performs well in terms of the resized quality. [ABSTRACT FROM AUTHOR]

In this paper, a secure image delivery scheme that can protect the privacy of secret region in the transmitted image is proposed. The secret region that requires protection is firstly analogised as the repairing and cloning region in the problems of image inpainting and editing. By inpainting and modified Poisson editing, the original protection region can effectively be concealed or disguised with other meaningful content. In the modified Poisson editing process, the twice Laplacian operator is used to improve the seamless transition on the boundary of protection region. The bits generated by the original content of the region are then reversibly embedded into the inpainted or disguised image to form the final protected image. The protected image can be delivered in channels securely, and the attacker cannot obtain the real content of the image without the keys. Experiments were conducted to show the effectiveness and security of the scheme. [ABSTRACT FROM AUTHOR]