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Vector quantisation (VQ) shows a good performance for image coding with high-compression ratios. However, there are many difficulties for image coding with VQ, especially the edge degradation and high-computational complexity. To resolve these two problems, the authors propose a new coding method based on edge orientation patterns (EOPs) by classifying image blocks into nine classes according to their...
This paper proposes a method to encrypt an image in two shares with following properties. (1) The method is suitable for binary, gray level or color image encryption. (2) The bit error rates are adjustable, and thus the secret image can be recovered to different extents including lossless and nearly lossless. (3) Sizes of the share images are flexible to be changed, and thus the method can be used...
This paper proposes a visual secret sharing scheme for color image encryption with robust and progressive decryption abilities. Robust decryption means the secret content can be still decrypted from shares even the shares are corrupted with intentional or unintentional alterations. In progressive decryption, three levels quality of secret images can be decrypted with the same shares. A lower visual...
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