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Feature extraction is at the core of satellite scene classification task. In this paper, we propose a fast binary coding (FBC) method to effectively generate the global discriminative feature representation of image scenes. Equipped with unsupervised feature learning technique, we first learn a set of optimal “filters” from large quantities of randomly sampled image patches, and then we obtain feature...
A novel watermarking sharing scheme for gray-level images is proposed, which has the ability of sharing secret (the gray-level image) with multi-users. Multiple-based number system is used to split the secret into n meaningless shares, each share is embedded into cover image with controlled distortion and to be assigned to each user afterwards. The main feature of the proposed scheme is sharing a...
In this paper, a novel watermarking scheme based on relationship of Tchebichef moments is proposed. Firstly, the image is divided into blocks; then the Tchebichef momentpsilas relationship of each block is computed, which is computed rapidly with the help of the look-up-table; finally, the Tchebichef moments of each block are modified to embed watermark. The watermark extraction is the reverse procedure...
In this paper we introduce a watermarking arithmetic for certificate identifying. The arithmetic is based on the FMT transformation. We insert special information in the digital photograph of the certificate and study on it after printing and scanning. The relationship of printing resolution, scanning resolution and the image is discussed, which effects the scheme's efficiency. The experiments show...
A new image content authentication algorithm based on Laplace spectra was proposed. Outstanding feature points are extracted from the original image and a cipher point is inserted. A relational graph is then built, and the Laplace spectra of the graph are calculated to serve as image features. The Laplace spectra are quantized then embedded into the original image as a watermark. In the authentication...
Barcode has been widely applied in the modern world. This paper presents a fast and robust recognition method of noisy code 39 barcode. The proposed method can be divided into two steps: search and decoding. In the first step, all asterisks in the image are found with evenly defined scan lines and then those with the same directions are matched together to get a valid barcode region. In the second...
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