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A close relationship between the sign information of discrete cosine transform (DCT) coefficients and the phase term of discrete Fourier transform coefficient is explained. From this relationship, the DCT sign-only correlation is proposed and its relationship with the phase-only correlation (POC) is considered. As a result, the proposed correlation can be(More)
OBJECTIVES We investigated the clinical usefulness of soluble dietary fiber (SDF) for the treatment of diarrhea during enteral nutrition in elderly patients. METHODS This study included 10 men and 10 women (mean age +/- standard deviation: 79.3 +/- 5.1 y) who had diarrhea during long-term nutrition management. When administering SDF, the initial dose was(More)
We propose a new technique of non-iterative super-resolution image reconstruction. A closed form solution to reconstruction is derived in the discrete cosine transform (DCT) domain from a MAP-based cost functional. An average image is used in order to avoid iterative operations. Symmetric convolution with appropriate types of DCT suppresses boundary(More)
We propose a method of image registration between scrambled images in order to guarantee the secure data management. This method uses either phase-only correlation or DCT sign phase correlation for the registration. Correlation and registration values between images are directly estimated in the scrambled domain. Information in each image is protected and(More)
We present a theoretical analysis of one-time key based phase scrambling for image matching using phase-only correlation (POC). Phase scrambling is used for visual information protection of templates. The effect of scrambling on POC values is analyzed. As a result, the peak value, which is used as a measure of signal congruence, of the POC between(More)
We propose a scrambling method for image matching using phase-only correlation (POC) or discrete cosine transform sign phase correlation (DCT-SPC). The proposed scrambling method distorts only the phase, which has significant information of images. The information in each image is protected by the distorted phase information. In addition, synchronized(More)
We propose a phase-scrambling method for blind image matching, which is a direct image matching between invisible images. The phase scrambling is motivated by visual protection of images and prevention of illegal image matching. Phase-only correlation (POC) can be directly applied to images protected by the proposed phase scrambling in order to estimate(More)
We propose two fitting functions for shift estimation using discrete cosine transform sign phase correlation (DCT-SPC) with non-integer accuracy. The DCT-SPC can be used in order to estimate the shift values and the similarity between two signals. However, the estimated shift values are limited to integer numbers. The proposed fitting functions enable the(More)
We propose an image matching method using one-time key based phase scrambling. The phase scrambling is used for protection of the original information of templates visually in order to secure privacy. In the proposed method, a key is used to scramble an image once, but the key is not required in the image matching. An appropriately determined key allows(More)