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This paper presents a scheme to measure radial and axial position of a magnetically levitated rotor based on hall-effect sensors. Linear hall-effect sensor is selected due to its low cost and miniature size. The proposed sensor system consisted of two hall-sensor modules attached on the stator, and a ring permanent magnet mounted on the rotor. The sensor module is designed via finite-element analysis...
The side-match vector quantization (SMVQ) technique has been widely used in various image compression and hiding techniques. It effectively decreases the bit rates of image with a great compressed quality. However, the prediction is not precise while the variation between the encoded block and its neighboring upper and left blocks is large. Due to the imprecision will cause derailment problem, to...
The visual quality of the extracted watermark is an important criterion when judging the power of watermarking scheme to protect the ownership of an image. The extracted watermark is usually damaged by the rounding operations that come in during the transformation between spatial and frequency domains. A solution for reducing the damage is not to use the rounding operations but rather some other criteria...
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