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65results about How to "Less storage" patented technology

Adaptive compression and decompression of bandlimited signals

An efficient method for compressing sampled analog signals in real time, without loss, or at a user-specified rate or distortion level, is described. The present invention is particularly effective for compressing and decompressing high-speed, bandlimited analog signals that are not appropriately or effectively compressed by prior art speech, audio, image, and video compression algorithms due to various limitations of such prior art compression solutions. The present invention's preprocessor apparatus measures one or more signal parameters and, under program control, appropriately modifies the preprocessor input signal to create one or more preprocessor output signals that are more effectively compressed by a follow-on compressor. In many instances, the follow-on compressor operates most effectively when its input signal is at baseband. The compressor creates a stream of compressed data tokens and compression control parameters that represent the original sampled input signal using fewer bits. The decompression subsystem uses a decompressor to decompress the stream of compressed data tokens and compression control parameters. After decompression, the decompressor output signal is processed by a post-processor, which reverses the operations of the preprocessor during compression, generating a postprocessed signal that exactly matches (during lossless compression) or approximates (during lossy compression) the original sampled input signal. Parallel processing implementations of both the compression and decompression subsystems are described that can operate at higher sampling rates when compared to the sampling rates of a single compression or decompression subsystem. In addition to providing the benefits of real-time compression and decompression to a new, general class of sampled data users who previously could not obtain benefits from compression, the present invention also enhances the performance of test and measurement equipment (oscilloscopes, signal generators, spectrum analyzers, logic analyzers, etc.), busses and networks carrying sampled data, and data converters (A/D and D/A converters).
Owner:TAHOE RES LTD

Method and device for correcting image barrel distortion and image processing device

The invention provides a method for correcting image barrel distortion. The method comprises the steps of forming a lookup table according to relations of an ideal coordinate of pixels prior to image distortion and a distortion factor, calculating distances R<x> and R<y> of the ideal coordinates (x, y) on an x direction and a y direction relative to an original point, enabling a central point coordinate (xc, yc) (x, y) of an image be set to be the original point, and obtaining the equations that R<x>=xc-x and R<y>=yc-y; calculating a K value, calculating a distortion factor S, and obtaining the ideal coordinate corresponding to a distortion coordinate according to relations between the distortion coordinate and the ideal coordinate; endowing a pixel value of the distortion coordinate to the ideal coordinate, and forming a corrected image according to the ideal coordinate and the pixel value of the distortion coordinate. The invention further provides a device for correcting image barrel distortion and an image processing device. According to the method and device for correcting image barrel distortion and the image processing device, operation quantity can be reduced, barrel correction is achieved rapidly and effectively, a memory which is low in cost can be used, and the cost is reduced.
Owner:深圳市繁维科技有限公司

Method and apparatus for aggressive compression, storage and verification of the dynamics of handwritten signature signals

The fields of biometrics and commerce can benefit from the aggressive compression techniques presented here. A novel approach to compressing the on-line handwriting signal without losing the dynamic information (i.e., velocity and order) is presented which provides the means to fit almost any signature sample within the 57-byte limit of one of the free magnetic strips on the back of conventional transaction cards such as credit or debit cards or other identity cards. The apparatus requires an on-line signature capture tablet capable of sampling the handwritten signature in a series of sampled X and Y coordinates. The compression method starts with segmenting the on-line handwriting signal into portions which may be approximated with a set of features from which the velocity and position may be reconstructed. These features are then compressed further using standard compression techniques. A Huffman coding technique is used to demonstrate this step. The size of the average signature including its dynamic information is stored in a space less than 57 bytes which is the magic limit imposed by conventional, magnetic transaction (credit or debit) card strips. This is by far less than about 1000 bytes required if only loss-less techniques were used. A loss-less compression technique is also briefly presented. Normally, out of the three strips which are provided on the back of a card, two strips are available and may be used for storing the template of the owner's signature for future verification.
Owner:BEIGI HOMAYOON S M
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