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3408 results about "Wavelet transform" patented technology

In mathematics, a wavelet series is a representation of a square-integrable (real- or complex-valued) function by a certain orthonormal series generated by a wavelet. This article provides a formal, mathematical definition of an orthonormal wavelet and of the integral wavelet transform.

Image encoding using reordering and blocking of wavelet coefficients combined with adaptive encoding

An encoder reorders quantized wavelet coefficients to cluster large and small wavelet coefficients into separate groups without requiring the use of data-dependent data structures. The coefficients are then adaptively encoded based on a run-length code which continuously modifies a parameter that controls the codewords uses to represent strings of quantized coefficients, seeking to minimize the number of bits spent in the codewords. A matrix of indices contains the coarsest coefficients in the upper left corner, and filling in low high and high low sub bands in larger and larger blocks in an alternating manner, such that low high sub bands comprise the top of the matrix and the high low sub bands comprise the left side of the matrix. The shortest codewords are assigned to represent a run of the most likely character having length of 2k, where k is a parameter. k is adjusted based on successive characters being encountered. k is increased when the character is the same, and decreased when the character is different. A decoder applies the above in reverse order. Decoding of the encoded coefficients is first performed, followed by an unshuffling of the coefficients. The unshuffled coefficients are then subjected to an inverse wavelet transform to recover the transformed and compressed data, such as image pixels.
Owner:DYNADEX DATA LLC

JPEG2000 self-adapted rate control system and method based on pre-allocated code rate

InactiveCN101106711AAccurate code rate pre-allocationPre-allocated precisionTelevision systemsDigital video signal modificationCoding blockControl system
The invention discloses a JPEG2000 self-adapting rate control system and a method based on pre-assignment of code rate, mainly solving the problem of large calculation amount and large memory size of JPEG2000 encoding method. The code block of the original image after pretreatment, wavelet transformation and quantification is output by two lines, one line directly enters the bit plane and MQ coder; for the other line, the entropy of each code block is estimated by the entropy estimate module, sent to the code rate assignment module to assign code rate, and the code rate of each code block is feed back to the bit plane and MQ coder through the encoding depth control module, after the code blocks are encoded by the bit plane, further feed back to the encoding depth control module to determine the output code stream of each encoded code block, and the output code stream is under optimal interception and code stream organization to output the ultimate code stream. At the same time, the invention can change the threshold value of the encoding depth control coefficient as required, to flexibly control the encoding depth in order to improve the image compression quality. The invention has the advantages of low complexity and easiness for hardware implementation, and is suitable for various JPEG2000 image real-time compression systems.
Owner:SHANDONG HUAYU AEROSPACE TECH CO LTD

Multiple-template matching identity recognition method based on ECG (Electrocardiogram) under electrocardiogram abnormality state

The invention relates to a multiple-template matching identity recognition method based on an ECG (Electrocardiogram) under an electrocardiogram abnormality state, and belongs to the technical field of biological characteristic identity recognition. The ECG data of a user to be recognized is compared with the data of a registered user in a template library to obtain an identity recognition result. The key technology of the method comprises the following steps: carrying out electrocardiosignal preprocessing for eliminating noise interference; carrying out electrocardiosignal decomposition to separate an electrocardiogram waveform of each period; carrying out standardized processing for independently achieving standardization on time and amplitude scales; carrying out characteristic extraction: in the step, characteristics are extracted by wavelet transform, and clustering analysis is carried out by an ISODATA (Iterative Self-organizing Data Analysis Techniques Algorithm) so as to construct an ECC template library; and carrying out correlation analysis: in the step, correlation between ECG test data and each template is calculated, an optimal matching template is selected, and finally, an identity recognition result is obtained. The multiple-template matching identity recognition method provided by the invention utilizes the intrinsic electrocardiosignal of a human body to recognize an identity, and the ECG data under the abnormality state is considered.
Owner:SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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