4 results about "Normalized correlation" patented technology

This invention discloses a machine vision-based method for detecting blockages in coal preparation plant screening tanks, belonging to the field of industrial automation detection technology. The method includes: acquiring continuous video frames; the user defining an irregular polygonal monitoring area and generating a mask; dividing the video frames into equally spaced blocks; performing normalized correlation template matching on each block within the monitoring area using adjacent frames, recording the positional deviation; marking blocks with deviations close to 0 in multiple consecutive frames as continuously stationary blocks; and determining blockage and triggering an alarm when the number of stationary blocks is greater than a threshold. This invention improves robustness to changes in illumination by utilizing normalized correlation matching, effectively filters out instantaneous misjudgments through continuous frame stationary detection and an accumulator mechanism, and solves the problem of water flow interference by combining edge detection preprocessing, thus achieving automatic and accurate detection of blockages in coal preparation plant screening tanks and ensuring production safety.

This invention relates to the field of motor control technology and discloses an optimal dynamic response deadbeat current prediction system for permanent magnet synchronous motors. The system performs the following steps: acquiring motor operating status data and historical sequence data; calculating the error phase trajectory and detecting periodic disturbance patterns through cross-mechanical cycle normalized correlation analysis; extracting historical feedforward compensation voltage vectors and calculating the net available voltage amplitude under the periodic disturbance pattern; calculating the upper limit of the current change rate based on the net available voltage amplitude and planning the optimal intermediate current trajectory; performing two-step deadbeat current prediction calculations to calculate the nominal voltage vector; synthesizing the voltage vector and performing constraint verification; outputting voltage commands and updating the angle index memory table.

The application relates to an improved template matching-based target tracking algorithm implementation method, which solves the problems of time consumption, instability, surrounding similar target interference and the like of a traditional template matching algorithm by improving a template creation strategy, reading original image data to create a template, and the like; when searching for each frame, a scale factor is introduced to match with a current scale image and a predicted scale image, a region block with an equal size to the template is taken out from each pixel point in a search range as a center to carry out normalized correlation operation with the template, a target point position in the current scale and the predicted next scale image is obtained, a latest scale factor is obtained by judging a confidence degree, and the problem of tracking drift of the traditional template matching algorithm is solved; the application improves the applicability of the traditional template matching algorithm, considers tracking speed and precision, has small and fixed algorithm calculation amount, has low requirement on an embedded platform, and has a good application prospect.

This invention provides a method, apparatus, device, and medium for data link signal synchronization and rate identification, relating to the field of communications. The method includes: acquiring a complex baseband signal of a data link signal; generating first and second complex signal templates corresponding to first and second frame lengths, each containing a carrier with a synchronization tone frequency and a phase transition at the boundary of each frame; performing sliding correlation processing on the complex baseband signal and the first and second complex signal templates respectively, and normalizing the correlation results to obtain first and second normalized correlation curves; performing peak search on the first and second normalized correlation curves respectively, and performing cross-curve matching to determine burst synchronization points; comparing the peak scores of the two normalized correlation curves at the burst synchronization points to determine the burst rate pattern. This invention enables robust burst detection, automatic rate pattern identification, and frame synchronization of data link signals under low signal-to-noise ratio, frequency offset, and interference environments.