KEYWORDS: Education and training, Data modeling, Video, Performance modeling, Feature extraction, Video acceleration, Process modeling, Detection and tracking algorithms, Convolution, Contamination
During object tracking process, if only the first frame is used as the matching template, changes about the target state will often lead to poor tracking results or even tracking failure of the classic Siamese tracker. To deal with this issue, UpdateNet uses the first frame as template, and regularly updates the template with combination of the previous accumulated template and the current predicted template. However, the combining of template tends to bring in background information which may pollute the template representation. For the purpose of obtaining accurate template and timely sensing the change of target, this article introduces the Squeeze-and-Excitation channel attention and selective mechanism to UpdateNet. The channel attention mechanism can sort the template information spliced by channels by adjusting the weight to highlight important information. The confidence score of the tracking predicted result of the Siamese network is used to determine whether the corresponding frame should participate in template accumulation, and a threshold is set to exclude severely contaminated predicted templates. The article also uses a more detailed parameter adjustment method to enable UpdateNet to achieve convergence faster and be more adaptive. We apply the improved UpdateNet into the DaSiamRPN tracker, and evaluations on the VOT2016 and VOT2018 datasets show that our methods can effectively improve the performance of UpdateNet.
KEYWORDS: Data conversion, 3D applications, Point clouds, Matrices, Manufacturing, Mathematical optimization, Distortion, Design and modelling, 3D modeling, Systems engineering
In the process of converting the free-form surface of the blade of the centrifugal compressor impeller to the ruled surface, the cutter rotation method is a rotating search with the search center as the center of the circle and the radius is sequentially changed. The search in the meridian and circumferential directions of the blade is not completely independent, resulting in a certain range Search blind spots. We propose a new search method. The search of the cutter in the blade meridian direction and the tangential direction are independent of each other, which further expands the search range of the best position of the flank milling ruled surface cutter. The mathematical calculation method of this method is introduced, and two different free-form surface centrifugal compressor impellers are used as test examples. The results show that this method can improve the accuracy of transforming the free-form surface of the impeller blade into a ruled surface.
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