41 results about "Motion History Images" patented technology

The invention discloses a view-independent human action identification method based on template matching, which can identify a plurality of pre-defined typical actions in a video. When constructing a template, a motion history image under a plurality of projection viewpoints are calculated for each sample action and polar coordinate characteristics are extracted, the polar coordinate characteristics are mapped to a low-dimensional sub-space by adopting a manifold learning method, and super balls are constituted for the sample actions in the sub-space on the basis of the low-dimensional coordinate of the multi-viewpoint polar coordinate characteristics. An action template is composed of a plurality of super balls with known ball centers and radiuses. When an unidentified action is given, the motion history image and the corresponding polar coordinate characteristics of the action are firstly calculated, then the polar coordinate characteristics are projected into the template action sub-space to obtain the low-dimensional coordinate, the distances from the coordinate to all the ball surfaces of the super balls are calculated, and the nearest super ball is selected as the identification result. The technology provided by the invention realizes the view-independent action identification and has higher application value in the video monitoring field.

The invention discloses a behavior recognition method based on a motion history image and a convolutional neural network, comprising the following steps: S1, acquiring an input original video image, and processing it through a behavior sequence feature extraction method based on a motion history image; S2 1. Using a method based on a deep convolutional neural network to conduct behavior recognition on local motion history images to obtain a behavior category classifier, and finally output the behavior recognition result through the behavior category classifier. The present invention calculates motion history images from original video sequences, which not only reduces the amount of information to be processed, but also extracts key spatio-temporal information in behavior recognition; then uses motion history images as input to build a deep convolutional neural network, and then uses Stochastic gradient descent (SGD) and Dropout strategy train the network, and finally realize the classification of behavior categories. The invention can be effectively applied to online real-time behavior recognition.