Audio fingerprint technology has been increasingly played an important role in audio content identification, audio information security, industrial process monitoring, etc. Due to compressed format has become the main way for audio files storage and transmission, it owns more practical significance that directly extracting audio fingerprint from compressed-domain. In general, existing compressed-domain audio fingerprint schemes are robust to common time-frequency-domain distortion, including noise, echo, band-pass filtering, 32Kbps@MP3 and others. But they are difficult to deal with large linear speed change distortion which is a frequent audio processing means in the field of television and broadcast. This paper proposes a novel compressed-domain audio recognition algorithm, which can resist linear speed change in the range of-10% to 10% (recognition rate is higher than 90%), via extracting fingerprint after do Fourier-Mellin transform for sub-band energy sequence of MDCT spectrum. This is enough to cope with almost all situations of audio acceleration/deceleration occurred in commercial application. In addition, it shows similarity in other performance compared with existing excellent compressed-domain audio recognition algorithms.
Leather is a common processing material with poor rigidity in shoe manufacturing, there is easy to generate tensile or compress deformation, so reducing the processing quality. Considering the reasons of leather processing deformation, there are flexible material variety, different material thickness and complicated processing path. The article discussing the various impact factors of leather cutting deformation, combined with the theory and method of processing decision knowledge acquisition, processing knowledge management, and closed-loop compensation control, to propose a deformation compensation method of leather cutting based on knowledge management. Thought the real-time processing path compensation control, to correcting the tool trajectory in process, improving the accuracy and reliability of leather cutting.
In FWP processing, since the workpiece deformation parameters change with movement and the lag of processing compensation, ETPEM method is taken during the process. This article will establish FWP (flexible workpiece trajectory) processing performance indicators matter-element and TS-FNN model network matter-element to achieve the TS-FNN model network structure goodness evaluation method indirectly on the basis of deep study of ETEPM relevant theories.
Projection-camera interaction is a human-computer interaction technology which uses projector-camera as input-output devices, and combined with human movement as interactive mode. Introducting radial distortion and tangential distortion of lens to projection-geometric calibrate the camera system, the platform is used the Xilinx main processor Virtex-4 FX experimental box to building a projection-camera interactive implementation platform, and used the Baum-Welch algorithm which based on hidden Markov model for training gesture.
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