Zhao Qian 'an's research direction

1, digital photogrammetry technology and method

Including multi-source image registration and stereo image automatic matching, gray image building contour extraction. Study the mathematical description model of city or building geometry. In the aspect of high spatial resolution image, this paper studies the extraction and recognition of the brightness, contrast, texture, shape and position of geological targets, as well as the wavelet operator and application method of geological target extraction.

2. Differential interferometric radar

Include primary and secondary image registration, radar image coherence, phase unwrapping, etc. And the application of D-InSAR technology.

Currently engaged in the teaching and research of photogrammetry and remote sensing. The research direction is wavelet multi-scale operator for image target extraction. Based on directional wavelet, multi-scale and multi-dimensional directional feature vectors are established, and remote sensing images are segmented by self-organizing neural network. Image texture segmentation and target extraction algorithm based on hidden Markov model. Application of photogrammetry in multi-scale real-time quasi-real-time multi-image matching, multi-sensor fusion and three-dimensional invariant datum establishment in building structure detection. In this paper, the algorithm of combining laser three-dimensional scanning with digital photogrammetry is studied, which is oriented to the perception, active extraction and automatic three-dimensional reconstruction of complex structures of large ancient buildings.