强背景光的高频目标物频谱分析及信息提取研究

ABSTRACTABSTRACTAlong with the development of reach,reachers have found that the 3Dinformation of the welding pool is better to indicate the condition of the welding,3DShape Measurement of the welding pool is concerned much more.Although 3DShape Measurement of the welding pool is significant,the hotness,brightness andspecular surface of the welding pool make the 3D Shape Measurement very difficult.And the corresponding reach and develop is little,in addition,the existing system ofthe Measurement of the welding pool is too sophisticate and expensive to be appliedfar and wide.Therefore,it is significant to build a 3D Shape Measurement of weldpool which is made up of ordinary and un-expensive components.Phase 3D sensing is appropriate to measure the dynamic surface due to itsno-touching when Phase 3D sensing is used.When the grating is casted on the weldpool surface,measure mistake will happen because of the high background light.Howto restrain the arc plasma become the key.Compared with arc plasma,the grating ishigh-spatial-frequency distribution,and it can be acquired by spatial-filtering.Theresearch on spatial spectrum analysis and information extraction of thehigh-spatial-frequency object with the strong background light is essential to 3Dsensing of welding pool.The difference of the arc and the grating stripe in the spectrum coordinates andthe frequency coordinates is respectively analyzed.The filtering system is reached.Associated with filtering system,the system of the 3D Shape informationMeasurement of the welding pool is primarily built.The legible images of the weldingpool are captured.The gray distributing of the images of the welding pool is analyzed.The imageprocessing is made on these images and the edge is abstracted.The influence to the 3-D Shape information Measurement of the welding poolof the join of the filtering system is primarily discussed:the join the spatial filteringsystem makes the optical axis of the camera system is vertical to the reference plane,makes the upper data processing simpler,create the advantage for the 3-D Shapeinformation Measurement of the welding pool.Keywords:spatial filtering;vision sensing of welding pool;digital image processingⅢ