The Research And Implementation Of Related Technology Based On FPGA Line Structure Optical Center Line Extraction

With the improvement of the level of industrial manufacturing,the shape and internal structure of industrial components have become increasingly complex.Many parts have uneven patterns on the surface or grooves with different shapes inside,which places higher requirements on the measurement and inspection technology of parts.Three-dimensional measurement technology can provide threedimensional data information of parts and components,which can meet the measurement requirements of complex parts and components,which is of great significance for improving production efficiency and improving product quality.The structured light measurement method based on the principle of laser triangulation is a typical non-contact visual measurement technology,which can provide real and reliable three-dimensional data information without causing damage to parts.It has fast measurement speed,high accuracy and large measurement range.Etc.Therefore,it is widely used in three-dimensional measurement and inspection.This paper researches and sets up a 3D measurement system model of line structured light,and mainly studies the key processing links of light strip image acquisition,image preprocessing,light strip center line extraction and data transmission in the system.Among them,the extraction of the center line of the line-structured light strip is the core link in the three-dimensional measurement system,with a large amount of calculation and high hardware performance requirements.In order to ensure the real-time nature of the 3D measurement system,the design and development of the ZYNQ7 platform based on ARM + FPGA architecture are completed in this article.The abundant logic resources(FPGA)on the chip are used to complete the image acquisition,preprocessing,light strip centerline extraction,and data transmission.The main contents of this article are as follows:(1)The internal structure,working method and data output format of industrial CMOS image sensor chip Python300 are studied,and the raw data of light strip image is collected based on FPGA.(2)In order to improve the image quality,first detect and correct the defective pixels caused by the bad unit in the image sensor,and then use the two-point correction method to correct the column fixed pattern noise introduced between the various data paths in the image sensor,and then according to The characteristics of noise in the light stripe image are average filtered on the light stripe image by column to obtain a relatively smooth light stripe image.(3)According to the characteristics of the image sensor multi-channel parallel transmission by row,before the centerline extraction,the image data transmission method needs to be adjusted to column transmission,and then the gray-scale center of gravity method based on FPGA is used to complete the centerline of the light stripe in parallel After extracting and integrating multiple data channels into one,control VDMA to realize data multi-frame combined transmission.Finally,based on the line structured light 3D measurement system model,an experimental platform is set up for system debugging,and the collection,preprocessing of light bar images and the extraction of line structured light centerlines are completed.The experimental results show that the hardware design of the light strip center extraction has fast processing speed,high precision and good stability,and can meet the actual needs of industrial three-dimensional measurement.