Design Of Positioning And Identification System For Digital Printing Of Warp Knitted Shoes

As the textile industry and cross each other more and more various disciplines,electronic technology cooperation between industry and inkjet printing industry for the development of the maturity,promoted the sustainable development of the inkjet technology.Digital inkjet printing technology was becoming more and more popular with textile enterprises,which can be applied to various textile materials for the printing of complex patterns.Digital inkjet printing promotes the application of Knit warp uppers fabrics because of that it widely used in various products..Digital inkjet printing on warp-knit are generally positioned by conventional manual template or mechanical projection.This method is time-consuming and artificially subjective,and it is prone to problems such as positioning errors,resulting in low product yields and long production cycles.Machine vision technology was widely used in visual robots,textile positioning detection,assembly line identification,and product identification in other industries.This positioning and identification system was built on the digital inkjet printer to achieve accurate edge recognition of the pattern outline of the warp knit fabric and sloved the problem of error in graphic alignment of shoe print and actual platform printing in typesetting of printing software.The visual positioning and identification system consists of two parts,experimental design and actual system construction design.The FPGA device is the core of experimental program in this paper.The positioning and recognition system of warp-knit uppers is designed.The COMS camera collected warp contour information shoes in a high-speed,obtained information such as the size and edge contour of the shoe pattern image by processing,captured the corresponding shoe pattern through the VGA port to display the image on the computer screen in real-time to achieve the positioning effect.The experimental program designed the visual acquisition system’s various hardware circuit modules,the main part included image acquisition circuit,FPGA configuration power supply circuit,SDRAM hardware connection circuit,SPI Flash hardware connection circuit,VGA interface circuit and so on.The verilog HDLhardware description language was used for program verification,including SDRAM read/write control and VGA display,camera register configuration,I2 C communication,data acquisition.Designed corresponding image preprocessing algorithms,,positioning identification algorithm and follow-up correction algorithm on FPGA soft core platform.The feasibility of the implementation of the entire scheme was verified by the collected image data,and the detailed design of the actual scheme was derived.Through the design of the actual program positioning and recognition algorithm,the positioning accuracy of the pattern printed on the warp uppers is further improved,and the secondary development software for correcting errors is the core of the actual scheme.It directly determines that the typesetting software pattern is printed on the warp-knit uppers.The alignment accuracy and print quality.