FPGA-based high-speed visual positioning system

Abstract

The invention provides an FPGA-based high-speed visual positioning system. The FPGA-based high-speed visual positioning system comprises an upper computer, a linear CCD camera and an FPGA control board card; the FPGA control board card is provided with an upper computer interface and a linear CCD camera interface and is further provided with an image acquisition signal generator, an image processing module and a position calculation unit; the image processing module synthesizes a plane image according to sampling frequency; and the position calculation unit calculates the current position of paper and transmits the current position to the upper computer through the upper computer interface. The FPGA-based high-speed visual positioning system performs image acquisition by the linear CCD camera and performs intelligent image processing, and can adapt to more quantity and types of paper, thereby improving the diversity of printing products and the adaptability of the positioning system.

Description

technical field [0001] The invention belongs to the technical field of digital jet printing equipment, and in particular relates to an FPGA-based high-speed visual positioning system. Background technique [0002] In recent years, with the rapid development of digital printing technology, the printing speed is getting faster and faster. Correspondingly, the requirements for the paper positioning system, whether it is speed or precision, are getting higher and higher. [0003] The traditional positioning system uses the combination of photoelectric eye / digital eye and pressure wheel / coaxial encoder. The position of the paper or color block is collected by the electric eye, and then counted by the encoder, and then positioned to the printing position for printing. The following are the disadvantages of traditional positioning systems: [0004] 1. When positioning the starting position of the paper, it is required that the color difference between the paper and the conveying ...

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Problems solved by technology

[0006] 3. For the pressure roller encoder, the installation requirements for the pressure roller are relatively strict. If the pressure roller jumps or slips, the impact on the positioning system is fatal;

[0007] 4. Because the coaxial encoder is installed inside the machine, the working conditions are harsh, it is easily affected by oil pollution, and the life of the coupling is low. At the same time, the coaxial installation method has a low resolution for speed acquisition, resulting in a decrease in accuracy;

[0008] 5. The traditional positioning system can only collect the position of the paper in the direction of the paper, but cannot collect and correct the position perpendicular to the direction of the paper and the angle of the paper

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