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Linear array CCD image scanning method

An image scanning and scanning direction technology, applied in the field of line array CCD image scanning, can solve the problems of increasing difficulty and image registration difficulty, defect identification algorithm difficulty, poor versatility, blurred photos, etc., to reduce development efficiency and development costs, technical solutions Simple and practical, to achieve convenient effects

Inactive Publication Date: 2012-10-31
SHENZHEN UNIV
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Problems solved by technology

[0005] The control method based on external synchronous events is realized by hardware, which has high cost and poor versatility. For example, for linear array CCDs produced by different manufacturers and different data transmission protocols, special hardware and control methods must be designed. In addition , the interference of the external system has a great influence on its control effect
[0006] Due to the lack of motion planning, the control method based on internal events only considers the matching relationship between the linear velocity of the linear array CCD and the linear velocity of the measured object under ideal conditions, and ignores the motor in different control modes (S-curve control mode, The acceleration and deceleration process of the T-curve control mode, etc.), which leads to the phenomenon of stretching or compression deformation or even blurred photos in the photos before the camera starts shooting and stops shooting, which increases the acquired photos in the subsequent image processing process. The difficulty of the image registration and the difficulty of the defect recognition algorithm reduce the detection efficiency of the system

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] attached figure 1 It is a flow chart of scanning and motion control planning for the linear array CCD image acquisition system. This method is suitable for scanning and controlling the best scanning image quality of the automatic optical detection system based on the linear array CCD imaging system. The coordinate system transformation between the system and the reference point between them is related, so if any one of the parameters changes, the imaging system must be calibrated and the corresponding control command file will be generated according to the motion planning algorithm and the scanning and control command coding method.

[0026] as attached figure 1 As shown, after the system is initialized, the scanning X and Y axes first return to the absolute zero point and then to the relative zero point. After placing the board, the wor...

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Abstract

The invention provides a linear array CCD (Charge Coupled Device) image scanning method. The image scanning method comprises the following steps: step 1, achieving motion planning and scanning path planning for both the scanning direction and the non-scanning direction of a linear array CCD imaging system; and step 2, encoding scanning and control commands of the linear array CCD imaging system. By adopting the technical scheme provided by the invention, the phenomena that an image is subject to stretching, compression, fuzziness and other distortion and deformation due to acceleration and deceleration of a motor when a tested object starts to move and finishes movement are well avoided.

Description

technical field [0001] The invention relates to a linear array CCD image scanning method, which belongs to the technical field of CCD imaging. Background technique [0002] Linear array CCD is widely used because of its simple structure and low cost. The number of single-row photosensitive units of the linear array CCD can be made a lot. Under the premise of the same measurement accuracy, the measurement range can be made larger, and because the linear array CCD transmits the photoelectric conversion signal in real time and has a fast self-scanning speed and frequency response. High, can realize dynamic measurement, and can work under low illumination, so the linear array CCD is widely used in many fields such as product size measurement and classification, non-contact size measurement, bar code and so on. [0003] In the prior art, the linear array CCD image scanning control technology that achieves the best scanning image quality is divided into two categories: a control ...

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Application Information

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IPC IPC(8): H04N5/232H04N9/04G01B11/00
Inventor 程涛彭小波冯平徐刚胡国煌
Owner SHENZHEN UNIV
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