Image collection control method and system

Abstract

The invention discloses an image collection control method, and the method comprises the steps: S1, setting the PID control parameters of a servo system, wherein the integration constant Ki is zero; S2, setting a target position Po where the servo system collects an image; S3, controlling the servo system to move to the target position Po according to the PID control parameters and the target position Po, and then obtaining the actual position Pa of the servo system and a sampling image obtained at the actual position Pa; S4, obtaining a positioning error Ea according to the target position Po and actual position Pa of the servo system, wherein Ea=Pa-Po; S5, compensating for the sampling image according to the positioning error Ea. The invention also discloses an image collection control system. According to the invention, through setting the PID control parameters and setting the integration constant as zero, the method and system reduce the dependence of image collection on the PID parameter optimization. The target position and actual position of the servo system are obtained so as to obtain the positioning error. A positioning error compensation method is used for obtaining the sampling image with the zero positioning error. The method and system can achieve the quick positioning, and are high in positioning precision.

Description

technical field [0001] The invention relates to the field of image acquisition, in particular to an image acquisition control method and system thereof. Background technique [0002] In a high-precision image capture system, when the servo system is positioned above the workpiece (object), it usually produces overshoot oscillation or a "steady-state error" for a long period of time, so that the positioning time is long and the positioning is deviated. At present, the usual way to solve this problem is: optimize the PID adjustment parameters and add an integral constant to try to eliminate the system steady-state error, and finally wait for the actual position to be delayed, and then start image acquisition after the system enters the "allowable error zone" of the target position. refer to figure 1 , figure 1 It is the flow chart of the control method of the existing image acquisition. If you need to increase the positioning accuracy, you must adjust the PID parameters very...

AI Technical Summary

Problems solved by technology

This is very difficult to implement (for example, only one PID parameter can hardly ensure that it is optimal), and it will inevitably increase the positioning time, resulting in a decrease in the speed of fixed-point acquisition; and it is still impossible to solve the "positioning steady state deviation" Impact

In the existing image acquisition control system, the positioning depends too much on the adjustment parameters, the positioning time is too long (obviously, the relationship between speed and accuracy is not necessary), and the possible steady-state error cannot be eliminated! In addition, when the servo system locates above a workpiece and acquires images for high-precision position information processing, if the positioning process takes too long, the efficiency of the entire detection process will inevitably be low; and if the positioning itself has errors, it will It leads to deviation in data processing, which directly affects the measurement accuracy of the entire equipment

Images