Backhaul difference eliminating method and device

Abstract

The embodiment of the invention relates to the technical field of monitoring, in particular to a return stroke difference eliminating method and device, and the return stroke difference eliminating method and device are applied to an electric lens and mainly used for eliminating the return stroke difference of a focusing motor installed on the electric lens. The backhaul difference eliminating method comprises the steps of determining target positions of a focusing motor in a plurality of search intervals according to a predetermined rule, wherein an image corresponding to the target positionsis the clearest. And after the search is finished, controlling the focusing motor to move by a first preset distance in the direction opposite to the search from the search finishing position, and after the focusing motor moves by the preset distance, controlling the focusing motor to move by a second preset distance in the direction close to the target position so as to reach the target position. According to the scheme, firstly, the focusing motor determines the target position with the clearest image through searching, and then the focusing motor is controlled to turn back to the target position from the searching end position for two times, so that the return stroke difference is overcome, and the clear image is obtained.

Description

technical field [0001] The present invention relates to the technical field of monitoring, in particular to a method and device for eliminating backhaul difference. Background technique [0002] With the development of the monitoring field, the market of simple motorized lenses is also opened, and the application occasions are increasing day by day. At the same time, the focus effect of this lens has also attracted much attention. Due to the low cost of the simple electric lens and the simple structure and process, there is a gap between the gear and the gear of the electric lens. When the motor turns, due to the existence of the gap, it must The position of the motor does not change within the range of the step size, and the step size is the return stroke difference of the motor. We call a simple motorized lens with a large return distance difference a trigger lens, and a fatal factor affecting the focusing effect of this lens is the return distance difference. The image ...

AI Technical Summary

Problems solved by technology

The image acquisition by the lens generally includes two processes, which are search and turning back to the target position after the search. Due to the existence of the backhaul difference, even if the lens finds the clearest image position during the search process, it cannot find the image again by turning. The clearest position, so that the acquired image may be blurred

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