Scanning system and method for controlling aiming light source

Abstract

The invention provides a scanning system and method for controlling an aiming light source, an image sensor of a camera sequentially exposes pixel rows of a pixel array through a rolling shutter to convert a target image into an electric signal, and the pixel array comprises effective pixels and non-imaging pixels; an aiming light source is used for projecting an aiming pattern aiming target; a control unit is used for controlling the camera and the aiming light source, defining that the control unit starts the aiming light source only in partial frames in multiple frames of images continuously acquired by the camera as a first mode, and defining that the control unit controls the aiming light source to be in a closed state within the exposure time of the effective pixel as a second mode; when the exposure time of the pixel rows of the pixel array is larger than a threshold value, the control unit starts a first mode, and when the exposure time of the pixel rows of the pixel array is lower than the threshold value, the control unit starts a second mode.

Description

[0001] This divisional application is a divisional application of a Chinese patent application with an application date of July 16, 2020, an application number of 202010684085.5, and an invention title of "Scanning System and Method for Controlling Aiming Light Source". technical field [0002] The present application relates to a scanning system and method for controlling an aiming light source. Background technique: [0003] Existing image readers are divided into two exposure methods: global exposure and rolling shutter exposure. Global exposure usually refers to the simultaneous exposure of all pixels, while rolling shutter exposure refers to the sequential exposure of the pixel array. The global exposure method can avoid the jelly effect. For High-speed moving objects can also produce clear images, but rolling shutter exposure cannot produce clear images for moving objects due to the pixel exposure time difference, and it will produce a jelly effect. Generally, ccd (Cha...

AI Technical Summary

Problems solved by technology

[0004] In the field of optical image reading, it is usually necessary to aim at the light source to project an aiming pattern to indicate the reading range of the image reader. Since the brightness of the aiming pattern is higher than the brightness of the surrounding environment, it often causes partial overexposure of the image and affects the reading efficiency.

The image reader with global exposure, because the exposure of all pixels is synchronized, can use the blanking technology to stagger the turn-on time of the aiming light source and the exposure time of all pixels, so that no aiming pattern will appear in the collected image, and local overexposure can be avoided ; Rolling shutter exposure because the pixels are exposed sequentially, the exposure time of the pixels is not synchronized, and the same blanking technology as the global exposure cannot be used

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