Scanning system and method for controlling aiming light source

Abstract

The present application provides a scanning system and method for controlling an aiming light source, which is characterized in that it includes an image sensor, and sequentially exposes a pixel array through a rolling shutter to collect a target image, the pixel array includes effective pixels and non-imaging pixels, and the effective Pixels are pixels actually used for image decoding, and the non-imaging pixels are pixels not actually used for image decoding; the aiming light source is used to project an aiming pattern to aim at the target; a control unit is used to control the image sensor and the aiming light source , so that the aiming light source is in an off state during the exposure time of the effective pixels, and the aiming light source is in an on state during at least part of the exposure time of the non-imaging pixels.

Description

technical field [0001] The present application relates to a scanning system and method for controlling an aiming light source. Background technique: [0002] 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 (Charge Coupled Device) and some cmos (complementary metal oxide semiconductor) are global exposure, and some cmos are rolling shutter exposure, and rolling shutter exposure cmos has a price relative to global exposure ccd and cmos The advantage is that it has less noise and ...

AI Technical Summary

Problems solved by technology

[0003] 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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