Automatic focusing method and system of scanning code device

An automatic focusing and automatic adjustment technology, applied in electromagnetic radiation induction, instruments, induction recording carriers, etc., can solve the problems of increased complexity, increased cost, fixed position of the distance sensor, etc., and achieves the effect of high efficiency and rapid adjustment of focus.

Active Publication Date: 2018-09-07
HANGZHOU SYNOCHIP DATA SECURITY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can realize the function of autofocus, it has the following disadvantages: 1. The overall cost of the system is increased; 2. The overall complexity of the system is increased; 3. The p

Method used

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  • Automatic focusing method and system of scanning code device
  • Automatic focusing method and system of scanning code device
  • Automatic focusing method and system of scanning code device

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0039] Example one:

[0040] Such as figure 1 As shown, the automatic focusing method of the code scanning device in this embodiment includes the following steps:

[0041] Set the running speed value v of the conveyor belt, and notify the automatic focusing system in time when the running speed value v of the conveyor belt changes; adjust the lens of the scanning device to the default focal length L to collect images;

[0042] Acquire images at a fixed time interval t, determine the measured object on the conveyor belt in the image, and calibrate the characteristic position of each measured object;

[0043] The offset pixel value S of the measured object is obtained according to the deviation of the characteristic position of the measured object within the fixed time interval t; preferably, the characteristic position of the measured object is the label position on the surface of the measured object, and the label position is compared It is conspicuous and easy to identify; for exampl...

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Abstract

The invention belongs to the focal length adjustment technical field and relates to an automatic focusing method of a scanning code device. The method includes the following steps that: the running speed value of a conveyor belt is preset, and the focal length of the lens of the scanning code device is adjusted to be a default focal length; images are acquired according to a fixed time interval, measured objects on the conveyor belt in the images are judged, and the characteristic position of each measured object is calibrated; the deviation pixel values of the measured objects are obtained according to the deviation of the characteristic positions of the measured objects in the fixed time interval; vertical distances between the measured objects and the lens are calculated; and the focallength of the lens is automatically adjusted according to the vertical distances between the measured objects and the lens. The present invention also provides an automatic focusing system corresponding to the automatic focusing method. According to the automatic focusing method of the invention, a distance measuring device such as a distance sensor is not required to be additionally adopted, thedistances between the measured objects and the scanning lens can be quickly determined, and the focal length of the lens can be quickly adjusted.

Description

technical field [0001] The invention belongs to the technical field of focus adjustment, and in particular relates to an automatic focus method and system for a code scanning device. Background technique [0002] Barcodes are widely used in product manufacturing process, and the emerging two-dimensional code can store more information, so its application in product manufacturing process is more in-depth. For example, in automobile manufacturing, DPM two-dimensional codes, that is, direct parts marking two-dimensional codes, can be used to mark auto parts with needle marking machines, laser marking machines, inkjet printers and even chemical etching technology. Has been widely used in the automotive industry. The American Automobile Manufacturers Association (AIAG) has also specially formulated relevant standards, from the steel body, steel cover, crankshaft, connecting rod, camshaft of the engine to the valve body, valve seat, valve cover of the gearbox, and then to the key...

Claims

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Application Information

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IPC IPC(8): G06K7/10
CPCG06K7/10435
Inventor 苗欣胡荣贵夏舒畅
Owner HANGZHOU SYNOCHIP DATA SECURITY TECH CO LTD
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