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Dot peen mark image acquisition

A marking and image technology, applied in the direction of image communication, induction record carrier, record carrier used by machines, etc., can solve problems such as difficulties

Pending Publication Date: 2018-03-27
HAND HELD PRODS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Codes such as QR codes can be used to permanently mark parts or products, but traditional image acquisition and decoding systems designed to read higher resolution ink-written codes may not be able to correctly read codes generated using dot impact technology. Difficulty in

Method used

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Examples

Experimental program
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Embodiment Construction

[0036] The present invention covers a method and apparatus for point-impact DPM decoding using an autofocus device.

[0037] According to some example embodiments, the image acquisition system is modified to apply an offset to the motor position of the autofocus motor. The distance to the marker is measured, and an offset is applied that makes the points merge and become more machine-readable.

[0038] refer to figure 1 , a barcode reader can be viewed as having two main components: a decoder 10 for decoding barcodes and QR codes (such as 14) within captured images; and an image acquisition system 20 for The image sent to the decoder 10 is captured. In an example of such a system, the image is captured through a lens 24 whose focus is adjusted by an autofocus motor.

[0039] When using current technology to decode dot impingement DPM markings, the decoder is specially adapted to reliably decode dotted images compared to more traditional markings. Such decoders are commonly...

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PUM

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Abstract

The invention relates to dot peen mark image acquisition. A mark reader apparatus has a lens and an autofocus system that manipulates the lens in accordance with control signals. An image acquisitionsystem measures a distance from the lens to a dot peened mark. A processor is programmed to: calculate a focus position for the autofocus system that focuses the lens on the dot peened mark; apply anoffset to the calculated focus position to produce an offset focus position; control the autofocus system by positioning the autofocus system to the offset focus position; and via the image acquisition system, acquire an image of the mark with the autofocus system set to the offset focus position.

Description

technical field [0001] The present invention relates to image acquisition and decoding of dot impingement marks such as in direct part marking (DPM). Although the invention was developed for dot impact markers, the invention may have, without limitation, other applications to similar markers consisting of arrays of dots. Background technique [0002] Direct Part Marking (DPM) technology is used to provide a machine-readable code that is a permanent marking of the material of a part or assembly. This can be achieved, for example, by point impacting the markers. In point impact marking, a stiff needle (such as a carbide or diamond-tipped assembly) is struck against the surface of the part to form a pattern of points that create a permanent mark. A dot impact marking machine may use an electromechanically driven or pneumatic marking needle to stamp (or impact) a series of dots to form a desired mark that may represent, for example, a barcode or quick response (QR) code, text,...

Claims

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Application Information

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IPC IPC(8): G06K7/14H04N5/232
CPCG06K7/1417G06K7/146H04N23/67G02B7/282G06K19/06159G06K7/10811G06K7/1439G06K19/06121
Inventor J-H.德斯弗奈J.埃斯彭德V.贝塞特
Owner HAND HELD PRODS
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