DOT CHARACTER QUALITY INSPECTION METHOD AND DOT CHARACTER QUALITY INSPECTION SYSTEM

To provide a pattern matching method configured to improve accuracy of determining dot character quality in consideration of deformation of a shape of dots constituting a dot character.SOLUTION: A method includes: a printed dot character selection process for selecting each of dot character images f...

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Bibliographic Details
Main Author TSUNODA KOYO
Format Patent
LanguageEnglish
Japanese
Published 11.04.2024
Subjects
CALCULATING
COMPUTING
COUNTING
IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
PHYSICS
TESTING
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Summary:To provide a pattern matching method configured to improve accuracy of determining dot character quality in consideration of deformation of a shape of dots constituting a dot character.SOLUTION: A method includes: a printed dot character selection process for selecting each of dot character images from a group of captured dot character images captured by imaging means; a dot center calculation process for calculating central coordinates of dot images from dot images constituting the dot character image selected in the dot character selection process and dot images constituting a corresponding standard dot character image; an inspection dot character image generation process for generating an inspection captured dot character image and an inspection standard dot character image on the basis of the central coordinates of the dot images calculated in the dot center calculation process; a matching degree calculation process for calculating a matching degree by matching the inspection captured dot character image generated in the inspection dot character image generation process and the inspection standard dot character image; and a quality determination process for determining quality of the captured dot character images on the basis of the matching degree calculated in the matching degree calculation process.SELECTED DRAWING: Figure 4 【課題】ドット文字を構成するドット形状の変形を考慮したドット文字良否判定精度の高いパターンマッチング法を提供する。【解決手段】方法は、撮像手段が撮像した一群の撮像ドット文字画像から個別のドット文字画像を選択する印字ドット文字選択過程と、ドット文字選択過程で選択されたドット文字画像を構成する各ドット画像及び対応する標準ドット文字画像を構成する各ドット画像から各ドット画像の中心座標を算出するドット中心算出過程と、ドット中心算出過程で算出した各ドット画像の中心座標に基づいて検査用撮像ドット文字画像及び検査用標準ドット文字画像を作成する検査用ドット文字画像作成過程と、検査用ドット文字画像作成過程で作成した検査用撮像ドット文字画像及び検査用標準ドット文字画像を照合して、照合度を算出する照合度算出過程と、照合度算出過程で算出した照合度に基づき撮像ドット文字画像の良否判定を行う良否判定過程からなる。【選択図】図４
Bibliography:Application Number: JP20220157238