JP4933771B2 - 画像システムにおいてビデオツールを自動的にリカバリーするシステムおよび方法 - Google Patents
画像システムにおいてビデオツールを自動的にリカバリーするシステムおよび方法 Download PDFInfo
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Description
第1のステップ(a)では、検査対象のワーク特徴との関係でビデオツールが適切に動作していないことを検出すると、特徴の画像の解析に基づいて、少なくとも特徴の周囲の領域において、1または複数の画像特性値が決定される。画像特性値は、画像の輝度,画像の焦点のような画像の特性または特質を示す値であればどのようなものでもよい。
第2のステップ(b)では、決定された各画像特性値について、当該値が許容範囲(大抵は、予め決まっている範囲,デフォルト範囲,1または複数の特徴検査パラメータによって決まる範囲などである)内に入っているか否かが判断される。特性値に応じて、画像が暗過ぎる,明る過ぎる,焦点がずれているなどと、画像についての判断を下すことができる。
第3のステップ(c)では、画像特性値が許容範囲内に入るように、画像検査システムにおける適当な特徴検査パラメータが調整される。少なくとも、画像の平均輝度が許容範囲外である場合には、画像の照明状態に影響を与える各種のハードウェア/ソフトウェアパラメータが調整される。
Claims (7)
- ワーク検査用の画像検査システムにおいて、特徴検査パラメータに基づいて動作するビデオツールを利用してワーク特徴画像の取得および当該ワーク特徴画像におけるワーク特徴の検査を行う際に、前記特徴検査パラメータの最初のセットに基づいて前記ビデオツールが適切に動作しない場合に、適切に動作しないビデオツールを自動的にリカバリーする方法であって、
前記方法は、
(a)前記ビデオツールの不適切な動作を検出すると、少なくとも1つの特徴検査パラメータに関する画像特性値を前記ワーク特徴画像の解析に基づいて評価するステップと、
(b)評価された画像特性値について、当該画像特性値が当該画像特性値についての所定の許容範囲内に入っているか否かを判定するステップと、
(c)前記ステップ(b)において前記画像特性値が前記許容範囲外であると判定された場合には、前記特徴検査パラメータの前記最初のセットの前記画像特性値に関する少なくとも1つの画像取得パラメータを調整して、当該画像特性が前記所定の許容範囲内に入るようにし、前記ビデオツールを適切に動作させるような特徴検査パラメータの取替えセットを提供するステップと
を備え、
前記画像特性値に関する少なくとも1つの画像取得パラメータを調整するステップは、少なくとも1つの照明パラメータを調整して、輝度特性が当該輝度特性についての所定の許容範囲内に入るようにするステップを含む
ことを特徴とする方法。 - 請求項1に記載の方法において、
前記ステップ(c)に含まれる、前記少なくとも1つの画像取得パラメータを調整するステップは、
前記少なくとも1つの照明パラメータを調整して、輝度特性が当該輝度特性についての所定の許容範囲内に入るようにするステップを第1のステップとし、
前記第1のステップに続いて、少なくとも1つの焦点パラメータを調整して、焦点特性が当該焦点特性についての所定の許容範囲内に入るようにする第2のステップ
を含むことを特徴とする方法。 - 請求項1に記載の方法において、
前記ステップ(c)において、前記少なくとも1つの画像取得パラメータを調整するステップの後に行われる、特徴検査パラメータの前記最初のセットの少なくとも1つの要素を自動的に調整する前記ステップは、
(d)少なくとも1つの調整された前記画像取得パラメータにより前記最初のセットにおける対応する要素を取り替えることによって、特徴検査パラメータの試験セットを形成するステップと、
(e)前記試験セットに基づいて、ワーク特徴画像を取得し、前記ビデオツールによる当該画像におけるワーク特徴の検査動作を行うステップと、
(f)前記ビデオツールが適切に動作した場合には、前記試験セットを前記取替えセットとして使用するステップと
を含むことを特徴とする方法。 - 請求項3に記載の方法において、
前記ステップ(f)の実行中に前記ビデオツールが適切に動作した場合には、
パートプログラムの実行中に、前記最初のセットを前記取替えセットに自動的に取り替えるステップ,
前記画像検査システムの訓練モード中に、前記最初のセットを前記取替えセットに自動的に取り替えるステップ,
前記ステップ(f)における前記ビデオツールの適切な動作中に得られた検査結果を、パートプログラムにおける当該ビデオツール動作についての検査結果として自動的に使用し、当該パートプログラムにおける次の動作を自動的に続けるステップ
の少なくとも1つのステップが実行される
ことを特徴とする方法。 - 請求項4に記載の方法において、
前記ビデオツールがエッジツールであり、当該ビデオツールが前記ステップ(f)において適切に動作しなかった場合、特徴検査パラメータの前記最初のセットの少なくとも1つの要素を自動的に調整するステップは、
(g)前記ステップ(e)において前記ビデオツールがエッジを囲んでいなかったか否かを判定するステップと、
(h)前記ステップ(e)において前記ビデオツールがエッジを囲んでいなかった場合には、当該エッジの位置を当該ビデオツールの直近に設定し、当該ビデオツールが当該直近のエッジを囲むように、前記試験セットに含まれるツール位置パラメータを調整するステップと、
(i)前記ステップ(e)および(f)を繰り返し行うステップと
を含むことを特徴とする方法。 - 請求項5に記載の方法において、
前記ビデオツールがエッジツールであり、当該ビデオツールが前記ステップ(i)において適切に動作しなかった場合、特徴検査パラメータの前記最初のセットの少なくとも1つの要素を自動的に調整するステップは、
(j)前記試験セットにおけるエッジ強度閾値パラメータを小さくするステップと、
(k)前記ステップ(e)および(f)を繰り返し行うステップと
を含むことを特徴とする方法。 - 請求項6に記載の方法において、
輝度パラメータ,焦点パラメータ,ツール位置パラメータ,エッジ強度パラメータによって構成される特徴検査パラメータのグループに含まれる少なくとも1つの特徴検査パラメータについての許容される自動調整範囲が、前記画像検査システムにおけるユーザインターフェイスのユーザによる操作に基づいて決定される
ことを特徴とする方法。
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US10/978,227 US7454053B2 (en) | 2004-10-29 | 2004-10-29 | System and method for automatically recovering video tools in a vision system |
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CN (1) | CN1782661B (ja) |
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