Image processing device

Abstract

Abstract Translated from Japanese (57)【要約】 （修正有） 【目的】濃淡画像の対象物のエッジ情報を元に、目視に 近い間隔で、容易に、少ない計算量で濃淡画像のテクス チャの定量化。 【構成】搬送被検査物の鋼板１が照明２で照らされ、鋼 板１の表面の傷や凹み等の欠陥３はカメラ４にて撮像さ れ、鋼板１の表面画像が信号処理回路５でＡ／Ｄ変換さ れ、出力画像データを画像メモリ６に記憶する。この画 像メモリ６からの画像データからマスク設定回路７で任 意の矩形領域を設定し、微分処理回路８で微分処理し、 特徴量算出回路９で、矩形領域内の欠陥のエッジとみな せる所定値以上の微分情報の和又は自乗和と、その微分 情報の画素の個数を算出する。欠陥のエッジとみなせる 所定値以上の微分情報の和又は自乗和並びに微分情報の 画素の個数は夫々、矩形領域内のエッジの強さとコント ラスト、並びにエッジの数を表わしており、欠陥有無、 存在度判定回路１０で、これらに基づいて、鋼板１表面 の欠陥の有無、存在度を判断する。 (57) [Summary] (Corrected) [Purpose] Based on the edge information of the object in the grayscale image, the texture of the grayscale image can be easily quantified with a small amount of calculation at intervals close to visual observation. [Structure] A steel plate 1 of a conveyed inspection object is illuminated by an illumination 2, defects 3 such as scratches and dents on the surface of the steel plate 1 are picked up by a camera 4, and a surface image of the steel plate 1 is A / The D-converted output image data is stored in the image memory 6. From the image data from the image memory 6, a mask setting circuit 7 sets an arbitrary rectangular area, and a differentiation processing circuit 8 differentiates it. The feature amount calculation circuit 9 calculates the sum or squared sum of the differential information equal to or larger than a predetermined value that can be regarded as the edge of the defect in the rectangular area, and the number of pixels of the differential information. The sum or square sum of the differential information of a predetermined value or more that can be regarded as a defect edge and the number of pixels of the differential information respectively represent the strength and contrast of the edge in the rectangular area, and the number of edges. The presence determination circuit 10 determines the presence or absence of defects on the surface of the steel sheet 1 and the presence thereof based on these.

Inventors

• 👤 Riyouichi Danki
• 👤 亮一 段木
• 👤 Tetsuji Uetake
• 👤 徹司 植竹

Bibliographic Details