| 摘要 |
PURPOSE:To detect the break of a building material on the basis of the change of the luminance value of each pixel on a scanning straight line by allowing each pixel on the scanning straight line to be situated in the image area of the building material. CONSTITUTION:A plurality of the boundary coordinates (a), (b) on a lateral side La are calculated to calculated the straight line LLa passing the boundary coordinates (a), (b). The scanning segment LS preformed into the regular shape of a side LB to be inspected is set so that a reference point BP is positioned on the straight line LLa and the angle thetas formed between the scanning segment LS and the straight line LLa coincides with the angle thetam between the side LB to be inspected and the lateral side La. The distance alpha1 from the point P1 on the scanning segment LS to the side LB to be inspected is calculated and the scanning segment LS is parallelly moved to the position separated by a proper distance obtained by adding a minute distance alphaX to the distance alpha1 to be superposed on an image V to be set thereto and the change of the luminance value of each pixel along the scanning segment LS is caught to discriminate the presence of a break in the side LB to be inspected. |
