| 摘要 |
PURPOSE:To enhance checking accuracy and to shorten a checking time by binarizing picture data, and scanning only the linear peripheral part of the binarized picture data. CONSTITUTION:A check is executed as follows. First, based on the two-dimensional binarized picture data stored into a picture memory 5, a scanning area Wn including the picture data of a linear peripheral part Ln where the omission of the object to be checked is checked is set. Next, the primary straight line expression of the linear peripheral part Ln in the respective scanning areas Wn is calculated. For example, L1=a1x+b1 is obtained. Next, the coordinates of the intersection of the primary straight line expression corresponding to the respectively adjacent linear peripheral parts for the obtained primary straight line expression are obtained. Then, for the obtained section between the adjacent intersection coordinates, whether or not an omission exists in the peripheral part of the object to be checked is scanned along the primary straight line expression. Further, the obtained depth and width of the omission are compared with the values set beforehand, and whether or not it is a defective commodity is decided. |
