| 摘要 |
PROBLEM TO BE SOLVED: To easily detect a shading area, and to facilitate recognition of the shape of a curved surface by operating picture analysis by utilizing the change in a differentiating direction. SOLUTION: A non-maximum value is eliminated by performing one- dimensional differentiation to an original picture having object 1 and 2, and then an extended picture processing is operated according to a result obtained by comparing it with a threshold value so that a step-shaped edge can be extracted. Next, a shading area candidate is extracted, and a shading area is extracted. Finally, the step-shaped edge below a constant value in the shading area including the step-shaped edge is deleted as one part of the shading area, and basically separated as a shading area wave step-shaped edge. Thus, the step-shaped edges of the object 1 and 2 are extracted from the original picture by a threshold processing using a differentiating method, the shading area candidates of the object 1 and 2 are extracted according to the change of the differentiating direction of each point of the picture, and the extracted step- shaped edges are compared with the shading area candidates so that the shading areas of the objects 1 and 2 can be extracted. |
