| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable a roof area to be measured simply. <P>SOLUTION: A measurement zone in the form of a rectangle is set in an image obtained by photographing a roof 4 on which a disk-shaped gauge plate 1 is disposed, and a vanishing point α is set by extending opposite side lines of the rectangle. The points A, B, C and D are established where vanishing lines 10 from the vanishing point α intersect with a side line l<SB>1</SB>of the rectangle of the measurement zone through both end points a, c, the center point b and a point d of the gauge plate 1 on a screen, whereby the both end points a, c and the center point b of the gauge plate 1 are projected. The compound ratio of the projected point sequence abcd is identical to that of the point sequence ABCD. Therefore, the length of the side line l<SB>1</SB>can be calculated from the compound ratio and a dimension of the gauge plate 1. If the length of one side line l<SB>1</SB>can be calculated, the length of an adjacent side line l<SB>2</SB>of the rectangle is calculated similarly, and then the roof area is obtained from the calculated lengths of the side lines l<SB>1</SB>, l<SB>2</SB>. <P>COPYRIGHT: (C)2008,JPO&INPIT |
