2004 Volume 45 Issue 1 Pages 13-21
It is available to measure the scale of objects applying magnification equation of lens for a photographed image, when the objects are lying in a distant place or too dangerous to access to the places. In practical cases, accurate scale of object can not be measured correctly when only the magnification equation of lens is applied simply to an image, because objects both lying in near place and distant place are photographed in the same frame. Here, method of scale correction was studied initially, because the way of scale correction itself considering slope angle was necessary to calculate the correct lengths of photographed objects. Then, validity of the scale correction method considering slope angle was examined, applying this method to an object model of hexagonal shape on a slope, distributed rocks on a flat board and excavated rocks by blasting. From these examinations, it was confirmed that corrected rate on the scale of hexagonal model was 0.85-1.04 and the rate on the distribution characteristic value of excavated rocks by blasting was 0.94. This correction method is considered to be available for the scale measurement using a photographed image.
