Wide area measurement of piled logs using smartphone camera

Previously, estimation of piled logs scattered in wide area is processed via hi-definition fixed camera which is not effective because the camera is attracted to be stolen. Therefore, the method to calculate area of segmented outdoor piled logs is now implemented on a smartphone which consists of an orientation sensor in order to benefit mobile usage and reduce cost of camera installation. The method is two-dimensional area calculation of piled logs with virtual ruler grid based on images taken through a calibrated smartphone camera. The result shows that the proposed method is able to alleviate time-consuming issue, the method accuracy is relatively 88% compared to measuring by a tape measure.