A novel image-based area measurement system is proposed in this paper, we can convert the pixels of object into real area by image processes. No matter the system is vertical to the measuring plane or not and the height of system, it could calculates arbitrary two points on the image convert into the actual distance. This paper proposed a new structure for achieve our goal, there are four laser projects and camera fixed on same base, then generate four laser spots on the object or measurement plant, and assume connect each two laser spots as parallel lines, finally it could simulated a ruler in the image. Without consider photography angle for this system, it can measure area of floor or height of building.
In this paper, a new distance measuring method to measure the height of a building is proposed.
Traditionally, distance measuring using CCD is based on the parallax method. This paper puts forward a
method of measuring the width and height of a building regardless of the distance of the camera or the angle
between optical axis and ground. By using two parallel laser spots, the distance from the camera to the building
and the height of the building can be determined in a single photo session and with a single picture.
Experiments show that even highly non-orthogonal pictures taken from a short distance can be used to
determine the height of a building. The result will not be affected by the angle between the camera’s optical
axis, the ground and the measured surface.