Method and apparatus for measuring sizes of objects in image

摘要

Method and apparatus for measuring sizes of objects by using photograph. Method includes taking photograph by using camera; recognizing reference scale in photograph and measuring size of reference scale; measuring vertical direction angle and horizontal direction angle between the camera and the objects by using image properties of the recognized reference scale; recognizing the objects in the photograph and measuring vertical sizes and horizontal sizes of the objects; and acquiring actual vertical sizes and actual horizontal sizes of the objects by compensating the measured vertical size and the measured horizontal size of the objects based on the size of the reference scale, the actual size of the reference scale, and the vertical and horizontal direction angles. Therefore, heights and widths of objects distributed throughout a wide area may be precisely measured regardless of positions of the objects by using a reference scale for comparatively measuring sizes of the objects.

主权项

1. A method of measuring sizes of objects in a photograph including the objects and a reference scale, the method comprising:
taking the photograph by using a camera; recognizing the reference scale in the photograph and measuring a size of the recognized reference scale in the photograph; measuring a vertical direction angle and a horizontal direction angle between the camera and the objects by using image properties of the recognized reference scale; recognizing the objects in the photograph and measuring vertical sizes and horizontal sizes of the recognized objects in the photograph; and acquiring actual vertical sizes and actual horizontal sizes of the objects by compensating the measured vertical size and the measured horizontal size of the recognized objects in the photograph based on the size of the recognized reference scale in the photograph, the actual size of the reference scale, and the vertical and horizontal direction angles, wherein the measuring the vertical direction angle is performed based on a depth distance and a vertical distance between the reference scale and the camera and the measuring the horizontal direction angle is performed based on the depth distance and a horizontal distance from the reference scale to the camera, wherein the reference scale comprises: a light source arranged at a sphere center and a plurality of holes that are formed on the surface of the reference scale and are apart from each other at a regular interval, and wherein the step of measuring direction angles comprises:
measuring intensity of light emitted through recognized holes and determining a hole through which light with the greatest intensity is emitted as a reference hole; andmeasuring the vertical and horizontal direction angles by using the reference hole.