Leaf area measuring method based on lasers and images

The invention discloses a leaf area measuring method based on lasers and images. The leaf area measuring method includes the steps that the number (n) of pixel points of a digital camera is preset; a standard board is used, wherein the length-width ratio of the standard board is the same as the length-width ratio of a screen of the digital camera, and when the shooting range of the digital camera covers the standard board, a laser range finder is used for measuring the distance between the standard board and a lens of the digital camera; when the shooting range of the digital camera is enabled to cover a leaf on a leaf clip, the laser range finder is used for measuring the distance between the leaf clip and the lens of the digital camera, and a photo is shot; according to data acquired from the above steps, the area of a shot image containing the leaf is calculated; and the area of the leaf is obtained according to the area represented by each pixel, and the number of the pixels of the leaf after image processing. According to the leaf area measuring method, based on the optical imaging principle, the laser range finder and the standard board are adopted in the leaf area measuring method, and therefore the detection accuracy and the detection speed of the area of the leaf are improved.