The methods for measuring the leaf area mainly include square grid method, copy weighing method, regression equation method for measuring the length and width of the blade, and scanning method based on image processing technology. Among them, the grid method, weighing method and regression equation method have been widely used in agricultural research, but the accuracy in the determination of leaf area is not enough and the time-consuming consumables; the scanning method based on image processing technology, the use of scanners with high resolution characteristics The leaf area of ​​the plant can be measured with high precision, but due to the need to remove the leaf for measurement, the use has been limited. Based on the digital image acquisition system of portable digital cameras, bilinear mapping algorithm, image threshold method and histogram method are used to correct image and image binary values ​​to extract the effective points of the leaves of plants to calculate the leaf area and solve the previous leaf area measurement. All kinds of drawbacks can make non-destructive measurements on the blades. Of course, the non-destructive measurement of the blades, in addition to the above-mentioned ones, also includes a leaf area meter, in which a leaf area meter is handheld, and the leaf area meter is an easy-to-use portable device that can be operated in the field. Leaf area meter. Its greatest advantage is that it can measure the leaf area and correlation coefficient of the blade accurately, quickly and without damage. It can also measure the area of ​​the plant leaves and other leaves that are picked. Abc Fire Extinguisher,Fire Extinguisher For Home Use,Easy Fire Extinguisher,Fire Extinguisher For Car Jiangsu Minnuo Group Co., Ltd , https://www.minnuocylinder.com
Adopting a digital image acquisition system based on a portable digital camera will result in geometric distortions such as translation, scaling, and rotation of the captured image of the blade. The phenomenon of distortion will not be eliminated and will inevitably affect the measurement accuracy of the leaf area. Therefore, the distorted image must be processed before measuring the area. Accurate geometric correction. After correcting the distorted image, a pattern similar to the actual blade is obtained, and then the actual blade area is calculated. A digital image acquisition system using a portable digital camera collects images of the leaves without picking the leaves, which protects the continuity of the crop growth. Using the projection method to measure the leaf area of ​​soybean, the validity of the measurement is not affected by the size and shape of the leaf and the white background around the leaf in the image of the leaf. Experiments verify that the method can correct the image of the leaf. The above method can be extended to other field crops, providing practical and scientific methods for agricultural production and life and agricultural researchers, laying a solid technical foundation for future crop variety identification, feature identification, color identification and disease diagnosis. . However, in this method operation, we need to pay attention to: the effect of light intensity will cause image color information to be lost, the number of correction coefficients will affect the area of ​​constrained blocks in the image, thus affecting the accuracy of correction, so human factors should be minimized. And to avoid external factors interference.
Non-destructive measurement of plant leaf area