Method for measuring leaf area by manually shooting

Abstract

The invention discloses a method for measuring a leaf area by manually shooting. Aiming at the defects that the conditions required by shooting the leaf images are hardly met in the open air and the effect on image post-processing is poor, and the like in the prior art, the invention provides the method for measuring the leaf area by manually shooting. When a leaf plane image is acquired, the leaf is placed on a standard template with standard control points; image inversion is performed on the shot image on the basis of correspondence of the standard control points between coordinate positions on different images and spatial relationships, and orthographic images of the shot images are acquired; and each leaf image area in the acquired orthographic images is calculated by using the image processing software. Compared with the prior art, the method has the advantage that: the needed equipment is particularly simple and convenient to carry when the method is implemented, manual shooting is performed by only using a common digital camera during the leaf shooting, the image post-processing only needs conventional software, the measured result is accurate and credible, and the error can be controlled. The complete set of the method for measuring the leaf area by manually shooting is particularly suitable for the requirement on field survey.

Description

Technical field [0001] The invention relates to a measuring method, in particular to a method for measuring the area of ​​a leaf by freehand photography. Background technique [0002] Plant leaf area indicators are one of the important contents in the research fields of agriculture, forestry, ecology, and botany. The size of leaf area is one of the indicators to measure the photosynthetic capacity of plants, and the change of leaf area is one of the indicators of plant development and environmental changes. Therefore, accurate measurement of leaf area and its changes is of great significance for grasping the development status of plants, understanding the response of plants to the environment, and determining a reasonable management environment model. [0003] Currently, there are various methods for measuring leaf area. Among them, the image measurement method is very popular in plant leaf area measurement because it only needs to obtain the image of the leaf to measure the area ...

AI Technical Summary

Problems solved by technology

There are at least four deficiencies in this measurement system and method: 1. The automatic grid corner extraction method (grid corner extraction) is used in the calculation of the transformed coordinates, that is, there must be a grid network on the calibration plate, and it is necessary to ensure that the calibration plate The grid is sufficient, and the area surrounded by control points cannot be blocked by leaves. For this reason, this technical solution uses a self-designed PCB as a calibration board, which limits the applicability of the measurement method and increases the equipment cost.

However, such requirements are difficult to meet in actual conditions, so the quality of the obtained image segmentation is very poor; and the manual segmentation method is very time-consuming and labor-intensive.

In general, the quality of this method in image leaf segmentation processing is very low

Moreover, using the commercial software PHOTOSHOP or the free image processing software GIMP can easily obtain leaf images with better separation effects than the above-mentioned patent method, so this method has neither simple operation nor good effect

4. Due to the above-mentioned leaf segmentation processing method, the actual processing effect of this measurement method will not be very good when there are many leaves, especially due to the blade edge shadows produced by thicker leaves, and complex leaf colors and other factors. Reduced method throughput

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