Plant Canopy Image Analyser IN-G30

Plant Canopy Image Analyser

I. Purpose

Plant canopy image analyser according to a variety of image processing means to extract a number of angles of the canopy gap rate, the use of fisheye lens camera assembly from under the canopy up to shoot canopy photos, the use of the gap rate parameters to perform a variety of canopy parameters, guide the field of reasonable fertilization, modern farms and efficient management to provide a reliable scientific basis, widely used in agriculture, forestry, plant and other scientific research and production guidance.

II. Testing principle and method

Plant canopy image analyser adopts the principle of correlation between canopy porosity and canopy structure. It is based on Beer's law of light weakening through the medium, in the plant canopy defined a series of assumptions under the conditions of the premise, the use of half-theoretical and half-empirical formulas, through the determination of the canopy porosity, calculated canopy structure parameters. This is the principle consistently adopted by all kinds of canopy meters in the world at present. Under the above principle, the plant canopy image analyser adopts the method of measuring the canopy porosity by analysing the image of the hemisphere of the sky dome under the canopy, which is the most accurate and the most labour-saving, time-saving, quick and convenient method among all kinds of methods.

III. Structural composition

The plant canopy image analyser consists of a fisheye image capture probe (composed of a fisheye lens and a CMOS image sensor), a measuring rod (rocker arm) with 25 built-in PAR sensors, a laptop computer, and image analysis software. The fisheye probe is mounted on the tip of a very lightweight rocker arm, which acquires fisheye images with a 180° viewing angle. The display and storage of the images is done by the configured laptop computer.

IV. Technical indicators

1. Measurable indicators:

Leaf area index

Leaf blade average inclination angle

Aggregation index 1

Aggregation index 2

Crown openness

Sky Diffuse Light Transmittance

Transmittance of direct radiation from plant canopies at different solar altitude angles (Gap rate Transmittance rate)

Canopy extinction coefficient at different solar altitude angles

Azimuthal distribution of leaf area density (opacity)

Photosynthetically Active Radiation (PAR)

2. Lens Angle: 180°.

3. Resolution: 2592 × 1944

4. Measurement range: Zenith angle from 0 ° to 90 ° (180 ° fisheye lens) can be divided into ten areas, azimuth angle of 360 ° can also be divided into ten areas

5. PAR sensing range: sensing spectrum 400nm ~ 700nm

6. Measuring range: 0-3000μmol/m2-S.

7. Analysis software: plant canopy analysis system

8. Weight: 500g

9. working and storage environment: -10℃~55℃ ≤85% relative humidity

10. Transmission interface: USB

V. Functional features

1. fisheye lens can automatically maintain the horizontal state: specially designed for plant canopy structure measurement of small fisheye camera lens mounted on the handheld universal balance connector, can automatically keep the lens in a horizontal state, without tripod;

2. fisheye lens can be extended into the canopy: the lens is mounted on the end of the swing arm, due to the small size and with a measuring rod, it can be easily extended horizontally forward or vertically upward to different heights of the canopy, and quickly carry out stratification measurements, and measure the light transmittance rate and the leaf area index of the group of vertical distribution maps;

3. image analysis software: image analysis software can arbitrarily define the image analysis area (zenith angle can be divided into 10 zones, azimuth angle can be divided into 10 zones).

4. can shield unreasonable canopy part: different directions of the canopy for regional analysis, you can arbitrarily shield the landscape and unreasonable canopy part (such as the lack of plants, side rows of the problem, etc.).

5. Automated threshold adjustment, avoiding the increase of error caused by subjective threshold setting.

6. Real-time display of GPS satellite positioning latitude and longitude, clear current detection position

7. Detection results can be directly transmitted to the exclusive cloud agricultural data centre, equipped with the exclusive cloud agricultural data centre account

8. Data browsing: historical data can be browsed

9. Built-in Chinese and English bilingual display, one-key switching