HemiView Plant Image Analysis System

HemiViewPlant Image Analysis SystemPurpose:

Obtain information related to canopy structure, such as leaf area index, light gaps, and gap distribution, by processing image data files. By analyzing the relevant information of radiation data, it is possible to calculate the interception of the canopyPARAnd the radiation level below the canopy. Its software can calculate radiation indicators, canopy indicators, light coverage conditions at measurement sites, and the distribution of direct and diffuse light.

use180Fish eye lens and high-definition digital camera capture images from below the plant canopy or above the forest floor,Then load the high-definition images from the digital camera into the software for analysis and processing.

HemiViewPlant imagesanalysis systemFeatures:

·Interactive graphic positioning tool: a hemisphere coordinate system for accurately recording images. Compensate for magnetic field deviation;

·Support image classification: distinguish between intensity boundaries and interfering pixels. Images are classified according to real-time updates;

·Images can be viewed in multiple and split formats: classification and color/Gray equal ratio viewing, or splitting the entire image for browsing;

·Image film: Images can be converted to film mode for viewing and analysis;

·Different sky regions can be defined with numbers: zenith angle and azimuth angle define ranges;

·The leaf area of a single tree can be directly measured byHemiViewOutput a single treeLAI；

·Analyze local images: You can exclude parts of the image that do not need to be analyzed;

·Location, lens, and sun model parameters: Users can set location, lens, and sun modes to apply to any image, making it easy to select from a list;

·Defining the characteristics of a lens: The lens equation is when the user uses the current lens and the Δ provided by the previous model typeT；

·Output: The analysis results can be output asExcelCompatible with table or text formats;

·Custom output parameters: Users can define different output parameters based on different images.

HemiViewPlant imagesAnalyze system inputOutput parameters:
·Sky geometry: centroid, solid angle, and pixel calculations are used for each sky sector;
·Gap particle size: visible sky sector in proportion;
·Leaf area index: sky sector or all values;
·Solar radiation: direct and scattered, above and below the canopy, units of energy or mass;
·Position factor: direct, indirect (scattering), all;
·Time series and Sunlocks: allows viewing of the date's daily chart (semi shaded effect) and solar radiation, with user-defined sampling intervals or Sunlocks sequence
·Optional cosine correction: can capture surfaces from any orientation;
All values: Most outputs can tabular sky sectors and aggregate them into a single all sky or annual value.

parameter

Image file types: BMP, JPEG, TIF, Photo CD

Image resolution: the smallest is 512 × 512, the largest is 4368 × 2912 (related to digital cameras)

Lens distortion: capable of multiple related zenith angles and ray distances

Direct light model: simple air transmission, set by the user

Scattered light model: Unified or standard cloudy day

Data output: Excel compatible table format

Total pixels: 15.1 million pixels

The maximum supported image resolution is 4368 × 2912 pixels

Fish eye lens angle: 180 °

Storage capacity: 2GB, expandable

Scalable single arm bracket height: 0.69-1.66 meters

Tripod height: maximum height 1.73 meters