Delta-T Devices launches ideal tool for plant pathology applications

Posted On 24 Aug 2009
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The WinDIAS system offers specialised image analysis features suitable for a wide range of applications in the plant sciences. It is specially suited to applications that need high colour discrimination, for example in plant pathology. It provides a full set of measurement statistics, and can process up to 800 leaves per hour using the
conveyor belt option.
The WinDIAS components include a choice of high resolution colour USB video cameras with a lightbox and overhead lighting rig to ensure good contrast and colour rendition, or alternatively an A4 scanner with excellent depth of field. For reporting and further analysis, all results and images from WinDIAS are easily exchanged with other Windows applications.
Three thresholds can be set, each based on a different user-defined range of colours. The primary threshold is used for the main zones of interest in the image, e.g. healthy areas. The secondary and tertiary thresholds are used for other zones, e.g. diseased areas. Thresholds are set by a simple point and click with the mouse in a region of interest. The areas included are immediately visible as overlays on the image.
Images can be edited on-screen to retouch boundaries, separate objects that overlap, remove undesirable "noise" and holes, add or erase lines or rectangles, and fill bounded areas in any colour.
WinDIAS analyses the thresholded regions to measure area, perimeter, length, width, circularity, elongation and shape factor. A correction factor can be applied to estimate the surface area (of pine needles for example) from the projected area. Calibration is carried out against a ruler. Object count: Seeds, needles, or other small
objects can be quickly counted by WinDIAS. Colour thresholding enables easy discrimination of different types of object, or disease spots. Dust and debris can be excluded by defining a minimum object area.
The WinDIAS 3 Standard System includes USB colour video camera, camera stand, lightbox, overhead lighting rig and WinDIAS software. The standard system enables full analysis of static images illuminated by lightbox or overhead lights, typically 2 or 3 images per minute. The Standard System camera has excellent resolution at 2048 x 1536 pixels but cannot be used for moving images.

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