David C. Slaughter

Learn More
A real-time intelligent robotic weed control system was developed for selective herbicide application to in-row weeds using machine vision and precision chemical application. The robotic vision system took 0.34s to process one image, representing a 11.43 cm by 10.16 cm region of seedline containing 10 plant objects, allowing the prototype robotic weed(More)
Camera-based 3D reconstruction of physical objects is one of the most popular computer vision trends in recent years. Many systems have been built to model different real-world subjects, but there is lack of a completely robust system for plants. This paper presents a full 3D reconstruction system that incorporates both hardware structures (including the(More)
Occlusion is an obstacle to two−dimensional machine vision recognition of plants in natural outdoor scenes. Five modifications to the Watershed algorithm were investigated for separating occluded plant leaves, in an attempt to reduce the excessive object fragmentation associated with the original Watershed algorithm. The best modified algorithm improved the(More)
Active optical sensing (LIDAR and light curtain transmission) devices mounted on a mobile platform can correctly detect, localize, and classify trees. To conduct an evaluation and comparison of the different sensors, an optical encoder wheel was used for vehicle odometry and provided a measurement of the linear displacement of the prototype vehicle along a(More)
A machine vision system to detect and locate tomato seedlings and weed plants in a commercial agricultural environment was developed and tested. Images acquired in agricultural tomato fields under natural illumination were studied extensively, and an environmentally adaptive image segmentation algorithm was developed to improve machine recognition of plants(More)
UNLABELLED The integrity of onion cells and its impact on tissue texture after high pressure and thermal processing was studied. The contribution of cell membranes and the pectic component of cell walls on the texture properties of onion tissue were analyzed. Neutral red (NR) staining of onion parenchyma cell vacuoles was used for the evaluation of cell(More)
Relationship between nondestructive firmness measurements and commercially important ripening fruit stages for peaches, nectarines and plums Constantino Valero a, Carlos H. Crisosto b,∗, David Slaughter c a Departamento de Ingenierı́a Rural, Universidad Politécnica Madrid, Av. Complutense, Madrid 28040, Spain b Department of Plant Sciences, University of(More)
UNLABELLED A cell viability assessment method based computer vision analysis of the uptake of neutral red dye was used to quantify cell membrane integrity in raw and processed parenchyma cells of onion tissues. The presence of stained vacuoles was used as an indicator of tonoplast membrane integrity and photomicrographs were acquired for microscopic image(More)
Geotrichum candidum is a common soil-borne fungus that causes sour-rot of tomatoes, citrus fruits and vegetables, and is a major contaminant on tomato processing equipment. The aim of this work was to produce a monoclonal antibody and diagnostic assay for its detection in tomato fruit and juice. Using hybridoma technology, a cell line (FE10) was generated(More)
This paper presents research using a correlation-based stereo vision approach to 3D blossom mapping for automated thinning of peach blossoms on perpendicular “V” architecture trees. To this end, a calibrated camera system is proposed, based upon three synchronized ten megapixel cameras and flash illumination for nighttime image acquisition. A(More)