Title page for ETD etd-08022006-185828


Type of Document Master's Thesis
Author Ramirez, Rachael Angela
Author's Email Address rramirez@vt.edu
URN etd-08022006-185828
Title Computer Vision Based Analysis of Broccoli for Application in a Selective Autonomous Harvester
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Reinholtz, Charles F. Committee Chair
Kachroo, Pushkin Committee Member
Nowak, Jerzy Committee Member
Keywords
  • autonomous vehicle
  • mechanical harvester
  • computer vision
  • broccoli
  • co-occurrence matrix
  • texture analysis
Date of Defense 2006-07-25
Availability unrestricted
Abstract
As technology advances in all areas of society and industry, the technology used to produce one of life's essentials - food - is also improving. The majority of agriculture production in developed countries has gone from family farms to industrial operations. With the advent of large-scale farming, the automation of basic farming operations has increasingly made practical and economic sense.

Broccoli, which is still harvested by hand, is one of the most expensive crops to produce. Investing in sensing technology that can provide detailed information about the location, maturity and viability of broccoli heads has the potential to produce great commercial benefits. This technology is also a prerequisite for developing an autonomous harvester that could select and harvest mature heads of broccoli.

This thesis details the work done to develop a computer vision algorithm that has the ability to locate the broccoli head within an image of an entire broccoli plant and to distinguish between mature and immature broccoli heads. Locating the head involves the use of a Hough transform to find the leaf stems and, once the stems are found, the location and extent of the broccoli head can be ascertained with the use of contrast texture analysis at the intersection of the stems. A co-occurrence matrix is then produced of the head and statistical texture analysis is performed to determine the maturity of the broccoli head. The conceptual design of a selective autonomous broccoli harvester, as well as suggestions for further research, is also presented.

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