Cotton collected from fields by the workers
contains different types of contaminants such as seed coats
of the cotton seed, human hair, beedi tips, bird feathers,
husks, plastics, papers rugs, etc. These contaminants hinder
the spinning of yarn; affect the quality of thread and subsequently
the weaving of clothes. The presently used methods like plane
thresholding, scanner system, Chinese technique based on comparison
method have their own limitations. In order to overcome these
limitations a system with the application of image processing
based on hue thresholding and masking the plane has scan developed.
Introduction
The system consists of three major parts
- PC based machine visions, image processing and controls.
These broadly include CCD camera, Image grabber/processing
card, personal computer, Fluorescent lamp, 16 pin BNC connector
and Digital I/O etc. The contaminated cotton kept in a transparent
case is subjected to light which focuses the image by means
of lens on the camera and image is grabbed by means of image
grabbing unit. The said image is processed by computer program
to display the contaminants. The intensity of light generates
the control signal for driving away the contaminants. Contaminants
upto 0.1 mm size and almost all the defects other than pure
cotton can be detected. The system is independent of physical
positioning of cotton and probability of contaminants. With
the progressive scan camera, the system can scan the object
at a speed of 1000 m/minute.
Special Features
The system can work with poor lighting and
one light source; All types of contaminants could be detected;
Detection of contaminants while the tuft is in motion is possible;
A low cost system using simple white light.
Prospective Users:Exporters and processors of raw cotton,
spinning mills.
Type of Technology:Machine vision system and Software
Status of IPR Protection:Indian Patent Application no. 926/DEL/2002
dated 12.8.2002 with title "Machine Vision System to
detect contaminents from cotton"
Status of Development:Working prototype has been built and
tested from the end use requirement point of view.
Major Equipment
& Facilities required:Basic
fabrication and assembly facilities are required with an investment
less than Rs. 50,000
Managing Director
Foundation for Innovation and Technology Transfer (FITT)
Indian Institute of Technology, Delhi
Hauz Khas, New Delhi-110016, INDIA
Tel : 91-011-26597167, 26857762, 26581013, 26597153
Fax : 91-011-26851169
E-mail : drkdpn@gmail.com
