Submitted to: American Peanut Research and Education Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 4/1/2002
Publication Date: 11/1/2002
Citation: BLANKENSHIP, P.D., SHEPPARD, H.T., SANDERS, T.H., BOLDER, D. DEVELOPMENT OF A LOW-COST IMAGING SYSTEM FOR DETERMINING SHELL BRIGHTNESS OF VALENCIA PEANUTS. AMERICAN PEANUT RESEARCH AND EDUCATION SOCIETY ABSTRACTS. 2002. Abstract p. 76. Interpretive Summary: not required.
Technical Abstract: Most valencia peanuts are consumer marketed by processors in-shell after farmer marketing. Shell brightness is an important consumer factor. During farmer marketing, percent discolored shells is determined subjectively during the farmer stock grading procedure. If discolored shells are 25 % or greater, lot value is reduced. This study was performed utilizing the pods from 220 samples scored by New Mexico inspectors during the 2001 harvest of valencia peanuts in Portales, NM. Three low-cost imaging systems were designed and evaluated during the study. One system measured shell brightness using two contrast sensors located on opposite sides of individual pods moving past the sensors. The other two systems utilized digital video cameras with accompanying hardware and software evaluating pods grouped from the samples spread into single layers. Shell brightness was measured on opposite sides of layers after rotation. As a standard, Hunter L value of each pod sample was determined three times with mixing of pods after each determination. The measurements of shell brightness from all systems were correlated and compared to the percentage of the discolored pods determined during official grading.