SummaryImage analysis gave better precision than colorimetry in measuring the darkening caused by excess free sugar during crisping of potatoes. The image analyser was used to measure individual crisp Average Optical Density (AOD) values in order to examine the variability of AOD within and between tubers. It is unnecessary to measure more than one crisp per tuber when assessing breeding lines, although two crisps per tuber are recommended for quality control. Crisps from at least ten tubers should be measured.A ‘Quick Crisp’ method, in which single crisps from each of four tubers are judged against standard samples, is reported. Regression of results from this method on crisp reflectance percentage (Agtron score) gaveR2 of 0.967. However, the observer tended to overestimate at low values and underestimate at high values. Over several trials, the crossover point varied from 15 to 50 Agtron score units.Measurement of crisp colour variability for improving selection, management and purchasing decisions is discussed.
[1]
G. Coles,et al.
Predicting potato crisp darkening: Two methods for analysis of glucose
,
1991
.
[2]
W. Gould,et al.
EFFECT OF STORAGE CONDITIONS ON CHIP QUALITY OF POTATOES
,
1977
.
[3]
A. J. Conner,et al.
Monitoring hairy-root growth by image analysis
,
1991,
Plant Molecular Biology Reporter.
[4]
Azriel Rosenfeld,et al.
Image analysis and computer vision: 1988
,
1989,
Comput. Vis. Graph. Image Process..
[5]
P. A. Xander,et al.
Potato composition and chipping quality
,
1961,
American Potato Journal.
[6]
L. R. Jarvis,et al.
Microcomputer video image analysis
,
1988
.