A Grading Method for Mangoes on the Basis of Peel Color Measurement Using a Computer Vision System
| dc.contributor.author | Makino, Yoshio | |
| dc.contributor.author | Goto, Kenjiro | |
| dc.contributor.author | Oshita, Seiichi | |
| dc.contributor.author | Sato, Akari | |
| dc.contributor.author | Tsukada, Masato | |
| dc.date.accessioned | 2018-08-01T09:20:28Z | |
| dc.date.available | 2018-08-01T09:20:28Z | |
| dc.date.issued | 2016-06 | |
| dc.description.abstract | An objective grading method using a Computer Vision System (CVS) for mangoes is proposed. Red peel was selected using two types of color space values at chroma = 22 and hue angle = 52˚. Eighteen out of 25 fully-ripened fruits were graded as “excellent,” determined by the share of red area per fruit being in the range of 80% - 100%. In contrast, all green-mature fruits were graded as “fair,” where the share of red area per fruit was <30%. If the threshold for the share of the red area on the peel is set between 10% (maximal green-mature fruits) and 18% (minimal fully-ripened fruits), automatic removal of green-mature fruits on a grading line is feasible. CVS was effective for nondestructively assuming anthocyanin concentration. A linear relationship between the natural logarithm of the concentration and hue angle was observed (y = −0.0542x + 7.83), with a correlation coefficient accuracy of 0.94 and root mean square error of 1.31 mg∙kg−1. This result may be effective for the visualization of anthocyanin distribution on mango skin. The threshold for red peel can be in the range of 131 - 186 mg∙kg−1. This suggests that the pigment concentration is usable as a universal threshold. This value is unaffected by conditions for image acquisition or color measurement (e.g., light source, sensor, filter, and optical geometry), unlike color space values as hue angle. | en_US |
| dc.identifier.citation | Agricultural Sciences, 2016, 7, 327-334 | en_US |
| dc.identifier.issn | 2156-8561 | |
| dc.identifier.uri | http://dx.doi.org/10.4236/as.2016.76033 | |
| dc.identifier.uri | http://hdl.handle.net/123456789/2052 | |
| dc.language.iso | en | en_US |
| dc.publisher | Scientific Research | en_US |
| dc.subject | Mangifera indica L. | en_US |
| dc.subject | Nondestructive Analysis | en_US |
| dc.subject | Digital Camera | en_US |
| dc.subject | Anthocyanin | en_US |
| dc.title | A Grading Method for Mangoes on the Basis of Peel Color Measurement Using a Computer Vision System | en_US |
| dc.type | Article | en_US |