Preliminary Study on Appearance Quality Evaluation of Semi-Waxy Rice in Yangtze River Delta Region
[Objective]Due to the cloudy and translucent appearance characteristics of semi-waxy rice,there is a lack of effective evaluation methods in the industry at present.It is necessary to construct an evaluation method for the appearance quality of semi-waxy,and classify the appearance quality of semi-waxy rice,so as to provide technical support for the standardization and development of semi-waxy rice industry.[Method]In this study,according to GB/T 15682-2008"Grain and Oil Inspection of rice,Rice cooking and edible quality sensory evaluation method",the appearance quality score of semi-waxy rice was obtained by artificial evaluation method,and various appearance indexes of semi-waxy rice were measured,including chalkiness,transparency,grain type and color space related indexes.Pearson correlation coefficient,max-relevance and min-redundancy,competitive adaptive reweighted sampling and intersection feature selection methods were used to analyze the relationship between chalkiness,transparency,grain shape and color space related indicators and the appearance sensory score of semi-waxy rice,and select the core indicators that can determine the appearance quality of semi-waxy rice for constructing and verification of semi-waxy rice appearance evaluation model.Finally,the model was used to estimate the overall appearance quality of semi-waxy rice in the Yangtze River Delta region and graded according to the estimated score.[Result]Through comparing the estimation accuracy and stability of four models,this study found that the semi-waxy rice appearance evaluation model,represented by the equation Y=5.68+0.17X4+0.19X6-0.03X9-0.12X10,demonstrated the highest accuracy and stability.This model was constructed using chalk rice transparency(X4),overall transparency(X6),chalkiness(X9),and L*(X10),which were selected by the intersection feature selection method.Notably,this model incorporates the fewest number of indicators,with a coefficient of determination(R2)of 0.86 during model validation and a simulated root mean square error(RMSE)of 0.32.After using this model to estimate the appearance of most of the semi-waxy rice in the three rice-growing areas of the Yangtze River Delta,It was found that the appearance scores of the first 20％,20％-50％,50％-90％and last 10％of semi-waxy rice materials in the Yangtze River Delta region in this study were greater than 0.23,-0.48-0.23,-1.68--0.48 and less than-1.68,respectively,which can represent four levels of appearance quality of semi-waxy rice in practical applications:Level 1,Level 2,Level 3,Out of level.At the same time,it was found that there were significant gradient differences in grain type,chalkiness,transparency and color space among different appearance grades of semi-waxy rice,but there were different degrees of crossover between their value ranges.[Conclusion]Using chalk rice transparency(X4),overall transparency(X6),chalkiness(X9),and L*(X10),an effective estimation model of semi-waxy rice appearance could be established:Y=5.68+0.17X4+0.19X6-0.03X9-0.12X10.With reference to the scoring range of each appearance grade of semi-waxy rice in Yangtze River Delta region,the appearance of a single semi-waxy rice material can be quickly determined by the appearance estimation score.The evaluation of semi-waxy rice by appearance estimation model is beneficial to take into account the different appearance phenotypes of semi-waxy rice,and can accurately reflect the actual situation of semi-waxy rice appearance.
japonica ricesemi-waxy ricevisual estimationselection of visual featuresregression analysissensory evaluation
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