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Quick and accurate assessment of fish freshness is of great significance for intelligent quality monitoring and ensuring the safety of consumers. In the current fish freshness evaluation method based on visual images, the study of fish gills needs to remove the gill cover, which is invasive to the fish body, and the analysis of other parts has a low evaluation accuracy. To solve the above problems, a fish freshness classification method based on color histogram & grey-level co-occurrence matrix-linear discriminant analysis (CHG-LDA) was proposed. Firstly, preprocessing operations such as labeling, image zooming and color space conversion were performed on the collected fish images. Secondly, the extracted color histogram features and grey-level co-occurrence matrix (GLCM) features were fused to constitute the features, and the feature dimension was reduced by LDA. Finally, K-nearest neighbor (KNN) algorithm was used to classify fish freshness. The CHG-LDA method proposed solved the problem of poor classification performance caused by the low quality of the extracted fish image features. The experiment was carried out on a real crucian data set, and the index values of precision, recall, F1-score and accuracy were all 1. Compared with color histogram features, color moment, GLCM features, etc., this method improved the performance of each evaluation index on KNN, RF, ANN, and LightGBM classifiers. Among them, the evaluation time of KNN was the best, which was 0.01s. Experimental results showed that this method can achieve accurate and non-destructive evaluation of fish freshness, and it was feasible for actual production monitoring. 相似文献
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壳聚糖添加纳米碳酸钙助剂对鲜切山药品质的影 总被引：4，自引：0，他引：4
为了探索纳米碳酸钙助剂对鲜切山药保鲜效果的影响,研究了壳聚糖添加纳米碳酸钙助剂对鲜切山药在10℃下品质的影响.结果表明,壳聚糖添加纳米碳酸钙助剂处理后鲜切山药的总酸度、Vc含量和L值分别比单独使用壳聚糖高10.5%、8.4%和6.9%;失重率和总酚含量分别比单独使用壳聚糖低9.2%和8.3%.壳聚糖添加纳米碳酸钙助剂可显著抑制多酚氧化酶和过氧化物酶活性,延缓果实褐变,延长货架期.添加纳米碳酸钙助剂可显著提高壳聚糖对鲜切山药的保鲜效果. 相似文献
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通过远缘杂交技术“复态导入法”将野生植物“菰”的有利性状导入到水稻品种“松前”中,创造出了丰富的崭新的转菰后代材料。后代材料通过鉴定,再采用人工杂交育种的方法,选育出水稻新品种通育239。该品种具有优质、高产、抗性强的特点,成为吉林省水稻生产上主推品种之一。 相似文献
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