Based on overall analysis of apple shape, originally, the reference shape method was used in apple shape feature extraction.

首次将参考形状分析法用于果形判别，利用人工神经网络对果形进行识别和分级。

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Shape feature extraction and description are one of important research topics in content-based image retrieval.

形状特征提取和表示是基于内容图像检索的重要研究内容之一。

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Shape feature extraction and description are one of important research topics in content-based image retrieval.

形状特征提取和表示是基于内容图像检索的重要研究内容之一。

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