We developed an automatic segmentation method of intact leaves based on the geometric active contour model according to the characteristics of color leaf images.

针对彩色苗木叶片图像的特点研究了利用几何活动轮廓模型进行完整叶片的自动分割的方法。

youdao

The intrinsic factor influencing the autumn-color leaf is the change of photosynthetic production, and the extrinsic factors are illumination, temperature and moisture.

影响秋色叶变化的内部因素主要是光合产物的变化，外部因素为光照、气温、水分等。

youdao

Do you ever wonder why a fall leaf changes color?

你们有没有想过为什么落叶会变色？

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Locals joke that Yemeni trees are actually blue and red, the color of the plastic bags that you get when you buy qat, a mildly narcotic leaf, and the Yemeni national past time.

VOA: standard.2010.04.01

They vary in color, height, leaf width, softness, and flowering habit.

NPR: Excerpt: 'The American Meadow Garden'