Firstly, the source images are decomposed into sub-images at different scales through Laplacian pyramid transform.

首先，通过拉普拉斯金字塔变换将源图像分解为各级分辨率的子图像。

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In this method, the image is divided into several modules firstly, then these sub-images' eigenvector is extracted by using PCA.

在对图像进行特征提取前，首先对图像进行划分，然后再对子图像使用PC A方法提取特征向量。

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Image segmentation is just to divide an image into different sub-images with different characters and extract some interested objects.

图像分割就是把图像分成各具特性的区域并提取出感兴趣目标的技术和过程。

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Herschel has built a huge catalogue of far-infrared and sub-mm images of the sky.

BBC: Herschel space telescope to go blind

Changes to the feed the key channel on Facebook's service where users post and consume content include a more minimal design, larger images and new types of sub-feeds.

WSJ: Facebook Unveils Sweeping Changes to News Feed