We present an improved PGA algorithm based on image patch.

本文提出了一种基于图像分块的改进PGA算法。

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Because of the matching between the candidated image patch and the prior knowledge, it need not the template updating.

由于跟踪系统事先学习到了目标的“知识”，故匹配发生在候选图像块与先验知识之间，而不必考虑模板更新。

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Almost every fuzzy yellow patch in the above image is an entire galaxy.

上图中几乎每一个模糊的黄色斑块都是一个完整的星系。

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In this image taken of a small patch of sky in the constellation of Ursa Major, countless galaxies are recorded.

BBC: Herschel space telescope to go blind