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To compress the photogrammetric image is necessary because of the character of high speed and large amount.

摄影测量图像具有数据量大、传输速度快的特点，所以对图像数据进行实时压缩势在必行。

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The paper analyses the weakness of traditional speed-up techniques for image fractal compression firstly, and proposes a novel idea by using entropy to improve image fractal compress performance.

本文首先分析图像分形压缩技术中传统加速方法的性能缺陷，随后提出使用图像块的熵值来改进分形压缩性能的思想。

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You do it so quickly that the heat flow between the inside of the bicycle pump and the outside is too slow compared to the speed at which you compress.

我们用力很大,于是压缩得很快,打气筒内外热传递的速度,与之相比要慢得多。

麻省理工公开课 - 热力学与动力学课程节选