Because the inside work processing of engine is very complex, and the influence factor are numerous, the heat transfer and thermal load inside engine are primarily investigated by means of experiment.

由于发动机内工作过程非常复杂、影响因素众多，对发动机内传热及热负荷的研究目前主要还是采用实验测试的方法。

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The purpose of pre-processing is to decrease the influence of the environment such as illumination, temperature, noise and the unstable factor of the stream line.

在对采集图像进行预处理时，目的是为了去掉环境对图像的影响，如光照，温度，噪声以及因为流水线不稳定等因素造成的影响。

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