求翻译：实验共拍摄红外热像275张，为满足Logistic回归分析对样本量的要求，在每一污秽等级图像中选取正常串图像15张、含零值串图像21张，共计180张图像作为分析样本。是什么意思？

The experiment shooting infrared thermal image 275, to meet the logistic regression analysis of sample size requirements for normal string of 15 images, 21 images containing zero value string, select the image of each pollution class, a total of 180 image analysis of samples.

Experiments take a total of 275 infra-red thermal imaging, to meet Logistic regression analysis of the sample volume requirements, in each of the filthy rating image, select Normal string image 15, image with zero value string 21 sheets, for a total of 180 image analysis of a sample.

The experiment altogether photographs infrared hot elephant 275, for satisfies the Logistic regression analysis to the sample size request, selects normal string image 15, including zero value string image 21 in each contamination rank image, the total 180 images take the analysis sample.

Experimental 275 total shooting infrared thermal image, to meet the requirements of Logistic regression analysis on the sample size, select normal in the each pollution classes image series of 15 images, and those containing the value zero image 21, a total of 180 images as the analysis sample.

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