记住，在您的前景图像中所使用的任何白色像素将提供背景帧的蒙版。
Remember, any white pixels you put in your foreground image will provide a mask over the background frames.
考虑到两个PDF文件之间可能存在一些文本上的差异，例如日期，您可以提供一个蒙版来忽略。
To account for text that would always differ between two PDF files, such as a date, you can provide a mask.
这些发现同时为人体中存在类似费洛蒙的化合物提供了支持。
The findings also add support to the existence of pheromone-like compounds in humans.
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