在图像处理中，背景或背景信息是除前景之外的所有区域的图像，一般位于成像系统焦距之外。由于一般图像处理只对前景感兴趣，因此对于背景采取的手段一般是消除。

In the picture the processing, background or background information are in addition to all pictures of districts out of the foreground, locating generally be like system focal distance outside.General picture processing is interested in foreground, so adopt to the background of the means is generally a cancellation.