Image fusion information extracted from multiple images which is more accurate and reliable than that from just a single
image. Since various images contain different information aspects of the measured parts, and comprehensive information
can be obtained by integrating them together. Image fusion is a main branch of the application of data fusion technology.
At present, it was widely used in computer vision technology, remote sensing, robot vision, medical image processing
and military field. This paper mainly presents image fusion's contents, research methods, and the status quo at home and
abroad, and analyzes the development trend.