A Comparative Review of Aspect Ratio Conversion Methods

The Aspect ratio is the fractional relation of the width of a video image compared to its height. Because of the historical and some other factors, there are so many video formats with different aspect ratios and the conversion of aspect ratio is required more and more imminently. The paper introduced all the aspect ratio conversion methods published in literatures, including cropping method, expanding method and so on, and presented experiment results to demonstrate the advantages and disadvantages of each conversion method.