Augmented reality system which is based on ARToolKit development kit.Since the image segmentation threshold is fixed

when the scene changes greatly

it cannot achieve augmented reality. In order to solve this problem

we put forward the calculation of the image threshold for real-time image in the video sequence with the minimum error method

when the scene changes

the threshold will change accordingly. In the ARToolKit system we do some augmented reality experimental research on marker rotating case. The result shows that the method can still achieve augmented reality when the scene changes a lot

which proves the validity and real-time of the method. Thus

it can improve the overall performance of ARToolKit enhanced reality system.