In order to reduce the complexity of motion estimation and improve the efficiency of the video encoder

an adaptive motion estimation search algorithm based on motion intensity is proposed.Motion intensity reflects the intensity of motion between adjacent frames.By defining the concept of motion intensity

the movement of the next frame is predicted based on the measured intensity information of the current frame

and a different motion search algorithm is selected adaptively.If the motion intensity of the current frame is greater than the threshold

the UMHexagonS search algorithm is chosen

otherwise the improved hexagon search algorithm is chosen.Simulation results show that the coding efficiency is improved significantly

while the image quality and compression performance change little.In addition

the threshold of motion intensity in the algorithm is adjustable

thus the demands of different encoding can be met by changing the threshold.