Alignment of Images with Varying Exposure Level from a Same Scene and HDR Image Construction

A method is proposed for aligning the images taken with varying exposure time and fusing them into a high dynamic range image in this paper.The main steps are as follows:First,the images are filtered by a median filter and binarized.Then the resultant binary images are represented by a pyramid,by which the image translation and rotation are carried out level by level for the alignment.By sampling the aligned images,the camera's response curve,that is,the function between the grey value of a pixel and the exposure time,is fitted by the least squares method,and a high dynamic range image is constructed.The experiments show that the constructed high dynamic range images are satisfactory.