The accurate estimation of the point spread function (PSF) is very important in restoration of motion-blurred image. The uniform linear motion blur PSF is composed of two parameters

namely blur angle（direction） and blur length. However

estimation of the motion-blurred angle is the most important. The motion-blurred direction based on Hough transform

which is proposed by R. Lokhande et al

is improved. The improvement adopts more pretreatments such as edge detection

detect the straight line by Hough transform

and takes advantage of the improved Hough transform peak extraction method to estimate the value of the angle. Experiments show that the method can be more accurate than the original method of angle values

and has anti-noise ability

identification of high precision.