A computer-implemented method for determining a resolution at which to generate an image to be displayed in a head mounted display, wherein the display has a standard resolution of N*M pixels, wherein N is a standard value for a horizontal resolution and M is a standard value for a vertical resolution, wherein respective standard resolution values N, M are used as respective target resolution values for image generation, the method further comprising: obtaining motion information of said display; determining a motion direction and motion rate information of the display according to the obtained motion information; determining, according to the motion direction, which ones of said horizontal resolution value and said vertical resolution value need respective target resolution values to be adjusted from corresponding standard resolution values before image generation; adjusting before image generation, for each resolution value which has been determined to be in need of adjustment, corresponding target resolution value by reducing corresponding standard resolution value according to the motion rate direction; and generating a to-be-displayed image such that the horizontal and vertical resolution values of the to-be-displayed image are equal to the respective target resolution values; wherein the adjusting before image generation, for each resolution value which has been determined to be in need of adjustment, corresponding target resolution value by reducing corresponding standard resolution value according to the motion rate direction comprises: determining, by using a resolution ratio determining rule, a resolution ratio corresponding to the motion information; and obtaining the target resolution values according to the standard resolution values and the resolution ratio, wherein in a case that a motion value corresponding to the motion rate information of said display is less than a first threshold, determining that the resolution ratio corresponding to the motion information is a first fixed ratio, wherein also a second ratio is fixed and the resolution ratio is greater than or equal to said second fixed ratio. obtaining motion information of said display; determining a motion direction and motion rate information of the display according to the obtained motion information; determining, according to the motion direction, which ones of said horizontal resolution value and said vertical resolution value need respective target resolution values to be adjusted from corresponding standard resolution values before image generation; adjusting before image generation, for each resolution value which has been determined to be in need of adjustment, corresponding target resolution value by reducing corresponding standard resolution value according to the motion rate direction; and generating a to-be-displayed image such that the horizontal and vertical resolution values of the to-be-displayed image are equal to the respective target resolution values; wherein the adjusting before image generation, for each resolution value which has been determined to be in need of adjustment, corresponding target resolution value by reducing corresponding standard resolution value according to the motion rate direction comprises: determining, by using a resolution ratio determining rule, a resolution ratio corresponding to the motion information; and obtaining the target resolution values according to the standard resolution values and the resolution ratio, wherein in a case that a motion value corresponding to the motion rate information of said display is less than a first threshold, determining that the resolution ratio corresponding to the determining, by using a resolution ratio determining rule, a resolution ratio corresponding to the motion information; and obtaining the target resolution values according to the standard resolution values and the resolution ratio, wherein in a case that a motion value corresponding to the motion rate information of said display is less than a first threshold, determining that the resolution ratio corresponding to the motion information is a first fixed ratio, wherein also a second ratio is fixed and the resolution ratio is greater than or equal to said second fixed ratio.