The invention discloses a high dynamic-range synthetic imaging method and device, aiming at providing a method for synthesizing two pieces of images with lower dynamic ranges into a piece of image with higher
dynamic range. The high dynamic-range synthetic imaging method comprises the steps of: shooting a same scene at different
exposure time to obtain two pieces of different exposed images; respectively converting the two different exposed images to be in
exposure value spaces according to response curves of a shooting device; weighted-synthesizing scene brightness which is calculated by utilizing
exposure value and exposure time according to brightness of the two pieces of images; and simulated-exposing the synthesized scene brightness through the response curves to obtain the image with
high dynamic range. According to the invention, two pieces of different exposed images are synthesized, and thus the difficulty of
image alignment is reduced; moreover, the
operand and the required storage space in the
processing procedure are reduced, so that the high dynamic-range synthetic imaging method and device can be applied to a small-sized handheld device; and at the same time, the image with
high dynamic range is rich in details at light parts and shadow parts, and the color and the details of the image are in conformity with those of the original scene.