Image acquisition method and device, electronic device and computer readable storage medium

The invention discloses an image acquisition method and device, an electronic device and a computer readable storage medium. The method comprises the following steps: acquiring a first brightness at a first end point, a second brightness at a second end point and a sampling brightness between the first end point and the second end point of a target acquired by using a reference aperture diameter of a lens in an observation area; wherein the first end point corresponds to the position of the light of the first light intensity of the target away from the lens, the second end point corresponds to the position of the light of the second light intensity of the target entering the lens, and the first light intensity is smaller than the second light intensity; based on the reference aperture diameter, the first brightness, the second brightness and the sampling brightness, determining an aperture diameter control curve corresponding to the lens when the target moves in the observation area; and acquiring a target im