Image processing method and device and electronic system

The invention provides an image processing method and device, and an electronic system. The method comprises the steps: obtaining a plurality of to-be-processed images which correspond to a target scene, are lower than a preset exposure threshold value in exposure degree, and are the same in exposure degree; performing image registration processing on the plurality of to-be-processed images; and performing image fusion processing on the plurality of to-be-processed images after image registration to obtain an image processing result. According to the method, a plurality of to-be-processed images with the exposure degree lower than a preset exposure degree threshold value and the same exposure degree are shot at night and in other scenes with insufficient illumination, the plurality of to-be-processed images are processed in an image registration and image fusion mode, the image brightness of the plurality of to-be-processed images can be kept consistent in the mode, therefore, the registration effect of the i