The invention provides an image processing method and an electronic device. An image acquisition unit in the electronic device is capable of collecting a first image which comprises a projected image and a background image and a second image which only comprises a background image. The method includes that the first image and the second image are carried out processing according to a first pre-set rule and a third image is obtained, wherein, the third image only comprises a projected image. Then, the third image is carried out an image binaryzation processing; a fourth image after the image binaryzation processing is obtained. At last, the fourth image is carried out processing according to a second pre-set rule and outline information of the projected image in the fourth image is obtained. Technical Problems that in the existing technology, the background image and the projected image of the images are difficult to tell and a projection interaction device cannot accurately detect the outline and the vertex of the projected image caused by the outside environment and illumination as well as the time of exposure of the image acquisition unit.