Control method, control device and electronic device

The invention discloses a control method of an electronic device. According to the control method, firstly, an image sensor is controlled for outputting a merged image; secondly, whether the merged image has a face is identified; lastly, when the merged image has the face, the merged image is converted into a merged true color image. The invention further discloses a control device and the electronic device. The control method is advantaged in that whether the merged image has the face is identified, the image sensor is controlled for outputting proper images, large workload of the image sensor for regularly outputting the high-quality images can be avoided, work duration of the electronic device is reduced, work power is improved, and user satisfaction is improved.