An electronic device and method are disclosed. The electronic device includes a display, a camera module having first and second cameras having first and second viewing angles, respectively, and a processor. The processor implements the method, including: acquiring a first image with a first magnification using the first camera, and displaying the first image on the display, while acquiring the first image, receiving an input requesting changing an image acquisition magnification of the camera module from the first magnification to a second magnification, changing a distance between the first camera and the second camera in response to the input, upon detecting that the changed distance between the first camera and the second camera is less than or equal to a threshold distance, switching from the first camera to the second camera, and acquiring a second image using the second camera, and display the acquired second image on the display.

A digital correlated double sampling circuit includes a first latch circuit, a second latch circuit, a decision circuit, a delay control circuit and a calculating circuit. The first latch circuit stores first reset component data. The second latch circuit stores second reset component data and stores image component data based on a selected comparison signal during an image interval. The decision circuit outputs a decision signal by determining identity of the first reset component data and the second reset component data during the reset interval. The delay control circuit outputs the reset comparison signal and outputs one of the first image comparison signal and the second comparison signal as the selected comparison signal. The calculating circuit generates effective image data by subtracting the second reset component data from the image component data and sequentially outputs the effective image data.