Image-capturing device and method for operating image-capturing system

An image-capturing device comprising:

• a camera module configured to capture an image of an object, wherein the image is displayed by a displayer, and the camera module comprises:
• a first camera having a first field of view (FOV) and configured to capture an image in the first FOV, so as to produce a first image;
• and
• a second camera adjacent to the first camera and having a second FOV, wherein the first FOV is wider than the second FOV, the second camera is configured to capture an image in the second FOV, so as to produce a second image, wherein the displayer displays one of the first and second images;
• a sensor configured to detect an object distance from the object to the camera module;
• and
• a controller configured to select a display region in the first image according to the object distance when a zoom ratio of the first image increases, such that the display region is enlarged and then displayed on the displayer.

A method for operating an image-capturing system comprising:

• producing a first image through capturing an object within a field of view (FOV) by a first camera and producing a second image through capturing the object by a second camera;
• displaying the first image by a displayer, wherein a display region in the first image is selected according to an object distance of the object when a zoom ratio of the first image increases such that the display region is enlarged and then displayed on the displayer;
• and
• switching to display the second image when the zoom ratio of the first image increases to a switch ratio.