Patent ID: 8305466

Claim:
A zoom adjustment system comprising: a touch panel that has an input surface, the touch panel detecting a touch on the input surface and a touched location on the input surface, the input surface being divided into a plurality of areas; a course detector that detects a course traced on the input surface by the touched location when the touched location is moved on the input surface while maintaining continuous contact with the input surface; a first zoom adjuster that adjusts the magnification of a photographic optical system, the photographic optical system being configured to stop a lens at a plurality of locations to perform an optical zoom; and a first detector that detects a first variable, wherein the first zoom adjuster determines which of the plurality of areas the detected traced course passes through, and changes the magnification of the photographic optical system depending upon a determined area, wherein the first zoom adjuster adjusts the magnification of the photographic optical system according to a size of the traced course, the first variable varying according to the magnification of the photographic optical system, a plurality of size thresholds being predetermined in order to compare with the size of the traced course, the first zoom adjuster selectin the size threshold that is immediately smaller than the size of the traced course, the first zoom adjuster adjusting the magnification of the photographic optical system according to a combination of the selected size threshold and the first variable detected by the first detector, the number of the size thresholds to compare with the size of the traced course decreasing as the magnification of the photographic optical system based on the first variable increases.