Image capturing device and digital zoom method

A digital zoom method which is applicable to an image capturing device having a first lens module, a second lens module, a feature extraction unit, an image zooming-deformation unit and an image merging unit;

• wherein a focal length of the second lens module is larger than that of the first lens module, and the digital zoom method comprises:
• (a) respectively capturing a first image and a second image by the first lens module and the second lens module;
• (b) extracting a plurality of first image features of the first image and a plurality of second image features of the second image by the feature extraction unit, and generating pixel offset characteristics among the first and the second images based on the plurality of first image features and the plurality of second image features;
• (c) respectively zooming and deforming the first and the second images based on a zoom factor and the pixel offset characteristics by the image zooming-deformation unit, and generating a third image and a fourth image;
• and
• (d) merging the third and the fourth images based on the zoom factor by the image merging unit to generate a combined image.