Method and apparatus for compositing image by using multiple focal lengths for zooming image
Provided are an image zooming method and an image zooming apparatus for optical zooming by using a plurality of lenses with different focal lengths. The image zooming method includes capturing an identical scene via a plurality of lenses; obtaining a first image and a second image of the identical scene that have different resolving powers; determining a first area of the first image and a second area of the second image which corresponds to the first area; and generating a composite image the second area and a remaining area of the first image from which the first area is excluded.
1. An image zooming apparatus comprising:
a first lens having a first modulation transfer function (MTF) curve;
a second lens having a second MTF curve that is different from the first MTF curve; and
an imaging processor configured to obtain a first image from the first lens and a second image from the second lens, determine a region of interest (ROI) from the first image and a corresponding region from the second image, and generate a composite image by combining the first image and the second image, wherein the ROI and the corresponding region represent an identical object.
2. The imaging zooming apparatus of claim 1 , wherein the imaging processor is further configured to generate the composite image by combining the corresponding region of the second image and a remaining region of the first image from which the ROI is excluded.
3. The imaging zooming apparatus of claim 2 , wherein the imaging processor is further configured to determine a range of distances of the ROI measured from a center of the first image, and combine the corresponding region of the second image and the remaining region of the first image in response to a resolving power value of the second MTF curve being greater than a resolving power of the first MTF curve in the range of distances.
4. The imaging zooming apparatus of claim 2 , further comprising a third lens having a third MTF curve that is different from the first and the second MTF curves, and wherein the imaging processor is further configured to generate the composite image based on the first, the second, and the third MTF curves.