US 8,412,002 B2Granted

Method for generating all-in-focus image

AssigneeAltek Corporation

InventorsShih-Yuan Peng, Chung-Ta Wu

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Abstract

A method for generating an all-in-focus image is provided. In the method, a plurality of frames including one source frame and several reference frames captured at different focus lengths are obtained. After performing a motion compensation procedure on the frames, for each pixel position belonging to an edge, a characteristic similarity between the source frame and each reference frame is calculated respectively to accordingly select a plurality of qualified reference frames among the reference frames. The method further includes determining a first type color space component of the pixel position within an all-in-focus image by an edge sharpness corresponding to the pixel position within each of the source frame and the qualified reference frames, and determining a second type color space component of the pixel position within the all-in-focus image by an color brightness corresponding to the pixel position within each of the source frame and the qualified reference frames.

Claims10

Dependent claims

A method for generating an all-in-focus image, for an image capturing device, the method comprising:

obtaining a plurality of frames captured at a plurality of focal lengths, wherein the frames comprise a source frame and a plurality of reference frames;
performing a motion compensation procedure on the frames;
performing an edge detection procedure on the frames to determine whether each of pixel positions in the frames belongs to an edge;
and
for each of the pixel positions belonging to the edge, performing the steps of:
calculating a characteristic similarity between the pixel position within the source frame and the pixel position within each of the reference frames;
according to the characteristic similarities respectively corresponding to the reference frames, selecting a plurality of qualified reference frames among the reference frames;
according to an edge sharpness corresponding to the pixel position within each of the source frame and the qualified reference frames, determining a first type color space component of the pixel position within an all-in-focus image;
and
according to a color brightness corresponding to the pixel position within each of the source frame and the qualified reference frames, determining a second type color space component of the pixel position within the all-in-focus image.

7 more elements

Dependencies are inferred from the claim text.