Zoom algorithm

摘要

Methods to zoom a region of interest from a digital image have been achieved. The methods invented support according to the scale of zooming the decrease or the increase of the resolution of digital images. The region of interest to be zoomed is variable; the destination image has a fixed size. In case of a decrease of the resolution of the region of interest the method invented combines interpolating source pixels to calculate the color values of the destination pixels and omitting some rows of source pixels. In case of enlargement the method invented combines interpolation of the source pixels to calculate the color values of the destination pixels, extrapolation of the destination pixels being close to the edge of the image, and replication of some of the interpolated rows of the destination image to gain additional rows according to the scale of the increase of resolution (enlargement) of a digital image.

主权项

1. A method to zoom a region of interest from a id="REI-00001" date="20140701" digitalid="REI-00001" source image, wherein a resolution of the region of interest is either id="REI-00002" date="20140701" decimatedid="REI-00002" id="REI-00003" date="20140701" reduced id="REI-00003" or enlarged to fit into a destination image, comprising:
providing a digital camera to implement the following steps: (1) definedefining, with a digital camera, a size and a location of saidthe region of interest as part of saidthe source image; (2) calculate scale of conversion in x- and y-direction; (3) calculate number of rows of pixels of said destination image according to scale of conversion desired in y-direction; (4) calculate number of pixels contained in a row of pixels of said destination image according to scale of conversion desired in x-direction; (5) calculateinterpolating, with the digital camera, multiple pixels in the source image to generate color values of each pixel along the rows of pixels of the destination image by interpolation from nearest row of pixels of said source image wherein the color values of the pixels of the destination image being locatedcorresponding to locations within the region of interest in the source image; replicating, with the digital camera, a first, or correspondingly a last, pixel of a nearest row in the source image for use as color values of pixels in the destination image corresponding to locations between the left side edge of the source image and thea first pixel of the nearest row of pixels of the region of interest of the source image and the color values of the pixels of the destination image being located between the right side edge of the source image and thea last pixel of the nearest row of the source image are achieved by replicating the color values of said first, or correspondingly said last, pixel of the nearest row of the source image; and (6) displaydisplaying, with the digital camera, the zoomed region of interest in saidthe destination image.