US 7,460,728 B2 · Image processing apparatus and method, recording medium, and program

Abstract

For each pixel read from an imaging device, a horizontal counter value and a vertical counter value corresponding to the pixel are supplied from a signal generator to a distance computation section via an optical-axis-center coordinate setting section and an up-and-down and right-and-left weighting section. In the distance computation section, the distance to the optical-axis center is computed, and correction coefficients for the zoom wide end and for the zoom tele end, which correspond to the distance, are obtained by look-up tables. The two obtained correction coefficients are blended at a mixture ratio determined by a blend ratio setting section. The blended shading correction coefficients are gain adjusted by a gain adjustment section, after which they are supplied to a correction section. As a result, a correction corresponding to the distance to the optical-axis-center position is performed on the signal of each pixel supplied from an imaging section.

Claims16

Dependent claims

An image processing apparatus for correcting shading of a captured image, the image processing apparatus comprising:

a first distance computation section configured to compute a first distance from an image-plane center to each pixel by multiplying a measured distance by a distance gain;
an obtaining section configured to obtain a plurality of correction values for each pixel for correcting the shading of the image based on the first distance computed by the first distance computation section;
a mixture-ratio setting section configured to set a mixture-ratio of the plurality of correction values for each pixel obtained by the obtaining section;
a mixing section configured to mix the plurality of correction values for each pixel to determine a final correction value for each pixel, based on the mixture-ratio set by the mixture-ratio setting section;
and
a correction section configured to correct the signal of each pixel based on the final correction value determined by the mixing section.

3 more elements

An image processing method for use with an image processing apparatus configured to correct shading of a captured image, the image processing method comprising:

computing a first distance from an image-plane center to each pixel by multiplying a measured distance by a distance gain;
obtaining a plurality of correction values for each pixel for correcting the shading of the captured image based on the first distance computed in the computing;
setting a mixture-ratio of the plurality of correction values for each pixel obtained by the obtaining;
mixing the plurality of correction values for each pixel to determine a final correction value for each pixel, based on the mixture-ratio setting set by the setting;
and
correcting the signal of each pixel based on the final correction value determined by the mixing.

3 more elements

A recording medium having recorded thereon a computer-readable program executable to perform image processing of an image processing apparatus for correcting shading of a captured image, the program comprising:

computing a first distance from an image-plane center to each pixel by multiplying a measured distance by a distance gain;
obtaining a plurality of correction values for each pixel for correcting the shading of the captured image based on the first distance computed in the computing;
setting a mixture-ratio of the plurality of correction values for each pixel obtained by the obtaining;
mixing the plurality of correction values for each pixel to determine a final correction value for each pixel, based on the mixture-ratio set by the setting;
and
correcting the signal of each pixel based on the final correction value determined by the mixing.

3 more elements

An image processing apparatus for correcting shading of a captured image, wherein the image processing apparatus comprises:

first distance computation means for computing a first distance from an image-plane center to each pixel by multiplying a measured distance by a distance gain;
obtaining means for obtaining a plurality of correction values for each pixel for correcting the shading of the image based on the first distance computed by the first distance computation means;
mixture-ratio setting means for setting a mixture-ratio of the plurality of correction values for each pixel obtained by the obtaining means;
mixing means for mixing the plurality of correction values for each pixel to determine a final correction value for each pixel, based on the mixture-ratio set by the mixture-ratio setting means;
and
correction means for correcting the signal of each pixel based on the final correction value determined by the mixing means.

3 more elements

Dependencies are inferred from the claim text.

Image processing apparatus and method, recording medium, and program

Life of this patent

Image processing apparatus and method, recording medium, and program

Life of this patent

Abstract

Claims16