Image sensing apparatus and correction method
AssigneeCanon Kabushiki Kaisha
InventorKoji Oshima
Life of this patent
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Abstract
An image sensing apparatus includes an image sensing device having a plurality of pixels, a smoothing unit that smoothes a dark image signal acquired with the image sensing device shielded from light; a subtraction unit that subtracts a second dark image signal from the dark image signal; an extraction unit that extracts, as a defective pixel of the image sensing device, a pixel of which an obtained difference is outside a preset range; and a correction unit that corrects, out of subject image signals output from the image sensing device, an image signal of the defective pixel extracted by the extracting unit, using an image signal of a pixel peripheral to the defective pixel.
Claims14
An image sensing apparatus comprising:
- an image sensing device that has a plurality of pixels;
- a smoothing unit that smoothes a dark image signal acquired with said image sensing device shielded from light and generates a corrected dark image signal;
- a dark correction unit that performs dark correction on an object image signal acquired by sensing an object by said image sensing device by subtracting the corrected dark image signal from the object image signal;
- an extraction unit that extracts, as a defective pixel of said image sensing device, a pixel of which an obtained difference is outside a preset range by subtracting the smoothed corrected dark image signal from the dark image signal;
- and
- a defective pixel correction unit that corrects an image signal output from the defective pixel using an image signal output from a pixel peripheral to the defective pixel.
A correction method for correcting an image signal output from an image sensing device that has a plurality of pixels, said method comprising:
- a image sensing step of acquiring an object image signal by sensing an object;
- a second image sensing step of acquiring a dark image signal by performing image sensing with said image sensing device shielded from light;
- a smoothing step of smoothing the dark image signal acquired in said second image sensing step and generating a corrected dark image signal;
- a dark correction step of performing dark correction on the object image signal acquired in said image sensing step by subtracting the corrected dark image signal from the object image signal;
- an extraction step of extracting, as a defective pixel of the image sensing device, a pixel of which an obtained difference is outside a preset range by subtracting the corrected dark image signal from the dark image signal;
- and
- a defective pixel correction step of correcting an image signal output from the extracted defective pixel using an image signal output from a pixel peripheral to the defective pixel.
Dependencies are inferred from the claim text.