US 7,443,430 B2Granted

Image sensing apparatus and method for correcting signal from image sensing device by using signal correction amount

AssigneeCanon Kabushiki Kaisha

InventorsHideyuki Rengakuji, Toshikazu Yanai

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Abstract

In an image sensing apparatus which uses a solid-state image sensing device, it is an object of the present invention to minimize smear. In order to achieve the object, a solid-state image sensing apparatus includes a solid-state image sensing device, a calculation unit which calculates a signal correction amount from an output signal from the solid-state image sensing device, an indication unit (even_odd_flag) which indicates whether the above output signal is output from an even-numbered line or odd-numbered line of the solid-state image sensing deice, the first correction unit which corrects the signal correction amount in accordance with the output from this indication unit, and the first subtraction unit which subtracts, from the above output signal, the signal correction amount corrected by the first correction unit.

Claims8

Dependent claims

An image sensing apparatus, comprising

a plurality of photo diodes arrayed on one line which include a first block consisting of a plurality of photo diodes that include first color diodes and second color diodes, and a second block consisting of a plurality of photo diodes that include the first color diodes and the second color diodes and whose number is different from a number of photo diodes in the first block;
a shift register to which signals of said plurality of photo diodes arrayed on one line are transferred;
a control circuit which transfers signals of the first color diodes in the first block to said shift register and transfers signals of the second color diodes in the second block to said shift register;
and
a correction circuit which applies different correction amounts to the signals of the first color diodes transferred to said shift register and the signals of the second color diodes transferred to said shift register on the basis of a ratio of a number of photo diodes in the first block to a number of photo diodes in the second block.

2 more elements

An image sensing apparatus comprising;

a plurality of photo diodes arrayed on one line which include a first block consisting of a plurality of photo diodes and a second block consisting of a plurality of photo diodes;
a shift register to which signals of said plurality of photo diodes arrayed on one line are transferred;
a control circuit which transfers signals of a first photo diodes included in a part of the first block to said shift register and transfers signals of a second photo diodes included in a part of the second block to said shift register;
and
a correction circuit which corrects a noise amount,
wherein said correction circuit applies different correction amounts, which are obtained by multiplying different variables to the noise amount, for the signals transferred from the first photo diodes to said shift register and the signals transferred from the second photo diodes to said shift register on the basis of a ratio of a number of the first photo diodes to a number of all photo diodes in the first block and a ratio of a number of the second photo diodes to a number of all photo diodes in the second block.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/957,508Filed 1 Oct 2004
Priority: JP 2003-3443732 Oct 2003
Published: US 2005/0073597 A17 Apr 2005
Granted: 28 Oct 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

H04N 25/625
Detection or reduction of noise due to excess charges produced by the exposure, e.g. smear, blooming, ghost image, crosstalk or leakage between…
H04N 25/445
By partially reading an SSIS array: by skipping some contiguous pixels within the read portion of the array
H04N 25/71
SSIS architectures; Circuits associated therewith: charge-coupled device [CCD] sensors; Charge-transfer registers specially adapted for CCD sensors
H04N 25/73
Charge-coupled device [CCD] sensors; Charge-transfer registers specially adapted for CCD sensors: using interline transfer [IT]