Image processing apparatus, electronic camera, scanner, and image processing method
First Claim
1. An image processing apparatus which calculates noise values based on signal levels of image signals and, reduces based on the noise values, the noise included in image signals which is output from a subject image sensor, comprising:
- a noise value output unit which, takes a certain image sensor as a baseline image sensor, stores correspondence relations between signal level values and noise values of output signals from the baseline image sensor, and outputs as first noise values the noise values of the baseline image sensor corresponding to signal level values of the image signals based on the correspondence relations; and
, a noise value correction unit which compensates the first noise values to obtain second noise values corresponding to the subject image sensor using a prescribed variable which relates the noise characteristics of the baseline image sensor and of the subject image sensor.
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Abstract
An image processing apparatus which calculates noise values based on signal levels of image signals and, reduces based on the noise values, the noise included in image signals which is output from a subject image sensor, including: a noise value output unit which, takes a certain image sensor as a baseline image sensor, stores correspondence relations between signal level values and noise values of output signals from the baseline image sensor, and outputs as first noise values the noise values of the baseline image sensor corresponding to signal level values of the image signals based on the correspondence relations; and, a noise value correction unit which compensates the first noise values to obtain second noise values corresponding to the subject image sensor using a prescribed variable which relates the noise characteristics of the baseline image sensor and of the subject image sensor.
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Citations
7 Claims
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1. An image processing apparatus which calculates noise values based on signal levels of image signals and, reduces based on the noise values, the noise included in image signals which is output from a subject image sensor, comprising:
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a noise value output unit which, takes a certain image sensor as a baseline image sensor, stores correspondence relations between signal level values and noise values of output signals from the baseline image sensor, and outputs as first noise values the noise values of the baseline image sensor corresponding to signal level values of the image signals based on the correspondence relations; and
,a noise value correction unit which compensates the first noise values to obtain second noise values corresponding to the subject image sensor using a prescribed variable which relates the noise characteristics of the baseline image sensor and of the subject image sensor. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An image processing method, in which noise values are calculated based on signal levels of the image signals, and the noise included in the image signals output from subject image sensor is reduced based on the noise values, comprising steps of:
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outputting, taking a certain image sensor as a baseline image sensor and storing correspondence relation between signal level values of output signals from the baseline image sensor and noise values, as first noise values the noise values of the baseline image sensor corresponding to the signal level values of the image signals based on the correspondence relation; and
correcting the first noise values to second noise values corresponding to the subject image sensor using a prescribed variable which relates the noise characteristics of the baseline image sensor and of the subject image sensor.
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Specification