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US 8,508,630 B2Granted
Electronic camera
AssigneeNikon Corporation
InventorKazuya Umeyama
Life of this patent
Estimating the term…
Abstract
An electronic camera includes: an image sensor having a charge transfer unit that transfers an electric charge for each pixel column; a correction unit that corrects an electric charge signal outputted from the charge transfer unit using a correction coefficient; and a control unit that controls the correction unit so that the correction coefficient is different according to operational conditions of the image sensor.
Claims15
An electronic camera, comprising:
- an image sensor having pixel columns and a charge transfer unit that transfers an electric charge for each of the pixel columns;
- a correction unit that obtains a leakage charge signal for each of the pixel columns and corrects an electric charge signal outputted from the charge transfer unit by subtracting an amount, resulting from multiplying a value of the leakage charge signal by a correction coefficient, from a value of the electric signal;
- a control unit that controls the correction unit;
- and
- an actuation member that generates a first signal that commands a start of photography using the image sensor, and a second signal before the start of photography is commanded, wherein
- the control unit controls the correction unit to use a first correction coefficient before the second signal is generated and to use a second correction coefficient different from the first correction coefficient after the second signal is generated, when multiplying the value of the leakage charge signal.
3 more elements
An electronic camera comprising:
- an image sensor having pixel columns and a charge transfer unit that transfers an electric charge for each of the pixel columns;
- a correction unit that obtains a leakage charge signal for each of the pixel columns and corrects an electric charge signal outputted from the charge transfer unit by subtracting an amount, resulting from multiplying a value of the leakage charge signal by a correction coefficient, from a value of the electric charge signal;
- a signal supply unit that supplies a clock signal to be used to generate a drive signal for making the image sensor accumulate electric charge and for discharging the accumulated electric charge, and makes a frequency of the clock signal variable;
- a control unit that controls the correction unit so as to make the correction coefficient vary according to the frequency of the clock signal supplied by the signal supply unit, wherein
- the control unit controls the correction unit to use a first correction coefficient if the clock signal has a first frequency and to use a second correction coefficient different from the first correction coefficient if the clock signal has a second frequency different from the first frequency, when multiplying the value of the leakage charge signal.
2 more elements
A smearing correction method with an electronic camera, comprising:
- obtaining an electric charge signal that is outputted from an image sensor and is used for displaying a monitor image upon a display unit that is provided to the electronic camera;
- determining whether or not a shutter release button has already been half press actuated;
- subtracting a first smearing correction amount from a value of the obtained electric charge signal and using the electric charge signal having been subtracted the first smearing correction amount for displaying the monitor image, when determining that the shutter release button has not been half press actuated;
- and
- subtracting a second smearing correction amount, which is different from the first smearing correction amount, from a value of the obtained electric charge signal and using the electric charge signal having been subtracted the second smearing correction amount for displaying the monitor image, when determining that the shutter release button has already been half press actuated.
2 more elements
Dependencies are inferred from the claim text.