Method of reducing flicker noises of X-Y address type solid-state image pickup device
First Claim
1. A method of reducing flicker noises attributable to the emission frequency of illumination light generated in an X-Y address type image pickup device having a plurality of pixels for performing photoelectric conversion of incident light in a predetermined signal storage time and outputting image data, the method comprising the steps of:
- calculating average luminance of the image data for each frame in a predetermined average luminance detection area allocated in the frame;
calculating a difference in the average luminance between frames; and
changing the signal storage time based on the difference in luminance.
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Abstract
It is an object of the invention to provide a method of reducing flicker noises in an X-Y address type solid-state image pickup device for reducing flicker noises generated by a fluorescent light for room illumination when taking a picture in door.
A configuration is provided in which signal storage time ts resulting in no flicker noise under a fluorescent lamp having an emission frequency of 120 Hz is preset (step S1); average luminance of image data is calculated for each frame in a predetermined average luminance detection area allocated in the frame (step S2); a difference in average luminance is calculated between frames (step S3); and the signal storage time ts is changed based on the difference in luminance (steps S4, S5 and S6).
100 Citations
14 Claims
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1. A method of reducing flicker noises attributable to the emission frequency of illumination light generated in an X-Y address type image pickup device having a plurality of pixels for performing photoelectric conversion of incident light in a predetermined signal storage time and outputting image data, the method comprising the steps of:
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calculating average luminance of the image data for each frame in a predetermined average luminance detection area allocated in the frame;
calculating a difference in the average luminance between frames; and
changing the signal storage time based on the difference in luminance. - View Dependent Claims (2, 3, 4, 5, 10, 11, 12, 14)
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6. A method of reducing flicker noises attributable to the emission frequency of illumination light generated in an X-Y address type image pickup device having a plurality of pixels for performing photoelectric conversion of incident light in a predetermined signal storage time and outputting image data, the method comprising the steps of:
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providing two average luminance detection areas in each frame and calculating average luminance of the image data in the two average luminance detecting areas of a plurality of frames;
performing a sum-of-product calculating process on the plurality of values of average luminance to calculate a sum of products; and
changing the signal storage time based on the sum of products. - View Dependent Claims (7, 8, 9, 13)
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Specification