Method and system for detecting flicker
First Claim
Patent Images
1. An image processing system comprising:
- a plurality of active pixels to output active pixel signals at a first readout frequency;
a plurality of flicker pixels to output flicker pixel signals at a second readout frequency greater than the first readout frequency;
a plurality of frequency detectors to accumulate the flicker pixel signals and to perform frequency domain transformation of the accumulated flicker pixel signals; and
a frequency analyzer to detect flicker by analyzing the flicker pixel signals transformed into the frequency domain, wherein each of the frequency detectors is to;
detect a dominant frequency among the flicker pixel signals transformed into the frequency domain, andcalculate a confidence value indicating how the dominant frequency is different from remaining frequencies of the flicker pixel signals transformed into the frequency domain, the frequency analyzer to detect flicker based on the confidence value to be calculated by each of the frequency detectors.
1 Assignment
0 Petitions
Accused Products
Abstract
An image processing system includes a plurality of active pixels and a plurality of flicker pixels. The active pixels output active pixel signals at a first readout frequency, and the flicker pixels output flicker pixel signals at a second readout frequency greater than the first readout frequency. A plurality of frequency detectors accumulate the flicker pixel signals and then perform frequency domain transformation of the accumulated flicker pixel signals. A frequency analyzer detects flicker by analyzing the flicker pixel signals which have been transformed into the frequency domain.
37 Citations
11 Claims
-
1. An image processing system comprising:
-
a plurality of active pixels to output active pixel signals at a first readout frequency; a plurality of flicker pixels to output flicker pixel signals at a second readout frequency greater than the first readout frequency; a plurality of frequency detectors to accumulate the flicker pixel signals and to perform frequency domain transformation of the accumulated flicker pixel signals; and a frequency analyzer to detect flicker by analyzing the flicker pixel signals transformed into the frequency domain, wherein each of the frequency detectors is to; detect a dominant frequency among the flicker pixel signals transformed into the frequency domain, and calculate a confidence value indicating how the dominant frequency is different from remaining frequencies of the flicker pixel signals transformed into the frequency domain, the frequency analyzer to detect flicker based on the confidence value to be calculated by each of the frequency detectors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 10, 11)
-
-
8. A method for detecting flicker in an image processing system, the method comprising:
-
accumulating flicker pixel signals output from flicker pixels; performing frequency domain transformation for the accumulated flicker pixel signals; detecting a dominant frequency among the flicker pixel signals transformed into the frequency domain; calculating a confidence value indicating how the dominant frequency is different from remaining frequencies of the flicker pixel signals transformed into frequency domain; and detecting flicker based on the confidence value for the flicker pixel signals transformed into the frequency domain, wherein the active pixels output active pixel signals at a first readout frequency, and the flicker pixels output the flicker pixel signals at a second readout frequency greater than the first readout frequency. - View Dependent Claims (9)
-
Specification