Patent ID: 7538799
Filing Date: 2009-05-26
Classification: H04N

Abstract:
1. A method of detecting flicker in a digital camera, the method comprising the steps of: receiving image data, the image data including a plurality of pixels arranged in a plurality of rows; performing a first weighted sum of pixel luminance in a first plurality of columns defined in the image data using a first pattern of alternating sign weights with a summation mechanism, where the performing of the first weighted sum comprises multiplying each of a first plurality of pixels in the first plurality of columns with either a positive sign weight from the first pattern of alternating sign weights or a negative sign weight from the first pattern of alternating sign weights depending on the pixel's row position in the first pattern of alternating sign weights; performing a second weighted sum of pixel luminance in a second plurality of columns defined in the image data using a second pattern of alternating sign weights with the summation mechanism, where the performing of the second weighted sum comprises multiplying each of a second plurality of pixels in the second plurality of columns with either a positive sign weight from the second pattern of alternating sign weights or a negative sign weight from the second pattern of alternating sign weights depending on the pixel's row position in the second pattern of alternating sign weight; and comparing the first weighted sum of pixel luminance and the second weighted sum of pixel luminance with a comparator to determine if flicker is present in the image data.