1. A method of detecting still pixels in a video stream having a plurality of fields including an early field having an early current pixel and a late field having a late current pixel, the method comprising: defining a first window of pixels of the late field with a noise reduction unit, wherein the first window includes the late current pixel; performing a first window still pixel test with the noise reduction unit using the pixels of the first window; by calculating a pixel pair difference for each pixel in the first window to generate a plurality of pixel pair differences; and comparing an absolute value of each pixel pair difference with a difference threshold, wherein the late current pixel fails the first window still pixel test when the absolute value of any pixel pair difference of the first window is greater than the difference threshold; defining a second window of pixels of the late field with the noise reduction unit, wherein the second window includes the late current pixel; and performing a second window still pixel test with the noise reduction unit using the pixels of the second window.