1. A video noise reduction method using adaptive spatial and motion-compensation temporal filters, the method comprising: calculating a mean of a plurality of pixels of a motion window; calculating a pixel amount of pixels that are similar to a center pixel in the motion window; calculating a variance of the plurality of pixels of the motion window; determining whether a difference between a pixel value of the center pixel and the mean is greater than a first predetermined value; determining whether the pixel amount of pixels that are similar to the center pixel in the motion window is greater than a second predetermined value if the difference between the pixel value of the center pixel and the mean is not greater than the first predetermined value; determining whether the variance is smaller than a threshold value if the pixel amount of pixels that are similar to the center pixel in the motion window is not greater than the second predetermined value; filtering the center pixel of the motion window according to a result of determining whether the variance is smaller than the threshold value; and using a temporal weighted mean filter involving motion estimation for motion compensation in images.