Example shear filter functions , for filter and PSF size w = 3, p = 2, (κ = 0). Integrating an image multiplied with the filter function for a particular shear (g1,g2) yields the weighted second moments the image would have had if it had been sheared by that amount before seeing convolution. The central box is 25 units on a side, and the dashed line indicates the maximum shear value that can be applied for the given w and p (see Eq. (18)). Red is positive, blue is negative. Left: filters corresponding to Qxx−Qyy. Right: filters corresponding to Qxy.
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