Post-processed bokeh rendering using asymmetric recursive Gaussian filters

摘要

#$%^&*AU2013273830A120150709.pdf#####POST-PROCESSED BOKEH RENDERING USING ASYMMETRIC RECURSIVE 5 GAUSSIAN FILTERS ABSTRACT A method of blurring an image using a spatially variable blur is disclosed. The method 10 comprises the steps of: for each pixel of a scan line of pixels in the image: obtaining a measure representative of image depth at the pixel; determining a blur kernel width for the pixel based on the measure representative of image depth at the pixel; and where an increase in the determined blur kernel width with respect to a blur kernel width of a previous pixel in the scan line is detected: determining, from the determined blur kernel width, a tapered blur width 15 adapted to provide an asymmetric filter response for the pixel; and applying the tapered blur width to a filter to output a blurred pixel value for the pixel by using a plurality of filter coefficients determined based on blur width values of one or more previously blurred pixels. R17rA77 1 pnQqnAn zni nripn1/14 110 120 y[n] = x[n] + a.y[n-1] x[n] P- y[n] , Iy[n-1] Fig. 1A 150 140 130 115 125 Y(z) 1 H(z) =-X(z) 1-az'Yz) X(z) -+ Y(z) ~-1 135 Fig. 1B