Cinematic Bokeh rendering for real scenes

Geometric Scene Refocusing

“…Tang and Kutulakos [33] describe an analytical approach for blind image deblurring and PSF calibration at other pixels from known PSFs at some pixels. Hach et al [34] show a dense calibration method for a high quality lens with depth-aware rendering to produce synthetic bokeh. In this work, we present a simple calibration method that estimates the size and shape of defocus kernels using the estimated in-focus pixels.…”

“…Pixel that contribute to bokeh circles need to be identified to simulate accurate geometric refocusing of the scene. Drawing inspiration from existing methods such as [22], [29], [34], we identify bokeh-causing pixels as those which have an intensity larger than a threshold t B and do not change their intensity across focal slices:…”

“…We use geometric calibration to compute the defocus kernels by iterating across equi-focal pixels in a piece-wise manner. We estimate the size and the variable shape of defocus kernels similar to approaches such as [31], [32], [34]. The σ of the blur kernel depends on the distance between the current focus position and the pixel's in-focus position and the shape of the kernel depends on the location of the pixel on the sensor.…”

“…Background textural details becoming apparent through a blurred foreground is clearly visible using our approach. c) Comparison of Bokeh Quality: Hach et al [34] render bokeh highlights using precise modeling and reconstruction of the PSF for a high-quality camera. They tediously calibrate an RGBD camera and learn the distribution of PSFs in order to simulate DoF effects in a post-capture manner.…”

“…We then blur the in-focus pixels from one slice with several candidate size and shape parameters and compare the blurred images with the other slice to compute the best match. The shapes are chosen from a set of shapes motivated by [34] and shown in Figure 8. The defocus kernel between a pair of focal slices is computed in a bidirectional manner and the size and shape parameters are recorded for both directions.…”