Creating Depth of Field Effects without Multiple Samples

We describe the depth of field A buffer, a new method for generating depth of field effects in synthesised images. The method avoids the use of multiple discrete samples but still has the capability to produce the effect of a sharp object viewed through a de-focussed one. Initial rendering can be done via a system producing pixel contributions together with depth information as required by conventional Z buffering. We present sample images illustrating the advantages of the technique compared to multi-sampling. We discuss the options for hardware-accelerated implementation and possible applications.