Real-Time Blur Algorithms: From Box Blur to Dual Kawase Blur

This article details the evolution of real-time blur algorithms, from the simple Box Blur to the efficient Dual Kawase Blur. Using interactive WebGL demos, the author progressively explains Box Blur, Gaussian Blur, Separable Gaussian Blur, Kawase Blur, and finally the Dual Kawase Blur, analyzing the strengths and weaknesses and performance of each. The article also explores frequency-domain image processing and downsampling techniques in blur algorithms, and how to optimize GPU performance. Ultimately, the author champions the Dual Kawase Blur as a fundamental building block for real-time visual effects due to its balance of performance, stability, and visual quality.