Content and Attention Aware Overlay for Online Video Advertising Figure 10. A snapshot of two side-by-side overlay ads. Left: an overlay ad using the font size obtained from Eqn. 9; Right: an overlay ad using a fixed font size provided by UI experts in designing stage. Us- ers are asked to compare these two ads Figure 11. Evaluation on the ad-template compatibility. Each bar gives a percentage of the comparison pairs that are marked by users as: algorithm selection is better (A>F), fixed selection is better (A<F), or tie (A=F)