Material and shape perception based on two types of intensity gradient information
Fig 12
The angular difference between the judgments on tone-mapped and original images is plotted as a function of the amplitude of the sinusoidal modulation. Error bars indicate 95% confidence intervals computed using bootstrap estimates. Different symbols indicate different slopes as indicated in the legend. The orange (solid) horizontal line shows the mean angular difference of matched gauges for the same original object measured in different sessions (i.e., the control condition). Magenta (dashed) horizontal lines indicate 95% confidence intervals of the control condition computed using bootstrap estimates. For slope 1, the intensity order of the original image was disrupted when the sinusoidal modulation was 0.115 or 0.165. For slope 0.5, the intensity order was disrupted when the sinusoidal modulation was 0.065, 0.115 or 0.165. For slope 2, the modulations did not change the intensity order. Results show that the large deviations of the perceived shape were obtained when the intensity order of the original image was markedly disrupted.