The root mean square (abbreviated RMS or rms), additionally referred to as the quadratic mean, in statistics is astatistical measure outlined because the square root of the mean of the squares of a sample.

RMS can even be calculated for a endlessly variable function.

This measure is computed by the following formula:

RMS Error

where, N is the total number of pixels in the image, dc is the computed disparity map, and dt is the ground truth disparity map.