about feature flow

[1287953547]

Dr. Nie, I would like to ask why there is one mod W and one //W in the formula for predicting the horizontal and vertical motions value of feature flow. In addition, does the formula have a more specific description, some seem to understand but not understand, thank you

[nie-lang]

Please note that k is a 1D index ranging from 1 to HW, thus mod W and //W represent the corresponding 2D coordinates. A detailed explanation can be found in the following image:

[1287953547]

Please note that k is a 1D index ranging from 1 to HW, thus mod W and //W represent the corresponding 2D coordinates. A detailed explanation can be found in the following image:

thanks