Design and Accuracy of an Instrumented Insole Using Pressure Sensors for Step Count

. 2019 Feb 26;19(5):984. doi: 10.3390/s19050984

Algorithm 1: A step count algorithm using cumulative sum of all pressure signals.

1:   Input: N channels pressure P_i (t),
2:   Calculate the sum pressure P_sum (t);
3:   Calculate the cumulative sum pressure P_{cum_sum} (t);
4:   Initial: N_peak = step count = 0; A = 0; B = 0;
5:   For j = 1 : M do
6:           if P_heel ≥ 50% of P_{i max} then
7:                   A = Calculate P_{cum_sum} (t);
8:           else
9:               B = Calculate P_sum (t);
10:         end
11:         if (A != 0 && B != 0) then
12:           Step count = N_peak + 1 = step count + 1;
13:             A = 0; B = 0;
14:         else
15:             Step count = N_peak = step count;
16:         end
17: end
18: Return: step count.