diff --git a/modules/photo/src/calibrate.cpp b/modules/photo/src/calibrate.cpp
index e9fb461f5b..eda3e1265b 100644
--- a/modules/photo/src/calibrate.cpp
+++ b/modules/photo/src/calibrate.cpp
@@ -89,7 +89,7 @@ public:
             int step_y = images[0].rows / y_points;
 
             for(int i = 0, x = step_x / 2; i < x_points; i++, x += step_x) {
-                for(int j = 0, y = step_y; j < y_points; j++, y += step_y) {
+                for(int j = 0, y = step_y / 2; j < y_points; j++, y += step_y) {
                     sample_points.push_back(Point(x, y));
                 }
             }