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The real world coordinates for pixel [229, 182] can be calculated as
x = 229 * 0.05 = 11.45 (meters)
y = (512 - 182) * 0.05 = 16.5 (meters)
a = 0.0 , head to the right side of the map, or
1.57, head to the top side of the map, or
3.14, head to the left side of the map, or
-1.57, head to the down side of the map
Re-write initial_pose _x, initial_pose_y, and initial_pose_a with this
new [11.45, 16.5, 1.57], see following: