realsense SR300 detect object much closer

i use SR300 on my robot for obstacle avoidance my ros is indigo and use [official package](http://wiki.ros.org/realsense_camera) for the camera i put the robot afront of a wall, at first the camera detect the wall just as my lidar detected, the distance are almost the same  but waite a little longer time , the camera detect the wall much closer than the lidar detected, as show below  after i restart the launch file, it works fine again. **by the way i keep all the parameters as default** much thanks anyone can help