In this paper we propose noise cancelation methods for wearable devices which can be used for sight impair people. In the last decades, a variety of wearable devices have been developed to support blind people in their daily lives. These devices assist blind people to navigate to avoid obstacles while walking in both indoor and outdoor environments. The wearable devices have some reasonable requirements such as small sizes, light weight and low power consumption. They should work independently as personal-used devices. They also should work well as the users walk or run. These kinds of motion can cause many types of noises to the systems such as: camera motion, illumination changes. The proposed methods employing microprocessors reduce the effects of these noises. A real system is built and experimental results are provided to clarify the problems.