ziba gandomkar - University of tehran School of ECE, College of Engineering
fariba bahrami - University of tehran CIPCE, School of ECE, College of engireeng

In this article a markerless vision based technique for extracting a set of features fromhuman walking sequence for diffreniating normal and abnormal gait is presented. Gait change is an indicator in many diseases. Clinical gait assessment tools were proposed to asses ones gait but the result of these tools depend on raters opinion. consequently, quantitative gait assessment tool are proposed. However these tools are not preferable among clinicians since they are expensive and interfere with ones normal gait pattern. This paper presrnts a simple, inexpensive, and effectiv system for extracting features from gait to distinguish abnormal gait from normal one. For classifying the normal and abnormal gait from normal one . for classifying the normal and abnormal gait , first the silhouette and its bounding box are extracted in each frame.then, the height of silhouette of different subjects is normalized. in the next step, the patterns obtained from different subject are aligned temporally. these steps followed by tile extraction phase. finally features are extracted from the gait frieze pattern. the method is eveluated by using for classifying 64 wailking sequence (8 normal, 56 abnormal) to 8 different gait patterns. The result are shown thet the method is able to determinethe abnormal gait pattern with acceptable CCR.

markerless gait analysis; abnormal gait detection; gait frieze pattern; gait signature