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As Visual Background Extractor(Vibe)is sensitive to illumination change and object shadow and extracts movement area incompletely,this paper proposes a Vibe motion target detection algorithm based on Lab color space.For matching pixels with their background models,the algorithm improves CIE1976Lab color-difference formula by reducing the proportion of brightness difference.Experiments show that the improved color-difference formula is less sensitive to illumination change and object shadow.Then,the algorithm makes use of space consistency of pixels to correct pixel classification results,which improves the anti-noise ability and makes extracted movement area more complete.Experimental results demonstrate that the algorithm proposed has better detection effects both in indoor and outdoor environments.