This paper proposes the adaptive directional filter

which is exploited for the extrac ting of left ventricular (LV) contour. This algorithm could produce the exact ridge point by applying directional filter with smoothing operator in the angiography images damaged by noise. The Edge Directional Vector as the result of this filter is efficient for predicting the edge ahead

while the filter parameters is adaptive. This proposed method provides the more precise and more automatic -extracting LV contour only with fewer interactives. The experimental results show that this proposed algorithm could improve the accuracy and reproducibility

and reduce the computational consumption remarkably.