As the false positive number of abnormal shadow candidacy detection times is controlled and detection precision improves, shortening in processing time of the abnormal shadow candidacy detection time is assured.According to the image processing device which relates to this invention, reducing the graphics data D of the field picture, it forms graphics data D1, applying the 1st smoothing filter vis-a-vis graphics data, D1 minuteness it forms the graphics data D2 where, the density territory is smoothed low puts the 2nd smoothing filter on graphics data D2 and it has the same size as the abnormal shadow candidacy territory which it should detect, the graphics data D3 where the density territory is smoothed low is formed, finite difference graphics data D4 is formed by taking the finite difference of pixel value of identical pixel position of graphics data D3 and graphics data D2,Graphics data D5 of the density which has the size of the detection object, by threshold processing this graphics data D4 territory is extracted low. It detects abnormal shadow candidacy and, vis-a-vis the territory where it is extracted with graphics data D5.
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