Existing methods for image data fusion are not quite satisfactory for object detection. To improve the resolution of target and suppress the detection noise of each sensor, a new method for image data fusion based on wavelet transform is presented. By decomposing the image with wavelet transform, wavelet coefficients and approximation coefficients at different scales are obtained. We took those coefficients with larger absolute value in\|between the multiresolution images as the important wavelet coefficien...