1. A method, comprising the steps of: computing a magnitude of a desired distortion, introduced into the frames of a video sequence with at least one of a watermarking process or a compression process; within each local spatiotemporal region of the video frames, counting a number of points that have an amplitude of information related to a feature of the regions that at least equal the computed imperceptible distortion magnitude; in each of the local spatiotemporal regions, computing a fraction of the points, which have feature information magnitudes that at least equal the computed imperceptible distortion magnitudes, in relation to the total number of points; comparing the computed fractions to a specified threshold value; and identifying one or more of the local spatiotemporal regions with fractions that equal or exceed the specified threshold value.