Unluckily, they are quite ugly whereas blurring usually looks somewhat natural and less disturbing. Of course, black bars (or any other solid-color) overlay are more secure since they leave no information at all from which you could reconstruct or guess something. You can without any doubt still tell that it's the letters "AO" in either one.ĭepending on what the input is and on how much you blur, this means blurring may be completely safe, kind of safe, or not safe at all. It is impossible to reconstruct the image on the left from either one because the high-frequency information has been discarded. In this picture, two different convolutions are shown (a simple box filter and a gaussian filter, both with large radius). Textual information (such as your credit card number) may be retrieved without being able to restore the original image simply based on the fact that character shapes are so distinct. Step 1: Drag the video file on Track after importing, and then go to the fx tool and choose Blur. It is able to track the moving faces or objects and keep them blurring. Simply scaling down a blurred picture of sufficiently high resolution (or thresholding it, or increasing contrast, or squinting your eyes) will usually give a surprisingly good picture that is not as unrecognizable as you might wish. As its name said, PowerDirector is a powerful video editor to blur face in your video and protect your privacy. Worded differently, a "T" still produces a distinctly different "blob" than an "a" even if it is blurred beyond being readable, and while an "a" may produce the same blob as an "e", they are not equally likely to appear in the same context! However, it may be (usually is!) possible to restore a similar picture which has enough detail to be recognizable, and even if that is isn't possible, it may still be possible to derive sufficient information to be considered harmful, if the possible inputs are predictable enough. It is not possible to restore the original image from the blurred version,
Why blurring sensitive information is a bad ideaīlurring removes high-frequency detail from an image (by applying a convolution that is essentially a weighted average of some kind). See: Blurring Images Not So Secure, Can we technically un-blur images?, and The government doesn't blur sensitive papers, they use thick black lines to censor it.
Sure, a face might be nearly impossible, but why leave a chance? It's surprisingly easy to deconvolute an image now, and who knows what could happen in the future?įaces will probably be fine if you do it correctly (use your brain and don't just barely blur something), but for sensitive information just black it out. Remember, you want to leave your visitors with NO information, not blurred information. By adding a layer that can't just be removed, you've removed the possibility of somebody sorting the messed up information. Blurring essentially rounds and moves things around, and with the right algorithm for certain blurs information can be revealed. If you have a choice between blurring and blacking/whiting something out, go with the latter. You can't completely remove blur but you can definitely revert some of the changes.
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