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Old 01-25-2009, 08:03 PM
 
Location: Texas
5,070 posts, read 8,764,604 times
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I see these FBI shows and some police shows where they may have video or still digital pictures of something of interest, and they somehow enhance them so detail is sharper. Is this exaggerated or is it a commonly used tool? or both? Why get a super-dooper expensive digital camera if you can take pics the cheap camera and make them ten times better?
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Old 01-25-2009, 08:10 PM
 
733 posts, read 1,683,950 times
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Quote:
Originally Posted by Brian.Pearson View Post
I see these FBI shows and some police shows where they may have video or still digital pictures of something of interest, and they somehow enhance them so detail is sharper. Is this exaggerated or is it a commonly used tool? or both? Why get a super-dooper expensive digital camera if you can take pics the cheap camera and make them ten times better?
why are you a criminal??? lol....... just kidding.....
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Old 01-25-2009, 08:47 PM
 
Location: US
1,189 posts, read 3,551,547 times
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The cop show image enhancement is BS. Mostly for the reason you said. "Why get a super-dooper expensive digital camera if you can take pics the cheap camera and make them ten times better?" If its shot with crap you are going to get crap. Yeah with video you may be able to take a couple good frames and interpolate them to maybe get something easier on the eyes or run it though some filters, but...crap in -> crap out.
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Old 01-25-2009, 08:50 PM
 
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For the most part what you see is bogus and some of it borders on hilarious especially where video is concerned. You cannot create what is not there. an image or video only contains so much information. For example this is from standard DV cam but a prosumer model that can utilize much more of the avaiable resolution of DV, it shoots a 720X480 which equates to a .35 megapixel image. the decimal point is not misplaced.



If we zoom in on the singers face 1200% we'll find this:




As you can see we just have a bunch of sqaure pixels, there is no information there if for example we wanted to see what color his eyes were. It's all not all bogus, you can certainly enhance what information is avaialble to make certain features standout but overall what you see on TV is a fantasy.
Attached Thumbnails
Curious about photo enhancement-enlarged.jpg  
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Old 01-25-2009, 09:06 PM
 
Location: Texas
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Ha! I had a hunch, but I really wanted to know if such a thing existed.
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Old 01-25-2009, 09:08 PM
 
Location: Not far from Fairbanks, AK
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Yes, it is true. There is software specifically created to sort of "connect the dots." A knowledgeable programmer can create the algorithms to do exactly that. However, it can only work with an image that shows enough detail, because it can't make "details" where there are none. For example, it the photo shows the person's eyes or nose, it can enhance these, but not the rest. For example, it can't show your face if the photo is of the back of your head.

If it's a high resolution photo where the persons face is in the dark, it's very possible for one to load the photo to your computer, lasso the face with the lasso tool of PhotoShop, and then remove most of the darkness over the face, which in turn shows a lot of the face's details. You can do this at home.

In some places overseas (London, for example), if the police wants to check to see if you are in their "terrorist" list, your photo, which is being taken by the cameras on the streets, can be fed to a computer for a face analysis and recognition, and compared to the database of faces they already have in the computer. This is not enhancement, just recognition.

http://www.policeone.com/patrol-issu...ke-job-easier/

Last edited by RayinAK; 01-25-2009 at 09:17 PM..
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Old 01-25-2009, 09:21 PM
 
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Just so it's clear that last image I posted may misrepresent what can be done. There are filters and specific programs that do exceptionally well when scaling images and enhancing details. With some good software you could bring out some decent facial features from that frame of video but again you're not going to see what color his eyes are.
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Old 01-25-2009, 09:30 PM
 
37,069 posts, read 38,262,371 times
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Quote:
Originally Posted by RayinAK View Post
In some places overseas (London, for example), if the police wants to check to see if you are in their "terrorist" list, your photo, which is being taken by the cameras on the streets, can be fed to a computer for a face analysis and recognition, and compared to the database of faces they already have in the computer. This is not enhancement, just recognition.
That works through the geometry of your face. It looks for key points such as the distance your eyes are apart and other features like your nose and lips. It maps these points then tries to find a match for the points.
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Old 01-25-2009, 09:58 PM
 
Location: Not far from Fairbanks, AK
16,167 posts, read 27,421,913 times
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Quote:
Originally Posted by thecoalman View Post
That works through the geometry of your face. It looks for key points such as the distance your eyes are apart and other features like your nose and lips. It maps these points then tries to find a match for the points.
Yes, that's true. This software does not enhance, just matches details on a person's face against the faces on the database.

However, enhancing software does exist. It's not readily available because it's very expensive. The right computer must be used for it, which brings the cost much higher. But those police forces that can afford it and are authorized to use it, can very well do so.
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Old 01-26-2009, 08:19 AM
 
Location: Texas
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I imagine a police department who needed help with images could send it to another place that did for a fee. Otherwise it would be sitting idle.
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