Author Topic: Can ordinary humans enhance blurry pictures yet ?  (Read 4776 times)

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Offline antenna

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Re: Can ordinary humans enhance blurry pictures yet ?
« Reply #25 on: March 08, 2021, 04:54:29 pm »
The only way to add information and reduce noise in a photo is it have multiple frames from the same perspective (of an unmoved object, like a guy on a security camera that stood still for 12 frames) and average them such that the random noise cancels and the similar information reinforces itself. Image enhancements other than adding information also exist, but those are based of manipulating the existing data, for example, using mathematical convolution masks.

 
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Offline Someone

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Re: Can ordinary humans enhance blurry pictures yet ?
« Reply #26 on: March 08, 2021, 10:17:08 pm »
We are not yet seeing sound being picked out of the image...  I'm looking forward to the live demonstration!   :D
It has been demonstrated, there is nothing preventing these methods being done live (other than funding/development effort):


The only way to add information and reduce noise in a photo is it have multiple frames from the same perspective (of an unmoved object, like a guy on a security camera that stood still for 12 frames) and average them such that the random noise cancels and the similar information reinforces itself.
It certainly does not require multiple images of a still/unmoved object. Reconstruction from multiple perspectives/moving scene is usually superior. Some of the details are in the above video, but "enhance" from moving objects has been the traditional use case.
 

Offline cdev

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Re: Can ordinary humans enhance blurry pictures yet ?
« Reply #27 on: March 08, 2021, 10:33:56 pm »
Inverse methods or finite element analysis is what is used. If you search on those keywords you'll find a lot of stuff.

I'm pretty sure.
« Last Edit: March 08, 2021, 10:38:12 pm by cdev »
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Offline cdev

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Re: Can ordinary humans enhance blurry pictures yet ?
« Reply #28 on: March 08, 2021, 11:39:22 pm »
It depends on what one wants to enhance. one needs a modern GPU with Cuda for many of the AI video enhancement processing tools.
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Offline CatalinaWOW

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Re: Can ordinary humans enhance blurry pictures yet ?
« Reply #29 on: March 09, 2021, 12:17:59 am »
The original posters problem, improving resolution of a single static image has some limited possibilities.  As mentioned earlier various contrast enhancement techniques can improve the interpretability of the image.   Since best results are somewhat subjective best results are usually a trial and error process rather than algorithmic.  All of the big image processing programs have ways to manipulate the brightness histogram, usually in a variety of non-linear ways and also analogous to old darkroom dodging and burning in processes these changes can be varied over the image.

If the characteristics of the camera system that generated the image are known there are possibilities in deconvolving the optical transfer function of the camera.  Magic doesn't result but you can get some very noticeable improvements.  If you still have the original camera the OTF can be estimated using a family of test images.  Note that to get it right the camera has to be set up exactly the same way it was in the original picture (f/no, zoom and everything.).

A bit of googling can give you a fair understanding of the process.  Actual implementation is always a bit messy.

The hollywood representations are about equally realistic as the matter transmitters on the Starship Enterprise.
 

Offline Stray Electron

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Re: Can ordinary humans enhance blurry pictures yet ?
« Reply #30 on: March 09, 2021, 03:15:40 am »
    It really depends on your photographs. I use GIMP and I find that almost all pictures can be sharpened somewhat with it. But not like the nonsense that they show on television! Tweaking the Brightness and Contrast sometimes helps make certain elements in the picture more visible too.  Download a copy of GIMP and try it. It uses a slider to control the Sharpness and it shows a thumbnail image of a portion of the photo and you can position that over the area of interest and then watch the sharpness increase or decrease as you move the slider. For me, I get the best results at about 66 to 80%.  GIMP can be tricky if you want to save an image as a JPG since it wants to save changed images in it's own format so you have to Export the image and select JPG as the file type instead of just Saving it.  GIMP is available for both Windows and Linux and Mac OS and it's free.
« Last Edit: March 09, 2021, 03:20:18 am by Stray Electron »
 

Offline SilverSolder

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Re: Can ordinary humans enhance blurry pictures yet ?
« Reply #31 on: March 09, 2021, 03:56:37 am »
We are not yet seeing sound being picked out of the image...  I'm looking forward to the live demonstration!   :D
It has been demonstrated, there is nothing preventing these methods being done live (other than funding/development effort):


The only way to add information and reduce noise in a photo is it have multiple frames from the same perspective (of an unmoved object, like a guy on a security camera that stood still for 12 frames) and average them such that the random noise cancels and the similar information reinforces itself.
It certainly does not require multiple images of a still/unmoved object. Reconstruction from multiple perspectives/moving scene is usually superior. Some of the details are in the above video, but "enhance" from moving objects has been the traditional use case.

That is pretty impressive -  I guess that with a 5602Hz frame rate (using the frame to frame recognition method), a frequency response up to 2.8Khz should be theoretically possible (Nyquist again!).

Using the roller shutter is of course another step of totally awesome - wonder how much "unintended audio" has been encoded in videos across the world?

 

Offline RJSV

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Re: Can ordinary humans enhance blurry pictures yet ?
« Reply #32 on: March 09, 2021, 09:07:57 pm »
Yeah, LOL, like to see,...um, hear Tom Cruise yelling at that poor (mask less) stage-hand... (!!!)
 
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Online MathWizardTopic starter

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Re: Can ordinary humans enhance blurry pictures yet ?
« Reply #33 on: March 14, 2021, 04:59:37 am »
The only way to add information and reduce noise in a photo is it have multiple frames from the same perspective (of an unmoved object, like a guy on a security camera that stood still for 12 frames) and average them such that the random noise cancels and the similar information reinforces itself. Image enhancements other than adding information also exist, but those are based of manipulating the existing data, for example, using mathematical convolution masks.


I yeah some lecture, I guess rather recently, about using AI to examine pictures, and using some matrices of course, to extrapolate a more detail image ........but right, thats like the capthcha puzzle things too. So we aren't really there yet, movies have let me down again.

So I should try a proper image editor, but I doesn't really matter much for the PCB picture I had, the only cap values are easy enough to deduce.
 

Offline cdev

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Re: Can ordinary humans enhance blurry pictures yet ?
« Reply #34 on: March 15, 2021, 08:28:42 pm »
Some of the old movies that have been colorized and digitally enhanced look strikingly real. On Youtube they have some old films of new york city before my birth that are very realistic looking. I used to go into the city a lot as a child and some of these videos are old enough to still contain signs and landmarks that I remember from my childhood, now long gone. Colorization/enhancement  of films from the early 20th century really gives them a new life.

You can also use photogrammetry to digitally reconstruct some of the geometry they show.
« Last Edit: March 15, 2021, 08:30:28 pm by cdev »
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Offline Sal Ammoniac

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Re: Can ordinary humans enhance blurry pictures yet ?
« Reply #35 on: March 15, 2021, 10:57:03 pm »
The latest version of Camera Raw (a part of Photoshop) has AI that supposedly increases the resolution of pictures. Here's an article describing it...

https://petapixel.com/2021/03/13/adobe-photoshops-super-resolution-made-my-jaw-hit-the-floor/
"That's not even wrong" -- Wolfgang Pauli
 
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Offline SilverSolder

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Re: Can ordinary humans enhance blurry pictures yet ?
« Reply #36 on: March 16, 2021, 03:18:14 am »

It is fundamentally impossible to put information back in that is no longer there...

But it is entirely possible to make something up that looks plausible!  :D
 
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Offline cdev

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Re: Can ordinary humans enhance blurry pictures yet ?
« Reply #37 on: March 17, 2021, 01:36:37 pm »
I know this thead isnt about web images.. but since it seemed relevant..

The task of reducing graphics such as a title page, to serve as a link to another page, is often useful. Shrinking full sized pages of text or scientific graphics to their smallest legible screen representation where the text is readable. To do this I use GIMP and the Gaussian Blur function at around 1/3 of a pixel.0.33 (less than 1/2)
1) resize image size downward using the best quality algorithm
2) apply very subtle Gaussian Blur
3) apply very subtle Unsharp Mask to taste. Not too much.

Doing this you can get very good legibility for very small text. This process lends itself well to batch operations.

You can always make graphics smaller much smaller (for GIF compression by posterizing them (drastic color reduction)

This makes them very compressible. (Try it, you'll see what I mean) Probably because several image formats use RLE, run length encoding. (GIF and TIFF do, I think PNG may too. )





« Last Edit: March 17, 2021, 01:45:25 pm by cdev »
"What the large print giveth, the small print taketh away."
 
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Offline LaserSteve

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Re: Can ordinary humans enhance blurry pictures yet ?
« Reply #38 on: March 17, 2021, 05:49:16 pm »
If you want to play with Stills download ImageJ..
Then find some plug-ins and scripts for it.
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