General > General Technical Chat
Can ordinary humans enhance blurry pictures yet ?
RJSV:
Ok, so I looked up the wavelength, it's 1.1 foot, at sea level, 1Khz sound wave. The sound extraction algorithm can look one place, for peaks, contrasted with another location, within some 1.1 foot space, to extract data in a phased manner, (but assuming you have the propagation direction to try).
It's WILD, I doubt, but if I had to bet my life, it's probably something that can be, perhaps low frequencies only (below 100 Hz).
SilverSolder:
The sample rate cannot be higher than the frame rate? so 30Hz out of a web cam? by Nyquist, we should be able to detect 15Hz! :D
Someone:
--- Quote from: T3sl4co1l on March 07, 2021, 11:17:15 pm ---There's even a method to recover live audio from even rather poor quality video (e.g. < 60 FPS, low resolution webcam) -- the trick is using very small signals (down in the LSBs of pixels), over large areas, and correlating the changes across that area.
--- End quote ---
There is a wealth of information hiding inside most images, but it comes down to very specific characteristics of the image sensor as you noted.
--- Quote from: T3sl4co1l on March 07, 2021, 11:17:15 pm ---As far as I'm aware... the technique isn't a general purpose, drop in and go, method -- it requires a lot of massaging to recover useful audio
--- End quote ---
But then, lol, the uninformed come out to announce their superior fundamentally incorrect understandings again.
--- Quote from: SilverSolder on March 08, 2021, 12:35:53 am ---The sample rate cannot be higher than the frame rate? so 30Hz out of a web cam? by Nyquist, we should be able to detect 15Hz! :D
--- End quote ---
Or you could make an equally misleading performance claim about a camera at 60Hz frame (field) rate, that it has 8GS/s
https://www.photonics.com/Articles/133-MP_CMOS_Image_Sensor_Eliminates_Bulky_Optics/a57239
OMG 4GHz nyquist!!!!@
No, not really as the sampling is not evenly spaced in time.
RJSV:
Ok,pls excuse, return to Enhance of images:
I am aware of many examples, of course there is phantom limb, or false sense (of lost limb).
For your question, human brains are ready to 'fill in' for a lost or defective sense. So the waving of the hand, across in front of the face, can cause the brain to 'fill-in', again for the missing or flakey ACTUAL view.
This optical, and neurological process, I believe is termed (informally, as I am not a PRO), termed as
'Visual phantom limb'.
That's where the person has a vague impression or sight, blurred blob, only approximately where the actual real hand is located.
So, in this case you maybe can't trust the image, but there possibly are these internal mechanisms that have more validity.
In my example above, there is NO visual connection, rather all the 'input' being the motor neurons and muscle info, being used in this strange process.
If you think about it, that arm of yours has moved across your field of view, many thousands or millions of times. So in absence of vision, that brain tries to supply or synthesize that view.
It's a huge field, but it's interesting to study (neurology) in the context of the modern processors and image processing math.
SilverSolder:
--- Quote from: Someone on March 08, 2021, 01:09:53 am ---
--- Quote from: T3sl4co1l on March 07, 2021, 11:17:15 pm ---There's even a method to recover live audio from even rather poor quality video (e.g. < 60 FPS, low resolution webcam) -- the trick is using very small signals (down in the LSBs of pixels), over large areas, and correlating the changes across that area.
--- End quote ---
There is a wealth of information hiding inside most images, but it comes down to very specific characteristics of the image sensor as you noted.
--- Quote from: T3sl4co1l on March 07, 2021, 11:17:15 pm ---As far as I'm aware... the technique isn't a general purpose, drop in and go, method -- it requires a lot of massaging to recover useful audio
--- End quote ---
But then, lol, the uninformed come out to announce their superior fundamentally incorrect understandings again.
--- Quote from: SilverSolder on March 08, 2021, 12:35:53 am ---The sample rate cannot be higher than the frame rate? so 30Hz out of a web cam? by Nyquist, we should be able to detect 15Hz! :D
--- End quote ---
Or you could make an equally misleading performance claim about a camera at 60Hz frame (field) rate, that it has 8GS/s
https://www.photonics.com/Articles/133-MP_CMOS_Image_Sensor_Eliminates_Bulky_Optics/a57239
OMG 4GHz nyquist!!!!@
No, not really as the sampling is not evenly spaced in time.
--- End quote ---
Let's just say that detecting audio by looking at images is probably in the "challenging" territory! :D
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