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Fake background blur on camera-phones

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Mechatrommer:
yes agreed, AI that is not clever enough, exactly this thread is all about.. i'm not going to do in-depth comparison in ee forum, and i should've setup a better controlled environment rather than a random mess. i know what it is, it is what it is. i just took a random picture, in the way mimicking the way i usually did in low light and challenging event. or pushing or knowing the limit of high iso high noise and how good today's denoise can do.. this AI still need human AI (actual intelligent) touch to improve or select the good part of it in photoshop and mask out the worse parts.. but it will need time... ymmv.

Berni:
Yeah right now AI is best when guided by an actual human.

The benefit of AI in image editing is automating the tedious tasks. Like an easy example is "content aware fill" to remove something from a photo. Doing that by hand can be very time consuming to grab the correct parts of the background, duplicate them out in a way that doesn't make an obvious repeating pattern, align them well, blend it in to the rest..etc. The content aware fill simplifies that down to just selecting the thing you want gone and waiting a fraction of a second. Saves a massive amount of time.

coppice:

--- Quote from: Berni on March 10, 2023, 06:45:29 am ---Yeah right now AI is best when guided by an actual human.

--- End quote ---
Yeah, right now a novice human is best when guided by a skilled human,

5U4GB:

--- Quote from: steve30 on November 29, 2022, 04:55:49 am ---Someone on IRC linked me to a major manufacturer's product page (I forget which) where they were promoting their shallow depth of field phone camera, and gave loads of example pictures. Some were actually quite good, but I'd say on half of them, it was blindingly obvious that it was faked.

--- End quote ---

Well, people with DSLRs buy fancy tilt-shift lenses to get the same effect, so someone probably thought "hey, lets emulate that in software!".  There are times when it's pretty useful... OK, not many times, but still some, and given the useless junk phone vendors are now putting in they've pretty much run out of ideas elsewhere.

TimFox:

--- Quote from: 5U4GB on March 10, 2023, 10:09:34 am ---
--- Quote from: steve30 on November 29, 2022, 04:55:49 am ---Someone on IRC linked me to a major manufacturer's product page (I forget which) where they were promoting their shallow depth of field phone camera, and gave loads of example pictures. Some were actually quite good, but I'd say on half of them, it was blindingly obvious that it was faked.

--- End quote ---

Well, people with DSLRs buy fancy tilt-shift lenses to get the same effect, so someone probably thought "hey, lets emulate that in software!".  There are times when it's pretty useful... OK, not many times, but still some, and given the useless junk phone vendors are now putting in they've pretty much run out of ideas elsewhere.

--- End quote ---

Once the image is formed at the sensor or film surface, it cannot be re-focused.
Of course, one can apply filters to the image data in order to, for example, boost the high-frequency content of the image after that, or smoosh the high frequencies to obtain blur.
The purpose of a tilt-shift lens is to obtain a limited effect, better done with a "view camera", to establish a plane of best focus (in object space) that is focused onto the image plane, by tilting the lens plane with respect to the image plane;  view cameras have far more tilt angle and shift displacement than a normal "tilt-shift" lens for an SLR or DSLR.
"Tilt" here means rotating the lens holder about a horizontal axis, and "swing" means rotating about a vertical axis, depending on the exact application, possibly of both.
For example, a typical Ansel Adams photograph would tilt the lens down so that the top of a distant mountain and the brook close to the camera are both in good focus, allowing the less interesting object space between them to go "soft". 
"Shift" means displacing the lens axis with respect to the center of the image.
This is useful, for example, when you make the lens and image planes vertical, to avoid convergence of vertical lines in the tall building you are imaging, and shift the lens upwards to reduce the amount of parking lot in the foreground.
For a detailed analysis, look up the "Scheimpflug principle":  https://www.opticsforhire.com/blog/scheimpflug-principle/

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