a friend of mine asked me to scan a A4 book. i wanted to see the best distances glass -camera and if the zoom scale affect the results.
so i unscrew this panel of a cupboard which has a window
and put it in 2 chairs
then place the camera in a pillup of cd roms (books can also get used)
calibrate the camera (model canon a3300)
calculate with a meter the distance and capture a bunch of photos this is the best i made , the suggested dpi is 510 since is quite difiiclut to black and white a book with many colors and more than 800 pages i gave this book in a folder of 800 mb
did the same with xiaomi redmi 5 plus . suggested dpi 350
of course even if the suggested dpi is bigger rather than the 580 dpi of a normal book in the 2 camera diybookscanner the results is not neccesary better due to the curve on the middle . the results is not so much visible in color mode but in b&w results
in A4 books with the same press in the middle results use to be better
So a scanner of 2 smartphones camera can be made without the need of cutten wood . the results can be enough good but 2 camera diybookscanner will always be better with the right ankles of the light and the best glass-camera distance . personally for a4 books i will use the methods above till i made some changes in my scanner because i cant hit this dpi resuts for a4 books.
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something more for smartphones users i found while using smarthpones
method 1
use this site airdroid dont know what happern after 2 weeks but you have liveview ,capture photo from pc and download (the quality differ than the one r with a bluetooth or audio trigger the camera).
method 2
crab an old router and use app screen cast and firefox to have liveview .(vysor wasnt good enough) you still can have acces indside your dcim/camera if you press f5 every time an image is get add
method 3
could not set it work but i thinks here is the beginning for somebody who wants to try it
for more android and python users check this to make something like capture and download and after that please share your work
this
https://www.youtube.com/watch?v=3wMlCucwGvE
drivers found here
https://developer.android.com/studio/command-line/adb
and this man did this
https://gist.github.com/me7/12ad7c823a1 ... b4fcd72b87
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whantd to do something like that
folder name = This computer \ Redmi 5 Plus \ DCIM \ Camera
Number of images1 = measures number of photos * jpg
Unless you hit Esc
click inside the folder \ Redmi 5 Plus \ DCIM \ camera the button F5
Number of images2 = measures number of photos * jpg
If Number of Images1 <= Number of Images2
Do not do anything
go to the beginning of the Loop
Otherwise
Number of images1 takes value Number of images2
close all Windows viewers
double-click on the last image
go to the top of the Loop without leaving the Windows viewer from the desktop