MobileRead Forums - View Single Post - Automation of scanning on phone or tablet

anonlivros · 11-08-2021, 07:16 AM

Hi! I am the creator of the tutorial mentioned.
I'm glad the tutorial continues to help more people. Thanks for share, Tex!

Tips:
1) About the app used to take photos, over time I found a better one.
The app is called 'Open Camera'
https://play.google.com/store/apps/d...hl=pt_BR&gl=US
He is better because:
- Allows you to generate images with minimal compression, which increases quality (more definition in the outline of the letters). Provides higher quality images taken with other apps I've tested.
- Allows you to lock the camera's Focus, which eliminates the risk of blurry photos. This risk exists when the 'auto focus adjustment' option is enabled, as during the act of turning the page, the camera may try to readjust the focus and the photograph may be taken during this adjustment, resulting in blurry photography.

2) For sound trigger, I suggest whistling low, like the chirping of a chick. It's more practical than speaking a syllable.

3) I also strongly recommend using Scantailor for dewarp and crop, generating B&W images. This step must be prior to abbyy finereader.

4) I also recommend equalizing the size of page content. When taking left/right photographs, rather than both pages simultaneously, depending on book thickness, there will be a page size distortion of up to 10% between consecutive pages. The distortion is most severe at the beginning and end of the book, being milder as it gets closer to the middle pages. This natural distortion is caused by the difference in distance between the page and the camera.
Some ebook producers don't mind this size distortion, as their ultimate goal is to produce an Epub. (Like Tex hehe)
But if you care to eliminate visual distortion, producing a PDF with better aesthetics, I've produced a little python script that fixes them from just 4 pieces of information.
Check the post:
Page Size Equalizer-To single-page capture camera scan

I know, I know... The tutorial needs to be updated.
I've learned some interesting things over the last few months, especially from sharing experience with Tex. (Which I reserve a gratitude that I couldn't properly express in this post)

I hope your digitization projects help a lot of people.
Keep sharing.

11-08-2021, 07:16 AM	#9
anonlivros Junior Member Posts: 5 Karma: 40142 Join Date: Apr 2021 Device: none	Additional tutorial comments Hi! I am the creator of the tutorial mentioned. I'm glad the tutorial continues to help more people. Thanks for share, Tex! Tips: 1) About the app used to take photos, over time I found a better one. The app is called 'Open Camera' https://play.google.com/store/apps/d...hl=pt_BR&gl=US He is better because: - Allows you to generate images with minimal compression, which increases quality (more definition in the outline of the letters). Provides higher quality images taken with other apps I've tested. - Allows you to lock the camera's Focus, which eliminates the risk of blurry photos. This risk exists when the 'auto focus adjustment' option is enabled, as during the act of turning the page, the camera may try to readjust the focus and the photograph may be taken during this adjustment, resulting in blurry photography. 2) For sound trigger, I suggest whistling low, like the chirping of a chick. It's more practical than speaking a syllable. 3) I also strongly recommend using Scantailor for dewarp and crop, generating B&W images. This step must be prior to abbyy finereader. 4) I also recommend equalizing the size of page content. When taking left/right photographs, rather than both pages simultaneously, depending on book thickness, there will be a page size distortion of up to 10% between consecutive pages. The distortion is most severe at the beginning and end of the book, being milder as it gets closer to the middle pages. This natural distortion is caused by the difference in distance between the page and the camera. Some ebook producers don't mind this size distortion, as their ultimate goal is to produce an Epub. (Like Tex hehe) But if you care to eliminate visual distortion, producing a PDF with better aesthetics, I've produced a little python script that fixes them from just 4 pieces of information. Check the post: Page Size Equalizer-To single-page capture camera scan I know, I know... The tutorial needs to be updated. I've learned some interesting things over the last few months, especially from sharing experience with Tex. (Which I reserve a gratitude that I couldn't properly express in this post) I hope your digitization projects help a lot of people. Keep sharing.