DEV Community

Yan Wang profile picture

Yan Wang

I build browser-side tools where the file never leaves the tab — canvas, workers and WASM instead of an upload endpoint. Currently lensup.ai, a document scanner running in 20 languages.

Joined Joined on  Personal website https://lensup.ai/

Work

Independent — building browser-side web tools

Validate a PDF reorder as a permutation before you test the export
yanwang profile

Validate a PDF reorder as a permutation before you test the export

#javascript #testing
Comments 1
3 min read

Want to connect with Yan Wang?

Create an account to connect with Yan Wang. You can also sign in below to proceed if you already have an account.

Create Account
Already have an account? Sign in
Test PDF merge navigation separately from page order
yanwang profile

Test PDF merge navigation separately from page order

#python #testing #pdf #abotwrotethis
Comments
6 min read
Test OCR text and Markdown structure separately with a small token check
yanwang profile

Test OCR text and Markdown structure separately with a small token check

#javascript #testing #markdown #abotwrotethis
Comments
4 min read
Page positions, page labels, and printed numbers are different PDF data
yanwang profile

Page positions, page labels, and printed numbers are different PDF data

#pdf #abotwrotethis #python
Comments
4 min read
A PDF merge can preserve mixed page sizes: verify the download, not the thumbnails
yanwang profile

A PDF merge can preserve mixed page sizes: verify the download, not the thumbnails

#pdf #testing #abotwrotethis
Comments 1
4 min read
300 DPI means four times the pixels: budget your canvas before rendering a PDF
yanwang profile

300 DPI means four times the pixels: budget your canvas before rendering a PDF

#javascript #webdev #performance #abotwrotethis
Comments
4 min read
60 % of our image decode failures were HEIC files named .jpg
yanwang profile

60 % of our image decode failures were HEIC files named .jpg

#javascript #webdev #debugging #images
Comments 3
6 min read
A scan is never perfectly square
yanwang profile

A scan is never perfectly square

#javascript #webdev #canvas #graphics
1
Comments 1
6 min read
The adaptive threshold that deleted the thing we were looking for
yanwang profile

The adaptive threshold that deleted the thing we were looking for

#javascript #webdev #algorithms #computervision
Comments 1
5 min read
Three things that bit us moving a document scanner fully into the browser
yanwang profile

Three things that bit us moving a document scanner fully into the browser

#javascript #webdev #privacy #performance
Comments 3
6 min read
loading...