ganwenyao / opencv_js Goto Github PK

I'm trying to build opencv for use in my js project.

For the correct operation of the algorithm, I lack these functions:

• Point3f
• solvePnP
• Rodrigues
• findHomography

The functions I need are in these packages:

• Calib3d
• Features2d

But on the Internet I did not find the pre-compiled library with the functionality I needed. For this reason, I decided to build everything myself.

When assembling I am guided by https://docs.opencv.org/3.4/d5/d10/tutorial_js_root.html.

Compilation of the library was successful(!), but failed to build it.

1. I tried to compile it in the LLVM code and got the error:

wasm-ld: error: Relocations not in offset order

2. Next, I tried to compile it into *.so files, but to no avail: This assembly option is prohibited:

emscripten / cmake / Modules / Platform / Emscripten.cmake: set_property (GLOBAL PROPERTY TARGET_SUPPORTS_SHARED_LIBS FALSE))

3. The build method using static libraries in the *. ar archives format also ended with an error:

error: undefined symbol: fp $ _ZN2TH11THFile_freeEPNS

I know for sure that these packages can be compiled in some way. Can you give me a guide or pin js file with pre-compiled modules?

I tried with the latest opencv (v4 I think) and your instructions almost all work.

It breaks with this change to embindgen.py:

return re.sub(r"^cv\.[a-zA-Z0-9]*\.|cv\.", "", name).replace(".", "_")

Interestingly when I take that out and keep the original replacement, it seems to compile aruco fine - but no Dictionary class o_O

Would be helpful to have some other functions like Rodrigues and SolvePnP exported. Without those it's difficult to go past the basic axis demo.

This is the best repo and the only one that works with building openCV.js with the wrappers for aruco!

I'm also trying to include solvePnP and projectPoints from building openCV.js. I understand that you commented the overloaded or repeated function for aruco:
// CV_EXPORTS_W void drawMarker

I tried to do the same for projectPoints and it is not working.

Can you please provide some suggestions because you seem to know the workaround?

Thanks in advance!