Comments (1)
I guess that this is essentially the same issue as #161 and #235. To cite #161 (comment):
The reason the tag on the right is not detected is because of the sharp lighting gradient on the bottom left corner. This causes the adaptive thresholding (see debug_threshold.pnm) to classify a chunk of the white border as black, which causes the derived edge (see debug_clusters.pnm) to loop all the way back around the outside of the tag.
Without changing the thresholding implementation in the apriltag library you have to preprocess the image to better separate the black/white content of the tag.
You may also get lucky with decimation and blurring:
./apriltag_demo -d -x 4 -b 2 270263675-464348c1-3299-400c-8907-271f70722690.pnm
gives me one detection:
detection 0: id (36x11)-37 , hamming 1, margin 186.443
but not a good edge alignment for the quad:
from apriltag.
Related Issues (20)
- Improve documentation concerning estimated pose HOT 5
- What do the tag-specific hex codes in the c files represent?
- How to deal with tag36h9? HOT 1
- install problem HOT 5
- Clarify licensing HOT 1
- Geometric interpretation of estimation error HOT 2
- How to run pose estimation in python ? HOT 3
- compatibility with WIN32_LEAN_AND_MEAN HOT 8
- Anyone implmented c# wrapper for this? HOT 1
- error when i run make in ubuntu 22.04 HOT 1
- Has anyone confirmed that this library can work on ESP32S3? HOT 3
- How to use intrinsics in Scaramuzza format to estimate the apriltag pose? HOT 3
- Suggestions on improving detections in low light conditions HOT 4
- Python bindings for apriltag_detect throws error when no detection is found HOT 5
- What's the meaning of 'apriltag.c:448: homography_compute2: Assertion `max_val_idx >= 0' failed.'? HOT 5
- Planned Python Package Index (PyPI) package? HOT 4
- Build fail on Ubuntu Noble in g2d.c: `last_quadrant` is used unitialized; treat-all-warnings-as-errors HOT 4
- How to detect AprilGrid? HOT 5
- (Python) 'Nthreads' is an invalid keyword argument for this function HOT 1
Recommend Projects
-
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
-
Vue.js
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
-
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
-
TensorFlow
An Open Source Machine Learning Framework for Everyone
-
Django
The Web framework for perfectionists with deadlines.
-
Laravel
A PHP framework for web artisans
-
D3
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
-
Recommend Topics
-
javascript
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
-
web
Some thing interesting about web. New door for the world.
-
server
A server is a program made to process requests and deliver data to clients.
-
Machine learning
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
-
Visualization
Some thing interesting about visualization, use data art
-
Game
Some thing interesting about game, make everyone happy.
Recommend Org
-
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
-
Microsoft
Open source projects and samples from Microsoft.
-
Google
Google ❤️ Open Source for everyone.
-
Alibaba
Alibaba Open Source for everyone
-
D3
Data-Driven Documents codes.
-
Tencent
China tencent open source team.
from apriltag.