This is a work in progress and sudden, dramatic changes are expected!
FreeLens
This project provides a reference implementation of NaviLens and ddTag for educational or personal use. Commercial use is at your own risk as NaviLens and ddTag may attempt to enforce their IP.
Documentation
Quickstart
Installation
pip install freelens
Generating Tags
FreeLens generates 5×5, 7×7, 9×9, and 11×11 tags. The 5×5 generator uses the CRC found in deployed NaviLens tags. Larger generators extend that calculation with the CRC width and polynomial for their size. Their CRCs are not validated because no deployed examples have been tested.
from freelens import Tag
message = "101010101011000000001011"
tag = Tag.from_message(message, n=5)
tag_img = tag.to_image()
tag_img.save("tag.png")
Generated tags larger than 5×5 report an unknown CRC status:
tag = Tag.from_message("0" * 64, n=7)
assert tag.crc_valid is None
Detecting Tags
from freelens import detect_tags
from PIL import Image
img = Image.open("dataset/positives/0001.jpg")
tags_list = detect_tags(
img,
n=5,
validate_crc=True,
require_valid_crc=True,
)
for tag in tags_list:
print(tag.message)
1 maintainer
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File details
Details for the file freelens-0.0.4.tar.gz.
File metadata
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- Upload date:
- Size: 6.6 kB
- Tags: Source
- Uploaded using Trusted Publishing? Yes
- Uploaded via:
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Provenance
The following attestation bundles were made for freelens-0.0.4.tar.gz:
Publisher:
release.yml on sjtrny/freelens
-
Statement:
-
Statement type:
https://in-toto.io/Statement/v1 -
Predicate type:
https://docs.pypi.org/attestations/publish/v1 -
Subject name:
freelens-0.0.4.tar.gz -
Subject digest:
d31b66e062d097fb4fae86af3be87162924af3de250ab5fffadfeb96e0d1db77 - Sigstore transparency entry: 2466361570
- Sigstore integration time:
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Permalink:
sjtrny/freelens@7f29f9e904bc67e96c2627a41fc35c95652d4aaa -
Branch / Tag:
refs/tags/v0.0.4 - Owner: https://github.com/sjtrny
-
Access:
public
-
Token Issuer:
https://token.actions.githubusercontent.com -
Runner Environment:
github-hosted -
Publication workflow:
release.yml@7f29f9e904bc67e96c2627a41fc35c95652d4aaa -
Trigger Event:
release
-
Statement type:
File details
Details for the file freelens-0.0.4-py3-none-any.whl.
File metadata
- Download URL: freelens-0.0.4-py3-none-any.whl
- Upload date:
- Size: 6.9 kB
- Tags: Python 3
- Uploaded using Trusted Publishing? Yes
- Uploaded via:
twine/7.0.0 CPython/3.13.14
File hashes
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|
Provenance
The following attestation bundles were made for freelens-0.0.4-py3-none-any.whl:
Publisher:
release.yml on sjtrny/freelens
-
Statement:
-
Statement type:
https://in-toto.io/Statement/v1 -
Predicate type:
https://docs.pypi.org/attestations/publish/v1 -
Subject name:
freelens-0.0.4-py3-none-any.whl -
Subject digest:
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- Sigstore integration time:
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Permalink:
sjtrny/freelens@7f29f9e904bc67e96c2627a41fc35c95652d4aaa -
Branch / Tag:
refs/tags/v0.0.4 - Owner: https://github.com/sjtrny
-
Access:
public
-
Token Issuer:
https://token.actions.githubusercontent.com -
Runner Environment:
github-hosted -
Publication workflow:
release.yml@7f29f9e904bc67e96c2627a41fc35c95652d4aaa -
Trigger Event:
release
-
Statement type:
