| # Browser background remover |
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| U-2-Net FP32 ONNX, Apache-2.0, from BritishWerewolf/U-2-Net at pinned revision |
| c08042b462485d8597c89d3ce831d00be8582c5c. Upstream model: |
| https://github.com/xuebinqin/U-2-Net |
| Converted weights: https://huggingface.co/BritishWerewolf/U-2-Net |
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| One model, ~176 MB decimal, served from Hugging Face in production (see |
| ../README.md) and split into content-addressed 50 MiB |
| parts. u2net.json records SHA-256 hashes. Build verifies each part and the whole |
| model; runtime verifies parts before inference. Cache Storage is best-effort. |
| ONNX Runtime 1.24.3 uses matching same-origin WASM assets, with one thread in a |
| worker. Its MIT license/third-party notices are retained in public/ocr. |
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| Preprocessing follows rembg: 320x320 RGB, RGB maximum rescaling and ImageNet |
| means/std. Output mask uses min/max normalization and scales to original image |
| dimensions. Existing alpha is multiplied, not replaced. No input is uploaded. |
| This is foreground segmentation, not full foreground-color matting: fine hair, |
| fur, glass and low contrast remain difficult. No perfect-quality claim. |
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| One worker/session runs at a time. Cancellation terminates it; idle release is |
| 60 seconds. Bounds: 30 MiB input, 24 MP, 8192 per side, 240-second timeout. |
| Browser decoding precedes our dimension guard. This does not protect against |
| every malformed decoder input. File names and pixels are not logged/uploaded. |
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| BiRefNet_lite was evaluated but not shipped: WASM ran out of memory, and the |
| experimental GPU path fell back after runtime failure. A Concat adaptation was |
| also evaluated without establishing a reliable detailed-model path. Evaluation |
| files remain outside the application. Do not call this model the best available |
| or claim benchmark superiority. Release choice prioritizes verified operation. |
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