deface

Remove facial features from a brain MRI for anonymization — entirely in your browser. No data is sent to any server.

Defacing runs niimath, which implements two registration backends:

• spm_deface — SPM rigid-body coregistration (spm_coreg, J. Ashburner / Wellcome Centre)
• deface — affine registration (3dAllineate, RW Cox / AFNI)
• mindgrab — deep-learning brain extraction (skull-strip): a brainchop-style model runs entirely on the GPU (WebGPU, shader-f16) to mask out everything but the brain

Visualization uses NiiVue; DICOM import uses dcm2niix.

Because the SPM spm_deface path links the GPL spm_coreg module, this app is licensed GPL-2. Requires a browser with WebGPU (recent desktop Chrome, Edge, or Safari).

Defacing uses the GPL build of niimath (@niivue/niimath/gpl) · thread-deterministic registration, fails closed on out-of-memory.

MindGrab needs WebGPU

The mindgrab brain-extraction method runs a neural network on the GPU and needs WebGPU with the shader-f16 feature (recent desktop Chrome, Edge, or Safari). This browser doesn't provide it.

Use spm_deface or deface instead — they run in WebAssembly and need no WebGPU.