File size: 3,033 Bytes
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"default_mode": "document",
"modes": {
"none": {
"description": "No preprocessing (passthrough)",
"deskew": false,
"clahe": false,
"binarize": false,
"gamma_correction": false,
"sharpen": false,
"grayscale": false,
"target_size": null
},
"auto": {
"description": "Inspect image and apply needed fixes automatically",
"deskew": true,
"clahe": "auto",
"binarize": false,
"gamma_correction": "auto",
"sharpen": "auto",
"grayscale": false,
"target_size": 1024
},
"document": {
"description": "Deskew + CLAHE contrast enhancement (default for general documents)",
"deskew": true,
"clahe": true,
"binarize": false,
"gamma_correction": false,
"sharpen": false,
"grayscale": false,
"target_size": 1024,
"clahe_clip_limit": 2.0,
"clahe_grid_size": 8
},
"low-contrast": {
"description": "Aggressive CLAHE + gamma correction for faded scans",
"deskew": true,
"clahe": true,
"binarize": false,
"gamma_correction": true,
"sharpen": false,
"grayscale": false,
"target_size": 1024,
"clahe_clip_limit": 4.0,
"gamma_value": 1.5
},
"grayscale": {
"description": "Convert to grayscale + Otsu binarization",
"deskew": true,
"clahe": false,
"binarize": true,
"gamma_correction": false,
"sharpen": false,
"grayscale": true,
"target_size": 1024
},
"high-resolution": {
"description": "Resize longest side to 1024 with Lanczos + sharpen",
"deskew": false,
"clahe": true,
"binarize": false,
"gamma_correction": false,
"sharpen": true,
"grayscale": false,
"target_size": 1024
},
"table": {
"description": "Deskew + CLAHE + sharpening for grid lines and table structure",
"deskew": true,
"clahe": true,
"binarize": false,
"gamma_correction": false,
"sharpen": true,
"grayscale": false,
"target_size": 1024,
"clahe_clip_limit": 3.0
},
"adaptive-binarize": {
"description": "Detect sideways orientation and apply local Sauvola binarization",
"deskew": true,
"clahe": false,
"binarize": "sauvola",
"gamma_correction": false,
"sharpen": false,
"grayscale": false,
"target_size": 1024
},
"photo-document": {
"description": "Perspective-correct photographed pages, detect sideways orientation, then enhance contrast and lighting",
"deskew": false,
"perspective_correction": true,
"clahe": true,
"binarize": false,
"gamma_correction": true,
"sharpen": false,
"grayscale": false,
"target_size": 1024,
"clahe_clip_limit": 3.0,
"gamma_value": 1.3
}
},
"_note": "Preprocessing is always optional. The raw input path remains available for baseline comparison. Applied steps are recorded in output metadata."
}
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