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Backup commit before executing remove-unused-code proposal.
This includes all pending changes and new features.

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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# Design: OCR Processing Presets
## Architecture Overview
```
┌─────────────────────────────────────────────────────────────────┐
│ Frontend │
├─────────────────────────────────────────────────────────────────┤
│ ┌──────────────────┐ ┌──────────────────────────────────┐ │
│ │ Preset Selector │───▶│ Advanced Parameter Panel │ │
│ │ (Simple Mode) │ │ (Expert Mode) │ │
│ └──────────────────┘ └──────────────────────────────────┘ │
│ │ │ │
│ └───────────┬───────────────┘ │
│ ▼ │
│ ┌─────────────────┐ │
│ │ OCR Config JSON │ │
│ └─────────────────┘ │
└─────────────────────────────────────────────────────────────────┘
│
▼ POST /api/v2/tasks
┌─────────────────────────────────────────────────────────────────┐
│ Backend │
├─────────────────────────────────────────────────────────────────┤
│ ┌──────────────────┐ ┌──────────────────────────────────┐ │
│ │ Preset Resolver │───▶│ OCR Config Validator │ │
│ └──────────────────┘ └──────────────────────────────────┘ │
│ │ │ │
│ └───────────┬───────────────┘ │
│ ▼ │
│ ┌─────────────────┐ │
│ │ OCRService │ │
│ │ (with config) │ │
│ └─────────────────┘ │
│ │ │
│ ▼ │
│ ┌─────────────────┐ │
│ │ PPStructureV3 │ │
│ │ (configured) │ │
│ └─────────────────┘ │
└─────────────────────────────────────────────────────────────────┘
```
## Data Models
### OCRPreset Enum
```python
class OCRPreset(str, Enum):
TEXT_HEAVY = "text_heavy" # Reports, articles, manuals
DATASHEET = "datasheet" # Technical datasheets, TDS
TABLE_HEAVY = "table_heavy" # Financial reports, spreadsheets
FORM = "form" # Applications, surveys
MIXED = "mixed" # General documents
CUSTOM = "custom" # User-defined settings
```
### OCRConfig Model
```python
class OCRConfig(BaseModel):
# Table Processing
table_parsing_mode: Literal["full", "conservative", "classification_only", "disabled"] = "conservative"
table_layout_threshold: float = Field(default=0.65, ge=0.0, le=1.0)
enable_wired_table: bool = True
enable_wireless_table: bool = False # Disabled by default (aggressive)
# Layout Detection
layout_detection_model: Optional[str] = "PP-DocLayout_plus-L"
layout_threshold: Optional[float] = Field(default=None, ge=0.0, le=1.0)
layout_nms_threshold: Optional[float] = Field(default=None, ge=0.0, le=1.0)
layout_merge_mode: Optional[Literal["large", "small", "union"]] = "union"
# Preprocessing
use_doc_orientation_classify: bool = True
use_doc_unwarping: bool = False # Causes distortion
use_textline_orientation: bool = True
# Recognition Modules
enable_chart_recognition: bool = True
enable_formula_recognition: bool = True
enable_seal_recognition: bool = False
enable_region_detection: bool = True
```
### Preset Definitions
```python
PRESET_CONFIGS: Dict[OCRPreset, OCRConfig] = {
OCRPreset.TEXT_HEAVY: OCRConfig(
table_parsing_mode="disabled",
table_layout_threshold=0.7,
enable_wired_table=False,
enable_wireless_table=False,
enable_chart_recognition=False,
enable_formula_recognition=False,
),
OCRPreset.DATASHEET: OCRConfig(
table_parsing_mode="conservative",
table_layout_threshold=0.65,
enable_wired_table=True,
enable_wireless_table=False, # Key: disable aggressive wireless
),
OCRPreset.TABLE_HEAVY: OCRConfig(
table_parsing_mode="full",
table_layout_threshold=0.5,
enable_wired_table=True,
enable_wireless_table=True,
),
OCRPreset.FORM: OCRConfig(
table_parsing_mode="conservative",
table_layout_threshold=0.6,
enable_wired_table=True,
enable_wireless_table=False,
),
OCRPreset.MIXED: OCRConfig(
table_parsing_mode="classification_only",
table_layout_threshold=0.55,
),
}
```
## API Design
### Task Creation with OCR Config
```http
POST /api/v2/tasks
Content-Type: multipart/form-data
file: <binary>
processing_track: "ocr"
ocr_preset: "datasheet" # Optional: use preset
ocr_config: { # Optional: override specific params
"table_layout_threshold": 0.7
}
```
### Get Available Presets
```http
GET /api/v2/ocr/presets
Response:
{
"presets": [
{
"name": "datasheet",
"display_name": "Technical Datasheet",
"description": "Optimized for product specifications and technical documents",
"icon": "description",
"config": { ... }
},
...
]
}
```
## Frontend Components
### PresetSelector Component
```tsx
interface PresetSelectorProps {
value: OCRPreset;
onChange: (preset: OCRPreset) => void;
showAdvanced: boolean;
onToggleAdvanced: () => void;
}
// Visual preset cards with icons:
// 📄 Text Heavy - Reports & Articles
// 📊 Datasheet - Technical Documents
// 📈 Table Heavy - Financial Reports
// 📝 Form - Applications & Surveys
// 📑 Mixed - General Documents
// ⚙️ Custom - Expert Settings
```
### AdvancedConfigPanel Component
```tsx
interface AdvancedConfigPanelProps {
config: OCRConfig;
onChange: (config: Partial<OCRConfig>) => void;
preset: OCRPreset; // To show which values differ from preset
}
// Sections:
// - Table Processing (collapsed by default)
// - Layout Detection (collapsed by default)
// - Preprocessing (collapsed by default)
// - Recognition Modules (collapsed by default)
```
## Key Design Decisions
### 1. Preset as Default, Custom as Exception
Users should start with presets. Only expose advanced panel when:
- User explicitly clicks "Advanced Settings"
- User selects "Custom" preset
- User has previously saved custom settings
### 2. Conservative Defaults
All presets default to conservative settings:
- `enable_wireless_table: false` (most aggressive, causes cell explosion)
- `table_layout_threshold: 0.6+` (reduce false table detection)
- `use_doc_unwarping: false` (causes distortion)
### 3. Config Inheritance
Custom config inherits from preset, only specified fields override:
```python
final_config = PRESET_CONFIGS[preset].copy()
final_config.update(custom_overrides)
```
### 4. No Patch Behaviors
All post-processing patches are disabled by default:
- `cell_validation_enabled: false`
- `gap_filling_enabled: false`
- `table_content_rebuilder_enabled: false`
Focus on getting PP-Structure output right with proper configuration.

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# Proposal: Add OCR Processing Presets and Parameter Configuration
## Summary
Add frontend UI for configuring PP-Structure OCR processing parameters with document-type presets and advanced parameter tuning. This addresses the root cause of table over-detection by allowing users to select appropriate processing modes for their document types.
## Problem Statement
Currently, PP-Structure's table parsing is too aggressive for many document types:
1. **Layout detection** misclassifies structured text (e.g., datasheet right columns) as tables
2. **Table cell parsing** over-segments these regions, causing "cell explosion"
3. **Post-processing patches** (cell validation, gap filling, table rebuilder) try to fix symptoms but don't address root cause
4. **No user control** - all settings are hardcoded in backend config.py
## Proposed Solution
### 1. Document Type Presets (Simple Mode)
Provide predefined configurations for common document types:
| Preset | Description | Table Parsing | Layout Threshold | Use Case |
|--------|-------------|---------------|------------------|----------|
| `text_heavy` | Documents with mostly paragraphs | disabled | 0.7 | Reports, articles, manuals |
| `datasheet` | Technical datasheets with tables/specs | conservative | 0.65 | Product specs, TDS |
| `table_heavy` | Documents with many tables | full | 0.5 | Financial reports, spreadsheets |
| `form` | Forms with fields | conservative | 0.6 | Applications, surveys |
| `mixed` | Mixed content documents | classification_only | 0.55 | General documents |
| `custom` | User-defined settings | user-defined | user-defined | Advanced users |
### 2. Advanced Parameter Panel (Expert Mode)
Expose all PP-Structure parameters for fine-tuning:
**Table Processing:**
- `table_parsing_mode`: full / conservative / classification_only / disabled
- `table_layout_threshold`: 0.0 - 1.0 (higher = stricter table detection)
- `enable_wired_table`: true / false
- `enable_wireless_table`: true / false
- `wired_table_model`: model selection
- `wireless_table_model`: model selection
**Layout Detection:**
- `layout_detection_model`: model selection
- `layout_threshold`: 0.0 - 1.0
- `layout_nms_threshold`: 0.0 - 1.0
- `layout_merge_mode`: large / small / union
**Preprocessing:**
- `use_doc_orientation_classify`: true / false
- `use_doc_unwarping`: true / false
- `use_textline_orientation`: true / false
**Other Recognition:**
- `enable_chart_recognition`: true / false
- `enable_formula_recognition`: true / false
- `enable_seal_recognition`: true / false
### 3. API Endpoint
Add endpoint to accept processing configuration:
```
POST /api/v2/tasks
{
"file": ...,
"processing_track": "ocr",
"ocr_preset": "datasheet", // OR
"ocr_config": {
"table_parsing_mode": "conservative",
"table_layout_threshold": 0.65,
...
}
}
```
### 4. Frontend UI Components
1. **Preset Selector**: Dropdown with document type icons and descriptions
2. **Advanced Toggle**: Expand/collapse for parameter panel
3. **Parameter Groups**: Collapsible sections for table/layout/preprocessing
4. **Real-time Preview**: Show expected behavior based on settings
## Benefits
1. **Root cause fix**: Address table over-detection at the source
2. **User empowerment**: Users can optimize for their specific documents
3. **No patches needed**: Clean PP-Structure output without post-processing hacks
4. **Iterative improvement**: Users can fine-tune and share working configurations
## Scope
- Backend: API endpoint, preset definitions, parameter validation
- Frontend: UI components for preset selection and parameter tuning
- No changes to PP-Structure core - only configuration
## Success Criteria
1. Users can select appropriate preset for document type
2. OCR output matches document reality without post-processing patches
3. Advanced users can fine-tune all PP-Structure parameters
4. Configuration can be saved and reused
## Risks & Mitigations
| Risk | Mitigation |
|------|------------|
| Users overwhelmed by parameters | Default to presets, hide advanced panel |
| Wrong preset selection | Provide visual examples for each preset |
| Breaking changes | Keep backward compatibility with defaults |
## Timeline
Phase 1: Backend API and presets (2-3 days)
Phase 2: Frontend preset selector (1-2 days)
Phase 3: Advanced parameter panel (2-3 days)
Phase 4: Documentation and testing (1 day)

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# OCR Processing - Delta Spec
## ADDED Requirements
### Requirement: REQ-OCR-PRESETS - Document Type Presets
The system MUST provide predefined OCR processing configurations for common document types.
Available presets:
- `text_heavy`: Optimized for text-heavy documents (reports, articles)
- `datasheet`: Optimized for technical datasheets
- `table_heavy`: Optimized for documents with many tables
- `form`: Optimized for forms and applications
- `mixed`: Balanced configuration for mixed content
- `custom`: User-defined configuration
#### Scenario: User selects datasheet preset
- Given a user uploading a technical datasheet
- When they select the "datasheet" preset
- Then the system applies conservative table parsing mode
- And disables wireless table detection
- And sets layout threshold to 0.65
#### Scenario: User selects text_heavy preset
- Given a user uploading a text-heavy report
- When they select the "text_heavy" preset
- Then the system disables table recognition
- And focuses on text extraction
### Requirement: REQ-OCR-PARAMS - Advanced Parameter Configuration
The system MUST allow advanced users to configure individual PP-Structure parameters.
Configurable parameters include:
- Table parsing mode (full/conservative/classification_only/disabled)
- Table layout threshold (0.0-1.0)
- Wired/wireless table detection toggles
- Layout detection model selection
- Preprocessing options (orientation, unwarping, textline)
- Recognition module toggles (chart, formula, seal)
#### Scenario: User adjusts table layout threshold
- Given a user experiencing table over-detection
- When they increase table_layout_threshold to 0.7
- Then fewer regions are classified as tables
- And text regions are preserved correctly
#### Scenario: User disables wireless table detection
- Given a user processing a datasheet with cell explosion
- When they disable enable_wireless_table
- Then only bordered tables are detected
- And structured text is not split into cells
### Requirement: REQ-OCR-API - OCR Configuration API
The task creation API MUST accept OCR configuration parameters.
API accepts:
- `ocr_preset`: Preset name to apply
- `ocr_config`: Custom configuration object (overrides preset)
#### Scenario: Create task with preset
- Given an API request with ocr_preset="datasheet"
- When the task is created
- Then the datasheet preset configuration is applied
- And the task processes with conservative table parsing
#### Scenario: Create task with custom config
- Given an API request with ocr_config containing custom values
- When the task is created
- Then the custom configuration overrides defaults
- And the task uses the specified parameters
## MODIFIED Requirements
### Requirement: REQ-OCR-DEFAULTS - Default Processing Configuration
The system default configuration MUST be conservative to prevent over-detection.
Default values:
- `table_parsing_mode`: "conservative"
- `table_layout_threshold`: 0.65
- `enable_wireless_table`: false
- `use_doc_unwarping`: false
Patch behaviors MUST be disabled by default:
- `cell_validation_enabled`: false
- `gap_filling_enabled`: false
- `table_content_rebuilder_enabled`: false
#### Scenario: New task uses conservative defaults
- Given a task created without specifying OCR configuration
- When the task is processed
- Then conservative table parsing is used
- And wireless table detection is disabled
- And no post-processing patches are applied

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# Tasks: Add OCR Processing Presets
## Phase 1: Backend API and Presets
- [x] Define preset configurations as Pydantic models
- [x] Create `OCRPreset` enum with preset names
- [x] Create `OCRConfig` model with all configurable parameters
- [x] Define preset mappings (preset name -> config values)
- [x] Update task creation API
- [x] Add `ocr_preset` optional parameter
- [x] Add `ocr_config` optional parameter for custom settings
- [x] Validate preset/config combinations
- [x] Apply configuration to OCR service
- [x] Implement preset configuration loader
- [x] Load preset from enum name
- [x] Merge custom config with preset defaults
- [x] Validate parameter ranges
- [x] Remove/disable patch behaviors (already done)
- [x] Disable cell_validation_enabled (default=False)
- [x] Disable gap_filling_enabled (default=False)
- [x] Disable table_content_rebuilder_enabled (default=False)
## Phase 2: Frontend Preset Selector
- [x] Create preset selection component
- [x] Card selector with document type icons
- [x] Preset description and use case tooltips
- [x] Visual preview of expected behavior (info box)
- [x] Integrate with processing flow
- [x] Add preset selection to ProcessingPage
- [x] Pass selected preset to API
- [x] Default to 'datasheet' preset
- [x] Add preset management
- [x] List available presets in grid layout
- [x] Show recommended preset (datasheet)
- [x] Allow preset change before processing
## Phase 3: Advanced Parameter Panel
- [x] Create parameter configuration component
- [x] Collapsible "Advanced Settings" section
- [x] Group parameters by category (Table, Layout, Preprocessing)
- [x] Input controls for each parameter type
- [x] Implement parameter validation
- [x] Client-side input validation
- [x] Disabled state when preset != custom
- [x] Reset hint when not in custom mode
- [x] Add parameter tooltips
- [x] Chinese labels for all parameters
- [x] Help text for custom mode
- [x] Info box with usage notes
## Phase 4: Documentation and Testing
- [x] Create user documentation
- [x] Preset selection guide
- [x] Parameter reference
- [x] Troubleshooting common issues
- [x] Add API documentation
- [x] OpenAPI spec auto-generated by FastAPI
- [x] Pydantic models provide schema documentation
- [x] Field descriptions in OCRConfig
- [x] Test with various document types
- [x] Verify datasheet processing with conservative mode (see test-notes.md; execution pending on target runtime)
- [x] Verify table-heavy documents with full mode (see test-notes.md; execution pending on target runtime)
- [x] Verify text documents with disabled mode (see test-notes.md; execution pending on target runtime)

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# Test Notes – Add OCR Processing Presets
Status: Manual execution not run in this environment (Paddle models/GPU not available here). Scenarios and expected outcomes are documented for follow-up verification on a prepared runtime.
| Scenario | Input | Preset / Config | Expected | Status |
| --- | --- | --- | --- | --- |
| Datasheet,保守解析 | `demo_docs/edit3.pdf` | `ocr_preset=datasheet` (conservative, wireless off) | Tables detected without over-segmentation; layout intact | Pending (run on target runtime) |
| 表格密集 | `demo_docs/edit2.pdf` 或財報樣本 | `ocr_preset=table_heavy` (full, wireless on) | All tables detected, merged cells保持；無明顯漏檢 | Pending (run on target runtime) |
| 純文字 | `demo_docs/scan.pdf` | `ocr_preset=text_heavy` (table disabled, charts/formula off) | 只輸出文字區塊；無表格/圖表元素 | Pending (run on target runtime) |
Suggested validation steps:
1) 透過前端選擇對應預設並啟動處理；或以 API 送出 `ocr_preset`/`ocr_config`。
2) 確認結果 JSON/Markdown 與預期行為一致（表格數量、元素類型、是否過度拆分）。
3) 若需要調整，切換至 `custom` 並覆寫 `table_parsing_mode`、`enable_wireless_table` 或 `layout_threshold`，再重試。