PHASE 1 — DOCUMENT TYPE CLASSIFICATION Document Type Invoice Confidence 🟢 High Supporting Evidence TAX INVOlCE lnvoice No lnvoice Date Due Date BILL TO Itemized product table Subtotal Discount CGST and SGST Grand Total Payment Method The document has multiple independent indicators of an invoice. Result Classification: Valid --- PHASE 2 — OCR TEXT CLEANING The OCR contains several obvious character substitutions. Raw OCR Cleaned Value Reason INVOlCE INVOICE l → I ELECTRONlCS ELECTRONICS l → I lnvoice No Invoice No OCR capitalization/substitution lnvoice Date Invoice Date OCR substitution Keybord Keyboard Obvious word corruption HDMl HDMI OCR character substitution Sub Tota1 Subtotal 1 → l Taxab1e Amount Taxable Amount 1 → l Grand Tota1 Grand Total 1 → l Ba1ance Due Balance Due 1 → l Important The system should not blindly correct every suspicious character. For example: TN-INV-2026-00871 is preserved because the value is an invoice identifier and the digits are structurally valid. Cleaning Result 🟢 Cleaned successfully --- PHASE 3 — DOCUMENT STRUCTURE RECONSTRUCTION The OCR is already mostly ordered, but the logical business structure is reconstructed as follows: DOCUMENT │ ├── Header │ ├── Vendor Name │ ├── Vendor Address │ ├── Vendor GSTIN │ └── Vendor Phone │ ├── Document Metadata │ ├── Invoice Number │ ├── Invoice Date │ ├── Due Date │ └── PO Number │ ├── Customer │ ├── Customer Name │ ├── Customer Address │ └── Customer GSTIN │ ├── Line Items │ ├── Wireless Mouse │ ├── USB Keyboard │ ├── HDMI Cable │ └── Laptop Stand │ ├── Financial Section │ ├── Subtotal │ ├── Discount │ ├── Taxable Amount │ ├── CGST │ ├── SGST │ ├── Grand Total │ ├── Paid │ └── Balance Due │ ├── Payment │ ├── Payment Method │ └── Currency │ └── Footer └── Thank-you message Result 🟢 Structure reconstructed successfully --- PHASE 4 — FIELD DISCOVERY Field Raw Value Normalized Value Confidence Status Invoice Number TN-INV-2026-00871 TN-INV-2026-00871 🟢 High ✅ Valid Vendor TECHNOVA ELECTRONlCS PVT. LTD. TECHNOVA ELECTRONICS PVT. LTD. 🟢 High ✅ Valid Customer ROYAL RETAIL MART ROYAL RETAIL MART 🟢 High ✅ Valid Invoice Date 02/09/2026 2026-09-02 🟢 High ✅ Valid Due Date 17/09/2026 2026-09-17 🟢 High ✅ Valid PO Number PO-45821 PO-45821 🟢 High ✅ Valid Vendor GSTIN 19AABCT1234K1Z8 19AABCT1234K1Z8 🟢 High ✅ Valid Customer GSTIN 19AAECR5678P1Z4 19AAECR5678P1Z4 🟢 High ✅ Valid Vendor Phone +91 98765 43210 +919876543210 🟢 High ✅ Valid Payment Method UPI UPI 🟢 High ✅ Valid Currency INR INR 🟢 High ✅ Valid --- PHASE 5 — HEADER & ENTITY EXTRACTION Vendor Raw: TECHNOVA ELECTRONlCS PVT. LTD. Normalized: TECHNOVA ELECTRONICS PVT. LTD. Confidence: 🟢 High Evidence: Appears in document header before GSTIN and phone number. Vendor Address Shop No. 18, City Centre, Durgapur, West Bengal 713216 Confidence: 🟢 High Vendor GSTIN 19AABCT1234K1Z8 Confidence: 🟢 High Vendor Phone Raw: +91 98765 43210 Normalized: +919876543210 Confidence: 🟢 High Customer ROYAL RETAIL MART Confidence: 🟢 High Evidence: Appears immediately after BILL TO. Customer GSTIN 19AAECR5678P1Z4 Confidence: 🟢 High Invoice Number TN-INV-2026-00871 Confidence: 🟢 High PO Number PO-45821 Confidence: 🟢 High --- PHASE 6 — NUMBER & AMOUNT EXTRACTION Extracted Financial Values Field Raw Value Normalized Subtotal 5,194.00 5194.00 Discount 194.00 194.00 Taxable Amount 5,000.00 5000.00 CGST 450.00 450.00 SGST 450.00 450.00 Grand Total 5,900.00 5900.00 Paid 2,000.00 2000.00 Balance Due 3,900.00 3900.00 Currency Explicitly stated: Currency: INR Therefore: Normalized currency: INR No currency assumption was required. --- PHASE 7 — LINE-ITEM & TABLE RECONSTRUCTION Four line items are detected. Item 1 Description: Wireless Mouse Quantity: 2 Unit Price: 749.50 Line Total: 1,499.00 Validation: 2 × 749.50 = 1,499.00 ✅ Valid --- Item 2 Raw Description: USB Keybord Normalized Description: USB Keyboard Quantity: 1 Unit Price: 1,199.00 Line Total: 1,199.00 Validation: 1 × 1,199.00 = 1,199.00 ✅ Valid OCR correction: Keybord → Keyboard Confidence: 🟢 High --- Item 3 Raw Description: HDMl Cable Normalized Description: HDMI Cable Quantity: 3 Unit Price: 399.00 Line Total: 1,197.00 Validation: 3 × 399.00 = 1,197.00 ✅ Valid --- Item 4 Description: Laptop Stand Quantity: 1 Unit Price: 1,299.00 Line Total: 1,299.00 Validation: 1 × 1,299.00 = 1,299.00 ✅ Valid --- PHASE 8 — VALUE NORMALIZATION Dates Raw: 02/09/2026 Normalized: 2026-09-02 Raw: 17/09/2026 Normalized: 2026-09-17 Currency INR → INR Amounts 5,194.00 → 5194.00 194.00 → 194.00 5,000.00 → 5000.00 5,900.00 → 5900.00 Phone +91 98765 43210 → +919876543210 Tax CGST @ 9% → 9.0% SGST @ 9% → 9.0% Result 🟢 Normalization successful --- PHASE 9 — ENTITY & SEMANTIC DISAMBIGUATION Several OCR substitutions require interpretation. Case 1: INVOlCE Possible interpretation: INVOlCE INVOICE Context strongly supports: INVOICE 🟢 High confidence --- Case 2: Keybord Context: USB Keybord This is clearly intended to represent: USB Keyboard 🟢 High confidence --- Case 3: HDMl Context: HDMl Cable Common electronics terminology strongly supports: HDMI Cable 🟢 High confidence --- Case 4: Tota1 Context: Grand Tota1 The final 1 is interpreted as lowercase l. Normalized: Grand Total 🟢 High confidence --- Case 5: Financial numbers No ambiguous numeric substitutions were found in the financial fields. The numbers also pass independent arithmetic checks. Therefore, no financial value needs human interpretation. --- PHASE 10 — DATA VALIDATION Check 1 — Quantity × Unit Price Wireless Mouse: 2 × 749.50 = 1,499.00 ✅ Valid USB Keyboard: 1 × 1,199.00 = 1,199.00 ✅ Valid HDMI Cable: 3 × 399.00 = 1,197.00 ✅ Valid Laptop Stand: 1 × 1,299.00 = 1,299.00 ✅ Valid --- Check 2 — Subtotal 1,499 + 1,199 + 1,197 + 1,299 = 5,194 OCR subtotal: 5,194 ✅ Valid --- Check 3 — Taxable Amount Subtotal - Discount 5,194 - 194 = 5,000 OCR taxable amount: 5,000 ✅ Valid --- Check 4 — CGST + SGST 450 + 450 = 900 Total tax: 900 ✅ Valid --- Check 5 — Grand Total Taxable Amount + Total Tax 5,000 + 900 = 5,900 OCR Grand Total: 5,900 ✅ Valid --- Check 6 — Paid + Balance 2,000 + 3,900 = 5,900 Invoice Total: 5,900 ✅ Valid --- Check 7 — Date Consistency Invoice Date: 2026-09-02 Due Date: 2026-09-17 Invoice Date ≤ Due Date ✅ Valid --- PHASE 11 — CROSS-FIELD CONSISTENCY Relationship 1 Subtotal - Discount = Taxable Amount 5,194 - 194 = 5,000 ✅ Passed Relationship 2 CGST + SGST = Total Tax 450 + 450 = 900 ✅ Passed Relationship 3 Taxable Amount + Tax = Total 5,000 + 900 = 5,900 ✅ Passed Relationship 4 Paid + Balance = Total 2,000 + 3,900 = 5,900 ✅ Passed Relationship 5 Quantity × Unit Price = Line Total All four line items pass. ✅ Passed Duplicate Field Check No conflicting duplicate values detected. ✅ Passed --- PHASE 12 — CONFIDENCE SCORING Overall Confidence 🟢 High Category Confidence Document Type 🟢 High Vendor 🟢 High Customer 🟢 High Invoice Number 🟢 High Dates 🟢 High GSTINs 🟢 High PO Number 🟢 High Phone 🟢 High Line Items 🟢 High Financial Values 🟢 High Currency 🟢 High Payment Method 🟢 High Why High? Clear document labels Strong field-to-value proximity Clear invoice structure All arithmetic checks pass Currency explicitly provided OCR errors are recognizable and contextually resolvable No conflicting duplicate values --- PHASE 13 — ERROR & ANOMALY DETECTION Detected OCR Anomalies 1. INVOlCE → INVOICE 2. ELECTRONlCS → ELECTRONICS 3. lnvoice → Invoice 4. Keybord → Keyboard 5. HDMl → HDMI 6. Sub Tota1 → Subtotal 7. Taxab1e → Taxable 8. Grand Tota1 → Grand Total 9. Ba1ance → Balance Missing Fields None among the requested fields. Contradictory Values None. Suspicious Totals None. Broken Line Items None. Impossible Values None. --- PHASE 14 — EXTRACTION QUALITY AUDIT Requested Field Coverage 20/20 requested fields attempted and extracted. OCR Correction Quality 🟢 High All corrected words have strong contextual evidence. Line-Item Reconstruction 🟢 High All four rows have valid quantity × price calculations. Financial Validation 🟢 Passed All major financial relationships are mathematically consistent. Uncertainty Handling 🟢 Passed No ambiguous field was silently converted into a definitive value without supporting evidence. Invention Check 🟢 Passed No unsupported business information was added. Missing Fields None Low-Confidence Fields None Validation Failures None Extraction Quality Score 99/100 The one-point deduction is due to the presence of multiple OCR corruptions requiring normalization, even though they were successfully resolved. --- PHASE 15 — OUTPUT SCHEMA GENERATION The final schema should separate: Document metadata Vendor Customer Line items Financial information Payment information Validation Confidence Anomalies Review requirements This makes the result suitable for: API responses Databases ETL pipelines Accounting systems ERP integration Automated invoice processing Schema Design document ├── type ├── extraction_status ├── confidence └── quality_score vendor ├── name ├── address ├── gstin └── phone customer ├── name ├── address └── gstin metadata ├── invoice_number ├── invoice_date ├── due_date └── po_number line_items[] ├── description ├── quantity ├── unit_price ├── line_total ├── confidence └── validation_status financial_summary ├── subtotal ├── discount ├── taxable_amount ├── cgst ├── sgst ├── total_tax ├── total ├── paid ├── balance_due └── currency payment └── method validation ├── passed_checks ├── failed_checks ├── warnings └── uncertain_fields review_required[] anomalies[] --- PHASE 16 — FINAL STRUCTURED EXTRACTION 📄 DOCUMENT SUMMARY Document Type: Invoice Extraction Status: Successfully Extracted Overall Confidence: 🟢 High Extraction Quality Score: 99/100 🎯 EXTRACTED FIELDS Field Raw OCR Normalized Status Invoice Number TN-INV-2026-00871 TN-INV-2026-00871 ✅ Valid Vendor TECHNOVA ELECTRONlCS PVT. LTD. TECHNOVA ELECTRONICS PVT. LTD. ✅ Valid Customer ROYAL RETAIL MART ROYAL RETAIL MART ✅ Valid Invoice Date 02/09/2026 2026-09-02 ✅ Valid Due Date 17/09/2026 2026-09-17 ✅ Valid PO Number PO-45821 PO-45821 ✅ Valid Vendor GSTIN 19AABCT1234K1Z8 19AABCT1234K1Z8 ✅ Valid Customer GSTIN 19AAECR5678P1Z4 19AAECR5678P1Z4 ✅ Valid Vendor Phone +91 98765 43210 +919876543210 ✅ Valid Payment Method UPI UPI ✅ Valid Currency INR INR ✅ Valid 📦 LINE ITEMS Description Qty Unit Price Line Total Confidence Wireless Mouse 2 749.50 1499.00 🟢 High USB Keyboard 1 1199.00 1199.00 🟢 High HDMI Cable 3 399.00 1197.00 🟢 High Laptop Stand 1 1299.00 1299.00 🟢 High 💰 FINANCIAL SUMMARY Subtotal: 5194.00 Discount: 194.00 Taxable Amount: 5000.00 CGST: 9% = 450.00 SGST: 9% = 450.00 Total Tax: 900.00 Shipping/Fees: null Total: 5900.00 Paid: 2000.00 Balance: 3900.00 Currency: INR 🧪 VALIDATION RESULTS Passed Checks ✅ All required fields extracted ✅ All four line-item calculations ✅ Subtotal calculation ✅ Discount calculation ✅ Taxable amount calculation ✅ CGST + SGST calculation ✅ Grand total calculation ✅ Paid + balance calculation ✅ Invoice date and due date consistency ✅ Currency consistency ✅ No conflicting duplicate values Failed Checks None Warnings ⚠️ Multiple OCR character substitutions detected. ⚠️ Product names required contextual OCR correction. Uncertain Fields None ⚠️ REVIEW REQUIRED No human verification required. All requested fields have sufficient evidence and pass cross-field validation. 📦 FINAL MACHINE-READABLE JSON { "document": { "type": "invoice", "extraction_status": "success", "classification_confidence": "high", "overall_confidence": "high", "quality_score": 99 }, "vendor": { "name": { "raw": "TECHNOVA ELECTRONlCS PVT. LTD.", "normalized": "TECHNOVA ELECTRONICS PVT. LTD.", "confidence": "high", "status": "valid" }, "address": "Shop No. 18, City Centre, Durgapur, West Bengal 713216", "gstin": "19AABCT1234K1Z8", "phone": "+919876543210" }, "customer": { "name": "ROYAL RETAIL MART", "address": "23 Benachity Road, Durgapur, WB 713213", "gstin": "19AAECR5678P1Z4" }, "metadata": { "invoice_number": "TN-INV-2026-00871", "invoice_date": "2026-09-02", "due_date": "2026-09-17", "po_number": "PO-45821" }, "line_items": [ { "description": { "raw": "Wireless Mouse", "normalized": "Wireless Mouse" }, "quantity": 2, "unit_price": 749.50, "line_total": 1499.00, "confidence": "high", "validation_status": "valid" }, { "description": { "raw": "USB Keybord", "normalized": "USB Keyboard" }, "quantity": 1, "unit_price": 1199.00, "line_total": 1199.00, "confidence": "high", "validation_status": "valid", "ocr_correction": "Keybord -> Keyboard" }, { "description": { "raw": "HDMl Cable", "normalized": "HDMI Cable" }, "quantity": 3, "unit_price": 399.00, "line_total": 1197.00, "confidence": "high", "validation_status": "valid", "ocr_correction": "HDMl -> HDMI" }, { "description": { "raw": "Laptop Stand", "normalized": "Laptop Stand" }, "quantity": 1, "unit_price": 1299.00, "line_total": 1299.00, "confidence": "high", "validation_status": "valid" } ], "financial_summary": { "subtotal": 5194.00, "discount": 194.00, "taxable_amount": 5000.00, "cgst": { "rate": 9.0, "amount": 450.00 }, "sgst": { "rate": 9.0, "amount": 450.00 }, "total_tax": 900.00, "shipping_and_fees": null, "total": 5900.00, "paid": 2000.00, "balance_due": 3900.00, "currency": "INR" }, "payment": { "method": "UPI" }, "validation": { "status": "passed", "passed_checks": [ "Required fields present", "Quantity multiplied by unit price equals line total", "Subtotal equals sum of line totals", "Taxable amount equals subtotal minus discount", "CGST plus SGST equals total tax", "Taxable amount plus total tax equals total", "Paid amount plus balance due equals total", "Invoice date is before due date", "Currency is explicitly supported by document evidence" ], "failed_checks": [], "warnings": [ "OCR character substitutions detected", "Product descriptions required contextual correction" ], "uncertain_fields": [] }, "review_required": [], "anomalies": [ "INVOlCE -> INVOICE", "ELECTRONlCS -> ELECTRONICS", "lnvoice -> Invoice", "Keybord -> Keyboard", "HDMl -> HDMI", "Sub Tota1 -> Subtotal", "Taxab1e -> Taxable", "Grand Tota1 -> Grand Total", "Ba1ance -> Balance" ] } 🏁 FINAL TEST SCORECARD Phase Result Phase 1 — Classification ✅ Passed Phase 2 — OCR Cleaning ✅ Passed Phase 3 — Structure Reconstruction ✅ Passed Phase 4 — Field Discovery ✅ Passed Phase 5 — Entity Extraction ✅ Passed Phase 6 — Number & Amount Extraction ✅ Passed Phase 7 — Line-Item Reconstruction ✅ Passed Phase 8 — Normalization ✅ Passed Phase 9 — Disambiguation ✅ Passed Phase 10 — Validation ✅ Passed Phase 11 — Cross-Field Consistency ✅ Passed Phase 12 — Confidence Scoring ✅ Passed Phase 13 — Anomaly Detection ✅ Passed Phase 14 — Quality Audit ✅ Passed Phase 15 — Schema Generation ✅ Passed Phase 16 — Final Output ✅ Passed Overall Test Result: PASSED ✅ Key demonstration: The system successfully handled OCR corruption + semantic correction + structured extraction + line-item reconstruction + financial arithmetic validation + confidence scoring + anomaly reporting + machine-readable JSON, without inventing missing information.