59 lines
2.2 KiB
Markdown
59 lines
2.2 KiB
Markdown
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# PDF Validation Requirements
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## Overview
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Before documents are sent to AWS Textract for text extraction, the system performs several validation checks to ensure the PDF files meet Textract's requirements and can be processed successfully.
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## Validation Checks
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### 1. File Type
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**Requirement**: Only PDF files are accepted.
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**What we check**: The file must have the MIME type `application/pdf`.
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### 2. File Readability
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**Requirement**: The PDF must be valid and readable.
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**What we check**: The system attempts to open and parse the PDF file. Corrupted or malformed PDFs will be rejected.
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### 3. File Size
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**Requirement**: Each page must be 5 MB or smaller.
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**What we check**: Every page in the PDF is validated individually. If any single page exceeds 5 MB, the document is rejected.
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**Why this matters**: This is a requirement imposed by AWS Textract for synchronous processing.
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### 4. Page Dimensions
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**Minimum**: 50 x 50 pixels
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**Maximum**: 10,000 x 10,000 pixels
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**What we check**: Each page's width and height must fall within this range.
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**Why this matters**: Pages that are too small may not contain readable content. Pages that are too large exceed Textract's processing limits.
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### 5. Image Resolution (DPI)
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**Minimum**: 72 DPI (dots per inch)
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**What we check**: Each page must have a resolution of at least 72 DPI for both width and height.
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**Why this matters**: Low-resolution documents may not produce accurate text extraction results. Documents scanned or created at lower resolutions should be re-scanned or regenerated at a higher quality.
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## Validation Failure Reasons
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When a document fails validation, the system records one of the following failure reasons:
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- `invalid_mimetype` - File is not a PDF
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- `invalid_read` - PDF is corrupted or cannot be opened
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- `invalid_read_pages` - One or more pages cannot be read
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- `zero_page_count` - PDF contains no pages
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- `large_file` - One or more pages exceeds 5 MB
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- `small_dimensions` - Page dimensions are too small (below 50x50 pixels)
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- `large_dimensions` - Page dimensions are too large (above 10,000x10,000 pixels)
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- `small_dpi` - Page resolution is below 72 DPI
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- `large_dpi` - Page resolution is too high (future use)
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