---
title: "VisionEngine"
canonical_url: "https://www.nutrient.io/api/csharp/enums/vision-engine/"
md_url: "https://www.nutrient.io/api/csharp/enums/vision-engine.md"
last_updated: "2026-10-08T08:55:57.709Z"
description: "Specifies which vision processing pipeline to use for content extraction."
---

Specifies which vision processing pipeline to use for content extraction.

ICR (Intelligent Content Recognition) refers to intelligent document understanding that goes beyond traditional OCR. While OCR simply converts images of text into machine-readable characters, ICR analyzes the full document structure.

```csharp

using Nutrient;

```

## Values

| Name                          | Value | Description                                                                     |
| ----------------------------- | ----- | ------------------------------------------------------------------------------- |
| `VisionEngine.VlmEnhancedIcr` | `0`   | VLM-enhanced ICR extraction pipeline combining ICR with Vision Language Models. |
| `VisionEngine.AdaptiveOcr`    | `1`   | Adaptive OCR pipeline: heuristic-first with OCR fallback per page.              |
| `VisionEngine.Icr`            | `2`   | Local ICR extraction pipeline using only small models (no VLM required).        |
| `VisionEngine.Auto`           | `3`   | Automatically selects the extraction pipeline independently for each page.      |

---

## Related pages

- [Enums](/api/csharp/enums.md)
- [Auto Tagging Engine](/api/csharp/enums/auto-tagging-engine.md)
- [Description Level](/api/csharp/enums/description-level.md)
- [Document Bookmark Source](/api/csharp/enums/document-bookmark-source.md)
- [Document Format](/api/csharp/enums/document-format.md)
- [Document Markup Mode](/api/csharp/enums/document-markup-mode.md)
- [Document Type](/api/csharp/enums/document-type.md)
- [Execution Provider](/api/csharp/enums/execution-provider.md)
- [Form Vlm Enrichment Model](/api/csharp/enums/form-vlm-enrichment-model.md)
- [Html Layout Type](/api/csharp/enums/html-layout-type.md)
- [Image Export Format](/api/csharp/enums/image-export-format.md)
- [Image Export Mode](/api/csharp/enums/image-export-mode.md)
- [Image Setting Mode](/api/csharp/enums/image-setting-mode.md)
- [Implicit Conversion](/api/csharp/enums/implicit-conversion.md)
- [Inline Style Reference Mode](/api/csharp/enums/inline-style-reference-mode.md)
- [Instant Json Render Theme](/api/csharp/enums/instant-json-render-theme.md)
- [Json Export Content](/api/csharp/enums/json-export-content.md)
- [Json Export Format](/api/csharp/enums/json-export-format.md)
- [Ocr Activation Mode](/api/csharp/enums/ocr-activation-mode.md)
- [Ocr Engine](/api/csharp/enums/ocr-engine.md)
- [Open Settings Mode](/api/csharp/enums/open-settings-mode.md)
- [Page Cache Mode](/api/csharp/enums/page-cache-mode.md)
- [Paper Normalization Mode](/api/csharp/enums/paper-normalization-mode.md)
- [Pdf Border Style](/api/csharp/enums/pdf-border-style.md)
- [Pdf Compression](/api/csharp/enums/pdf-compression.md)
- [Pdf Conformance](/api/csharp/enums/pdf-conformance.md)
- [Pdf Form Field Type](/api/csharp/enums/pdf-form-field-type.md)
- [Pdf Line Ending Style](/api/csharp/enums/pdf-line-ending-style.md)
- [Pdf Page Sizes](/api/csharp/enums/pdf-page-sizes.md)
- [Pdf Rubber Stamp Icon](/api/csharp/enums/pdf-rubber-stamp-icon.md)
- [Pdf Save Preferences](/api/csharp/enums/pdf-save-preferences.md)
- [Pdf Settings Mode](/api/csharp/enums/pdf-settings-mode.md)
- [Pdf Validation Conformance](/api/csharp/enums/pdf-validation-conformance.md)
- [Rendering Layout Mode](/api/csharp/enums/rendering-layout-mode.md)
- [Restoration Mode](/api/csharp/enums/restoration-mode.md)
- [Schema Compatibility](/api/csharp/enums/schema-compatibility.md)
- [Search Display](/api/csharp/enums/search-display.md)
- [Search Mode](/api/csharp/enums/search-mode.md)
- [Signature Certification Level](/api/csharp/enums/signature-certification-level.md)
- [Signature Format](/api/csharp/enums/signature-format.md)
- [Signature Hash Algorithm](/api/csharp/enums/signature-hash-algorithm.md)
- [Signature Key Source](/api/csharp/enums/signature-key-source.md)
- [Signature Level](/api/csharp/enums/signature-level.md)
- [Text Direction](/api/csharp/enums/text-direction.md)
- [Tiff Compression](/api/csharp/enums/tiff-compression.md)
- [Unit Mode](/api/csharp/enums/unit-mode.md)
- [Unparseable Output Handling](/api/csharp/enums/unparseable-output-handling.md)
- [Vision Features](/api/csharp/enums/vision-features.md)
- [Vision Output Format](/api/csharp/enums/vision-output-format.md)
- [Vlm Classification Strategy](/api/csharp/enums/vlm-classification-strategy.md)
- [Vlm Provider](/api/csharp/enums/vlm-provider.md)
- [Word Refining Method](/api/csharp/enums/word-refining-method.md)