Highlight Texts for Debugging

VB C#

using IronOcr;

IronTesseract ocrTesseract = new IronTesseract();

using var ocrInput = new OcrInput();
ocrInput.LoadPdf("document.pdf");
ocrInput.HighlightTextAndSaveAsImages(ocrTesseract, "highlight_page_", ResultHighlightType.Paragraph);

Imports IronOcr

Private ocrTesseract As New IronTesseract()

Private ocrInput = New OcrInput()
ocrInput.LoadPdf("document.pdf")
ocrInput.HighlightTextAndSaveAsImages(ocrTesseract, "highlight_page_", ResultHighlightType.Paragraph)

Install-Package IronOcr

Highlight Texts for Debugging

IronOCR includes built‑in support to visually highlight OCR-detected elements (characters, words, lines, or paragraphs) on images or pages, and export them as PNGs for debugging.

OCR-based region detection replaces manual rectangle definitions
HighlightTextAndSaveAsImages(ocr, prefix, highlightType) overlays red boxes around detected elements — paragraphs, lines, words, or characters — and saves each page as an image.
Uses ResultHighlightType to choose what to highlight: Character, Word, Line, or Paragraph.
Handles detection and drawing internally — much simpler than manually specifying rectangle coordinates.

Optional Manual Approach via `StampCropRectangles`

If you want to manually handle bounding boxes from OCR results:

result.WordBounds (or .LineBounds, .ParagraphBounds) yields Rectangle[] with detected regions.
StampCropRectanglesAndSaveAs(...) visualizes those rectangles and writes images to disk

Explore Computer Vision Techniques with IronOCR