Highlight Texts for Debugging

VBC#

using IronOcr;

IronTesseract ocrTesseract = new IronTesseract();

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

Imports IronOcr

Dim ocrTesseract As New IronTesseract()

Using ocrInput As New OcrInput()
    ocrInput.LoadPdf("document.pdf")
    ocrInput.HighlightTextAndSaveAsImages(ocrTesseract, "highlight_page_", ResultHighlightType.Paragraph)
End Using

PM > Install-Package IronOcr

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.Words (or .Lines, .Paragraphs) yields collections whose elements expose X/Y/Width/Height for each detected region.
StampCropRectanglesAndSaveAs(...) visualizes those rectangles and writes images to disk

Explore Computer Vision Techniques with IronOCR

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