Form Field
PDF Form Field
An interactive element in a PDF that allows users to input data, such as text boxes, checkboxes, and dropdowns.
Technical Detail
Form Field works by analyzing pixel patterns in scanned or photographed text. Modern OCR engines like Tesseract use neural networks (LSTM architectures) trained on millions of character samples across hundreds of languages. The process involves binarization, skew correction, line segmentation, word segmentation, and character classification. Post-processing with language models and dictionaries improves accuracy beyond raw character recognition, typically achieving 95-99% accuracy on clean printed text.
Example
```javascript
// Fill PDF form fields
const form = pdf.getForm();
form.getTextField('name').setText('Jane Doe');
form.getCheckBox('agree').check();
form.getDropdown('country').select('United States');
// Flatten form (make fields non-editable)
form.flatten();
```
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