ナレッジハブ・技術ガイド
ドキュメントスキャナー・レシート・書類補正
ドキュメントスキャナー・レシート・書類補正
本ツールは100%クライアントサイド（ブラウザ内）で動作します。写真、動画、音声、PDFファイルが外部サーバーにアップロードされることは一切なく、お使いの端末のメモリ内で安全に処理されます。
コアアーキテクチャ & 計算式
Clean Scan = Edge Detection ➔ Perspective Warp ➔ Grayscale Conversion ➔ Adaptive Thresholding
The scanner first uses the Canny Edge Detection algorithm to find the 4 corners of the paper. It then applies a perspective warp to flatten the image, and finally uses adaptive thresholding to turn gray shadows into pure white.
ベストプラクティスとガイドライン
- Ensure High Contrast Backgrounds: A white piece of paper on a white table is a mathematical nightmare for edge detection. Always place the document on a dark table so the algorithm can instantly find the 4 corners.
- Avoid Harsh Glare: If you scan glossy paper under a bright light, the glare will blow out the pixels to pure white, completely destroying the underlying text. Use diffused, indirect lighting.
- Use B&W Binarization for Text: If the document is purely text (like a contract), always use the 'Black & White' filter. It mathematically removes all colored noise and shadows, drastically reducing the final PDF file size.
よくある質問 (FAQ)
Why did the scanner warp my document incorrectly?
If the algorithm selects the wrong 4 corners, the resulting warp will severely distort the image. Always use the manual corner adjustment handles to ensure the crop box perfectly aligns with the paper.
Can I scan multiple pages into one file?
Yes. Professional scanning workflows allow you to process multiple images sequentially and batch them into a single, multi page PDF document.
Does this tool read the text?
No. A scanner simply creates a flat image. To extract the actual text strings for editing, you must pass the resulting scan through an Optical Character Recognition (OCR) engine.