개념 및 지식 허브
모바일 영수증 및 문서 스캐너 자동 보정
모바일 영수증 및 문서 스캐너 자동 보정
본 도구는 100% 클라이언트 환경(브라우저)에서 작동합니다. 사진, 동영상, 음성 또는 PDF 문서가 외부 서버로 절대 전송되지 않으며 로컬 메모리에서 안전하게 처리됩니다.
핵심 아키텍처 및 수학 공식
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.
모범 사례 및 필수 지침
- 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.
자주 묻는 질문 (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.