OpenScan

OpenScan is a tool designed to digitize documents using mobile devices. The application captures images, processes them, and generates files in PDF or JPEG format. The project is available on GitHub under an open source license.

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• Image capture. This function allows you to take photos of documents using the device's camera. Images are temporarily stored for later processing. Capture is performed with autofocus settings.
• Edge processing. Automatically detects the edges of the document in the image. Uses computer vision algorithms to correct perspective and crop unwanted areas. Accuracy depends on the quality of the original image.
• Contrast adjustment. Modifies brightness and contrast levels to improve text readability. The function applies filters to reduce noise and highlight characters. It can be adjusted manually if necessary.
• Perspective correction. Transforms the image to simulate flat scanning. Corrects distortions caused by non-perpendicular capture angles. The result is a rectified document ready for export.
• Export to PDF. Converts processed images into single or multi-page PDF files. Allows you to select compression quality and page size. Basic metadata can be edited before saving.
• Export to JPEG. Saves processed images in JPEG format with adjustable quality. Supports configurable resolution to balance size and sharpness. Ideal for sharing documents via digital media.
• Page organization. Allows reordering, rotating, or deleting pages before exporting. The interface shows thumbnails for visual document management. Changes are applied in real time.
• Batch mode. Scans multiple documents in a single session. Each capture is processed individually and added to a queue. Once the process is finished, all pages are exported into a single file.
• Monochrome filters. Converts images to grayscale or black and white. Optimizes text documents by reducing file size. Filter intensity is configurable.
• OCR support. Integrates optical character recognition to extract text. The results are included in PDF files as searchable text layers. Requires additional configuration of external libraries.
• Manual focus. Allows you to adjust the focus point before capturing the image. Useful for documents with textures or complex backgrounds. Includes visual guide assistance.
• Scan history. Temporarily stores recent jobs for reuse. Non-exported projects can be recovered in later sessions. Local storage has a capacity limit.

The first version of OpenScan was published in 2020 by Ethereal Developers. The project is written in Java and Kotlin for Android compatibility. Updates include improvements in processing algorithms and new export functions. Development continues with contributions from the open source community.

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