When sourcing book scanners, prioritize high-resolution CMOS sensors (typically 18MP to 24MP) to ensure text clarity for OCR. Look for overhead (V-shaped or flat) scanning structures that prevent damage to the book spine. Essential features include flattening curve technology, fingerprint removal algorithms, and auto-focus capabilities. For high-volume digitization, ensure the scanning speed is at least 1.5 seconds per page and that the device supports multiple output formats such as PDF, Word, and searchable Excel.