I plan to build a [linear book scanner](https://linearbookscanner.org/ https://linearbookscanner.org/) someday. I admit it doesn't satify OP's concern though, a

I plan to build a [linear book scanner](https://linearbookscanner.org/ https://linearbookscanner.org/) someday. I admit it doesn't satify OP's concern though, at it uses two upward-facing flatbed scanners, rather than consumer cameras.