Cambridge, Mass. - StopLift Checkout Vision Systems is introducing the Self-Checkout Accelerator, which is designed to immediately flag unscanned merchandise at the checkout and alert the attendant before the customer leaves the checkout, improve customer service at the self-checkout, and prevent false alerts and interventions.   Self-checkout companies such as NCR and Fujitsu have already been working with StopLift to directly integrate their self-checkouts with the Self-Checkout Accelerator system, which also prevents false alerts, e.g. a purse on the conveyor belt. StopLift's Scan-It-All...