Shrink wrap product sleeve is placed onto the bottle before entering into a steam tunnel. Occasionally the shrink wrap label is not in the correct position or gets snagged. This causes an unaesthetic package that is not suitable for retail. Each bottle must be manually inspected prior to filling. Shrink wrap colors are anything across the rainbow and many shades in between, including shades of white placed on a white bottle.
The bottle is side belt transfered to an exit conveyor and the bottle is inspected with a GigE camera. Using a combination of UV and white LED lighting, along with a specialty cut filter, the UV lighting causes a blue shift in the color of the product sleeve, while the color of the white bottle appear to be grey. Due to the reliability with traditional color segmentation working with greys, an in-house custom color segmentation routine was used to segment the exposed bottom of bottle that is not covered by the product sleeve. This allowed bottle to be profiled and measured, allowing for a quantitative pass/fail decision.