what i should learn before learning opencv

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Hi friends and experts! I studied physics in collage and have been working as a software engineer for ten years in communication industry , but recently i met some friends and found there are many chances to develop some products for factory which uses camera to detect product problems. i have no any background about computer image and vision process, do i need to study some basic theory before learning and using opencv to develop the projucts? if yes, could anyone introduce some good books for this.

Sorry for bad English discription.

Thanks very much!