A comparison of the correspondence assignment quality between the fringe projection and band-limited pattern projection method

In recent years, the need for rapid surface measurements has grown due to the availability of industrial grade cameras with 1500 Hz (VGA resolution) at moderate cost. Due to the lack of suitable projection devices, which are able to create high-qualitiy illumination sequences at this rate, we developed and presented a fast surface measurement scheme based on band-limited pattern projection last year. In order to evaluate if the method is feasible for industrial inspection a comparison to existing methods has been conducted. We compared the achievable correspondence accuracy of the fringe projection plus gray code method to the approach of a band-limited pattern sequence projection as well as to our approach of fixed-pattern projection. The results of this comparison are discussed and the crucial parameters for the illumination pattern design are given. Media will substantiate the results shown.