Rapid exposure time estimation method for high-dynamic range surface

In structured light projection method, complex reflectivity distribution of high-dynamic range object surface is an important factor affecting the measurement accuracy. Image will be overexposed and underexposed with the complex reflectivity distribution of high-dynamic range object surface. Therefore, this paper proposed a method to estimate the reflectivity and exposure time distribution by only projecting two images with one exposure time. Then the optimal exposure time of different reflectivity region can be calculated accurately. The experiment result shows that the image quality is improved in the calculated exposure time, and the surface is reconstructed. It proved the proposed method is accurate and rapid in high-dynamic range surface measurement.