A technique for deriving the camera response function using image blur

A technique for deriving the camera response function using the image blur information is presented. One or more defocused images captured by a camera are used for the parameter estimation. The proposed method takes the linear brightness change of a single captured image to estimate the camera response. Using the information provided by the RAW and JPEG file formats, the intensity conversion parameter can also be derived by the comparison of linear and nonlinear coded images. Furthermore, multiple image captures with different exposures are incorporated to increase the robustness of the camera response function estimation. The experiments have demonstrated the feasibility of the proposed technique.