HDR Image Generation Using Pixel Count Ratio Expansion

The patent extracts and removes the computationally intensive camera response function calculation step from the HDR merging process. By pre-calibrating the camera response function offline and only performing simple pixel value mapping during actual HDR merging, the method retains HDR image quality while dramatically reducing processing time and computational resource requirements.

The patent performs the complex camera response function calibration in advance during an offline preprocessing stage. This preliminary action stores the response characteristics in lookup tables, so that during real-time HDR merging, only simple value substitutions are needed rather than complex calculations, thus resolving the time-quality contradiction.

The patent separates the heavy computational task of camera response function calculation from the online processing stage. By extracting this function and pre-computing it offline, the method maintains measurement precision through accurate response characterization while eliminating the need for continuous high-power calculations during HDR merging, thus reducing power consumption.

The patent creates a simplified copy of the camera response function in the form of lookup tables that store pre-computed mapping relationships. Instead of performing complex calculations for each frame, the system copies and applies these pre-stored values, maintaining accuracy while minimizing computational energy expenditure during real-time operation.