High Dynamic Range Image Compositing Based On SoC-FPGA

In our daily life, human can see colorful scene of the nature, but imaging equipment such as camera is unable to completely restore the scene which observed by human. In order to obtain high dynamic range images, present research is still focus on the software algorithms' optimization, research in the field for high dynamic range images of real-time compositing hardware research in the field is less.For this reason, this article will focus on the hardware research of high dynamic range images of real-time compositing.This paper focus on the high dynamic range image fusion algorithm which based on So C-FPGA. Through comparison and analysis the results of different image fusion algorithms which based on software, a quality and feasible algorithm is selected for hardware implementation. In this paper. Research is focus on the fusion algorithm which is based on the camera response curve. So we need to work out the response curve of camera. The fusion algorithm which this paper process only had been realized through software, with the change of the intensity, we need to reset the exposure time for better results. All of this are difficult to implemented in hardware, and have not tested on the So C-FPGA architectures.Numerous fusion algorithms, such as image block fusion algorithm, brightness mapping function, Debevec's fusion algorithm and so on. By verifying these algorithms and compare the result from imaging effect, dynamic range and computation complexity, we conclude that Debevec's fusion algorithm which is based on the camera response curve is better than the other algorithms. The research of real-time high-dynamic-range image fusion is less. To reduce the computation complexity of floating point calculation and function mapping, this paper uses the look-up table structure to store the calibrated response curve, which optimize the design of Devevec's algothrim. This paper design a double FIFO structure to buffer three frame image which is captured from TRDB_D5M camera and use these three image data to compositing an HDR image.The fused image which obtained with the control of HPS and FPGA,the imaging results is better,and the dynamic range is up to 90 d B,as the dynamic range of TRDB-D5 M is 72 d B. All the work this article does which based on high dynamic range image synthesis provides valuable assistance with the implemention and promotion of high dynamic synthesis algprithms on hardware architexture.