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针对组合四相机拼接影像的亮度差异,提出一种颜色平衡方法。首先,通过相机检校获取相机的辐射响应函数。然后,建立各子相机的颜色模型函数,并依据相邻子影像之间重叠区的亮度信息,通过稳健性估计获取各子影像之间的曝光量差值,完成各子影像之间的颜色差异纠正。最后,定义一个线性权函数,使拼接线附近的影像实现平衡过渡。实验结果表明,该方法能够有效消除各子影像之间的曝光量差异,保证拼接影像颜色均衡,没有明显分界。
Aiming at the difference of brightness between the combined four camera images, a color balance method is proposed. First, obtain the camera’s radiation response function by camera calibration. Then, the color model functions of each sub-camera are established. Based on the brightness information of the overlapping regions between adjacent sub-images, the difference in exposure amount between the sub-images is obtained through the robustness estimation, and the color difference between the sub-images is achieved correct. Finally, we define a linear weight function to make the image near the splicing line achieve a balanced transition. Experimental results show that this method can effectively eliminate the difference of exposure between sub-images and ensure the color balance of the mosaic images without obvious boundaries.