针对星空背景下的空间目标图像特点,提出了一种基于相机阵列的高动态范围图像合成方法。利用相机阵列系统获取空间同一区域的不同曝光图像,并以恒星质心为控制点,实现了不同相机间图像的配准;结合标定的各相机的逆响应函数,合理构建了权重函数,进而将配准后的不同曝光图像合成为一幅高动态范围图像。实验结果表明,合成后图像的动态范围有所增大,且该方法有效地提高了图像信噪比,克服了目标成像过暗和过饱和的问题,利于目标的检测与提取。

A high dynamic range image synthesis method based on camera array is proposed as for the characteristics of space target images in the sky background. The camera array system is used to obtain different exposure images in the same spatial area and the star centroid is used as the control point. Thus the registration of images among different cameras is realized. Combined with the inverse response function of each camera, the weight function is reasonably constructed, and the different exposure images after registration are thus combined into a high dynamic range image. The experimental results indicate that the dynamic range of the synthesized image is increased. The proposed method can be used to effectively improve the signal-to-noise ratio of images, which overcomes the problem of over-damping and over-saturation of target images and is conducive to the detection and extraction of targets.