距离选通切片图像高精度三维重构方法

High-Precision 3D Image Reconstruction Method By Range-Gated Slice Images

高精度水下三维成像可以获取更多的目标信息,有利于提高水下目标的识别率,一直是水下光电成像的重要研究方向之一。距离选通成像技术可以获取目标的距离信息,但由于选通深度的限制,难以直接从多幅选通图像重构出高精度的三维图像。在基本距离选通成像技术基础上,以较小的选通延迟时间间隔获取多幅距离选通切片图像,对这些图像的像素灰度值进行统计分析和曲线拟合,可以获取每个像素的距离值,从而重构出高精度的目标三维图像。理论分析表明,该方法的距离解算精度可能达到厘米级。

More target information may be obtained by high-precision underwater 3D imaging which helps improving the recognition rate of underwater target, and 3D imaging is one of the most important research areas for underwater optical imaging. Range gated imaging can acquire the distance information of targets, but it is difficult to reconstruct high-precision 3D image directly from the range-gated images because of the restriction of the gating depth. Based on the basic range-gated imaging technology, together with a smaller gate delay time interval, a series of range-gated slice images are obtained. After this, the distance value of each pixel can be calculated by statistically analyzing and curve fitting of pixel gray values of the obtained slice images. Finally, the high-precision 3D image of the target is reconstructed. Theoretical analysis shows that the distance resolution accuracy of this method can probably reach centimeter level.