基于激光全息投影的数字媒体图像三维重构方法

3D reconstruction of digital media image based on laser holographic projection

数字媒体图像形态多为不规则,增加了微小细节的采集难度,导致其三维重构质量下降,因此提出基于激光全息投影的数字媒体图像三维重构方法。采用CCD摄像机与激光设备采集数字媒体图像,根据激光全息投影与衍射理论得到物光上各点相位与振幅,得到包含微小信息的激光全息投影图像。针对投影过程中产生散斑噪声,运用复合波片、毛玻璃调制物光相位,抑制光源的相干性,去除图像上噪声。采用包围盒算法获得光线射入物体的三维空间坐标,利用欧拉-拉格朗日方程建立图像三维重构数据场,实现数字媒体图像的三维重构。实验结果表明,所提方法能够有效去除重构过程中的噪声,保证重构后图像清晰度,降低了数字媒体图像三维重构的误差,缩短了重构的时间,所提出方法的重构均方误差最大不超过0.5,重构时间在10 s内。

The shape of digital media images is often irregular,which increases the difficulty of collecting small details and leads to a decrease in the quality of their 3D reconstruction.Therefore,a 3D reconstruction method for dig-ital media images based on laser holographic projection is proposed.Using CCD cameras and laser equipment to collect digital media images,the phase and amplitude of each point on the object light are obtained based on laser holographic projection and diffraction theory,and a laser holographic projection image containing small information is obtained.In view of the speckle noise generated in the projection process,the compound wave plate and Frosted glass are used to modulate the phase of the object light,suppress the coherence of the light source,and remove the noise on the image.The bounding box algorithm is used to obtain the three-dimensional spatial coordinates of the light entering the object,and the Euler Lagrange equation is used to establish a three-dimensional reconstruction data field for the image,achie-ving the three-dimensional reconstruction of digital media images.The experimental results show that the proposed method can effectively remove noise during the reconstruction process,ensure the clarity of the reconstructed image,reduce the error of 3D reconstruction of digital media images,and shorten the reconstruction time.The maximum re-construction mean square error of the proposed method does not exceed 0.5,and the reconstruction time is within 10 seconds.