With the development of display technology, people can get immersive experience and more realistic stereoscopic visual enjoyment from three-dimensional (3D) display. In order to improve the imaging quality, the collimating backlight integral imaging system can converge the divergence angle of pixel light, effectively reduce the tendency of voxel diffusion behind the central depth plane, thereby reducing the size of reconstructed voxels and improving the resolution of the system. However, the light propagation of collimating backlight system is different from the traditional scattering backlight system. There is deviation compared the light propagation path of both system, which leads to the pixel mapping error of the sampling light, and then induce voxel drift and aliasing. Therefore, in this paper, we propose a precise method to generate elemental image array. By combining reverse ray tracing technology, we establish the ray propagation geometry of the collimating backlight system, re-determine the starting point and direction of the sampling ray, and reversely track each rayed, so that the information of each ray is correctly mapped to the corresponding pixel. The experimental results show that the proposed method can effectively correct the light deviation, solve the problems of voxel drift and aliasing, and improve the imaging resolution of the system.