Natural 3-D images can be generated by displaying high-density directional images. The 3-D camera technique that generates high-density directional images can be implemented by interpolating images that were captured by a horizontally-aligned camera array using image-based rendering techniques. Three cameras in the camera array that was located in front of an object were used to obtain right- and left-side depth maps of the object. Using these depth maps in the image interpolation process enabled us to fix the camera pitch independently of the depth of the object. We found that when numerous cameras were aligned horizontally and the cameras in front of the object were selectively used, movements of the object in the horizontal and depth directions were allowed because the camera pitch did not have to be changed. The preliminary experimental results indicated that 64 directional images were generated from eight captured images.