# Holostereosynthesis: An Improvement to [PERSON]'s Photostereosynthesis Technique
## 3 Results
### Holostereosynthesis with CHIMERA Holographic Stereograms  
To realize holostereosynthesis using the CHIMERA holographic technique, we imported the eight photos into a 3D computer graphics program by positioning them on either side of the rotation axis (Figure 4a): four images in front and four behind. The photos maintained the same distance affected by a coefficient corresponding to the adopted scale in the 3D program. A series of 768 horizontal perspective images of the scene on a 120-degree arc of a circle (Figure 4b) was then generated for Photo 1 (Figure 4c), thanks to a virtual video camera rotating around the image. This operation was repeated for each of the other photos to obtain eight different sets of images. All images were then merged using in-house software to obtain a single file of 768 perspective images (Figure 4d and Supplementary Video S1).  
Hogels were generated from the perspective images and recorded sequentially into a 30 \(\times\) 40 cm U04 holographic plate with a CHIMERA holoprinter. When the CHIMERA hologram was illuminated by the RGB LED lamp, a fine black-and-white 3D reconstruction of [PERSON]'s head was obtained. Holostereosynthesis of the eight original photos was performed using a single hologram recording. The final 3D image was bright and protruded out of the frame, resembling a pulsed holographic portrait [21] (Figure 5a). With a resolution of 250 \(\upmu\)m, the hogel grid was invisible to the naked eye. The hologram had a narrow horizontal field of view of approximately 5\({}^{\circ}\), which allowed the 3D effect to be observed before the images separated and blurred (Figure 5b). Because the hologram was half parallax, the images did not shift when moving vertically, and observation of the 3D effect was easier. Furthermore, this CHIMERA hologram has a mastering quality and can be copied with the same RGB lasers to produce copies on both silver halide and photopolymer materials.  
Figure 3: Reconstruction of a portrait by photostereosynthesis. The original images (**a**) were realigned with a graphic editor (**b**) and then lightened (**c**) to reconstruct a photostereosynthetic portrait according to [PERSON]’s design. When this display was backlit, a translucent 3D image several centimeters thick was visible to an observer placed exactly in front (**d**).  
Figure 4: Perspective image generation from the set of the eight original photos using a 3D computer graphics program. Eight photographs were positioned on either side of the rotational axis (**a**). A series of 768 horizontal perspective images on a 120-degree arc of a circle (**b**) were then generated for Photo 1 (**c**) using a virtual camera. This operation was repeated for each photo, and all images were merged into a single file of 768 images (**d**).  
Figure 5: Holostereosynthesis with a CHIMERA hologram. The eight original photos were merged using holostereosynthesis in a single 30 \(\times\) 40 cm CHIMERA hologram. When illuminated by the RGB LED lamp, a fine black-and-white 3D reconstruction of [PERSON]’s head appeared (**a**). Upon moving horizontally by a few degrees, the different planes were separated (**b**).