A new type of light field display called a tensor display was investigated. Although this display consists of only a few light attenuating
layers located in front of a backlight, many views can be emitted in different directions simultaneously without sacrificing the resolution
of each view. The transmittance pattern of each layer is calculated from a light field, namely, a set of dense multi-view images (typically
dozens) that are to be observed from different directions. However, preparing such images is often cumbersome for real objects. We propose
a method that does not require multi-view images as the input; instead, a focal stack composed of only a few differently focused
images is directly transformed into the layer patterns. Our method greatly reduces the data acquisition cost while also maintaining the
quality of the output light field. We validated the method with experiments using synthetic light field datasets and a focal stack acquired
by an ordinary camera.