Abstract: A transparent film is used with a projector which emits a projected light. The transparent film includes a transparent substrate; a light-scattering layer disposed at an upstream position of the transparent substrate with respect to the projected light, and including a plurality of microstructures configured to scatter the projected light; and a light-blocking layer disposed at an upstream position of the light-scattering layer with respect to the projected light, and including a plurality of separate light-blocking units, which are configured to partially block the projected light and partially allow the projected light to reach the light-scattering layer.

Abstract: The present application provides an image projection system and a calibration method of projected image. The calibration method comprises: displaying an original image data as a first image having a first boundary characteristic; projecting the first image as a projected image; analyzing a difference between a boundary shape of the projected image and the first boundary characteristic which is unadjusted; according to the difference between the boundary shape of the projected image and the unadjusted first boundary characteristic, adjusting the first boundary characteristic until the boundary shape of the projected image is similar to the unadjusted first boundary characteristic; and recording the first boundary characteristic at the time when the boundary shape of the projected image is similar to the unadjusted first boundary characteristic as a second boundary characteristic, wherein the first boundary characteristic is the shape of at least one displaying boundary line around the first image.