Abstract: Disclosed herein is a method for encoding/decoding an immersive image, and the method for encoding an immersive image may include extracting an invalid region from an already encoded atlas and encoding a current atlas by referring to the invalid region.

Abstract: An image encoding method according to the present disclosure may include classifying a plurality of view images into a basic image and an additional image; performing pruning for at least one of the plurality of view images based on a result of the classification; generating an atlas based on a result of performing the pruning; and encoding the atlas and metadata for the atlas. In this case, the metadata may include spherical harmonic function information on a point in a three-dimensional space.

Abstract: An immersive image encoding method according to the present disclosure includes classifying a plurality of view images into a basic image and an additional image; performing pruning for at least one of the plurality of view images based on the classification result; generating a depth atlas based on a result of performing the pruning; and correcting an occupancy state of pixels in the depth atlas.

Abstract: The residual signal encoding and decoding method and apparatus based on a periodicity on phase signal are disclosed. One embodiment on a method for decoding an image, the method comprising: generating a prediction signal for a current signal, decoding an encoded residual signal from a bitstream, generating an initial reconstructed signal based on the prediction signal and the residual signal, and generating a transformed reconstructed signal by transforming a value of the initial reconstructed signal to have a size value of a preset range, wherein the generating of the transformed reconstructed signal generates the transformed reconstructed signal from the value of the initial reconstructed signal by using a clipping function with a minimum value of the preset range and a maximum value of the preset range as input values, and wherein the preset range is a period range of a signal.

Abstract: A method of processing an immersive video includes classifying each of a plurality of objects included in a view image as one of a first object group and a second object group, acquiring a patch for each of the plurality of objects, and packing patches to generate at least one atlas. In this instance, patches derived from objects belonging to the first object group may be packed in a different region or a different atlas from a region or an atlas of patches derived from objects belonging to the second object group.

Abstract: A method of processing an immersive video according to the present disclosure includes performing pruning for an input image, generating an atlas based on patches generated by the pruning and generating a cropped atlas by removing a background region of the atlas.

Abstract: A method of generating a hologram includes receiving an input image representing a 3D object, defining a first phase value for a first pixel data such that spatio-temporally identical pixels with respect to the input image have the same phase, defining a second phase value for a second pixel data such that spatio-temporally identical pixels with respect to the input image have the same phase, and generating a multi-view hologram using the first phase value and the second phase value.

Abstract: A method of encoding an immersive video according to the present disclosure includes determining whether an input image is a first type, converting the input image into the first type when the input image is a second type different from the first type, encoding a converted image, and generating metadata for the encoded image.

Abstract: Disclosed are a method and an apparatus for processing phase information. When receiving a phase image including phase information, a processing device performs phase remapping of mapping the phase image to a predetermined range. The predetermined range is a range of a first phase value to a second phase value having a period of 2?, and a difference between the first phase value and the second phase value is 2?.

Abstract: Disclosed herein is a method for piecewise linear scaling of a geometry atlas, the method including generating min-max normalized depth values and generating geometry atlases by scaling the depth values so as to correspond to the gradients of multiple linear intervals.

Abstract: A method of generating a hologram includes receiving an input image representing a 3D object, defining a first phase value for a first pixel data such that spatio-temporally identical pixels with respect to the input image have the same phase, defining a second phase value for a second pixel data such that spatio-temporally identical pixels with respect to the input image have the same phase, and generating a multi-view hologram using the first phase value and the second phase value.

Abstract: An apparatus for synthesizing ultra-high resolution computer generated holograms based on mesh propagates a plurality of 3D meshes constituting the 3D model to a hologram plane, divides an entire angular spectrum area corresponding to a set maximum diffraction angle into a plurality of partial angular spectral areas, sequentially calculates and accumulates angular spectrums of the plurality of 3D meshes for each of the plurality of partial angular spectrum areas, and generates holograms for the 3D model from the angular spectrums accumulated for each of the plurality of partial angular spectrum areas.

Abstract: Provided is a hologram generation method including receiving a distribution of a polygon and generating an angular spectrum based on the distribution of the polygon, determining whether a rotation angle of the polygon is included in a first section determined based on a maximum diffraction angle of a spatial light modulator, and recording the angular spectrum if it is determined that the rotation angle is included in the first section.

Abstract: Provided is a method for converting a hologram resolution of an apparatus for converting a hologram resolution. The apparatus for converting a hologram resolution includes receiving a hologram data and determining a direction and a height of an envelope for the hologram data based on first information associated with the hologram data. The apparatus for converting a hologram resolution includes converting the resolution of the hologram data from a first resolution into a second resolution based on the envelop having the determined direction and height.

Abstract: Provided are a hologram image representation method and a hologram image representation device. A hologram image representation method comprising: receiving a three-dimensional input image including depth information; obtaining a plurality of input image layers from the three-dimensional input image based on the depth information; generating a plurality of Computer Generated Hologram (CGH) image layers by performing CGH processing on each of the plurality of input image layers; and representing a hologram image using the plurality of CGH image layers.

Abstract: In the present invention, by providing an apparatus for displaying a hologram including: a beam source configured to output a plurality of beams, a spatial light modulator configured to include a plurality of SLM (spatial light modulator) regions, display a hologram, and diffract the plurality of beams; a plurality of front lenses each corresponding to the plurality of SLM regions, and configured to refract the plurality of beams diffracted from each of the plurality of SLM regions; a plurality of filters each corresponding to the plurality of SLM regions, and configured to filter a part of the plurality of refracted beams; and a plurality of back lenses each corresponding to the plurality of SLM regions, and configured to display an interference image corresponding to the hologram using the filtered part beam, the beam path of the hologram displaying apparatus can be drastically reduced, and an entire size of the hologram displaying apparatus can be reduced, so that it is possible to down-size the digital ho

Abstract: In the present invention, by providing an apparatus for displaying a complex modulated holograph and including a light source configured to output light, a display configured to display the hologram by diffracting the output light through a plurality of pixels, and a processor configured to control the display to obtain complex hologram data corresponding to the hologram, and modulate the output light based on the complex hologram data and device information of the plurality of pixels, it is possible to modulate amplitude information and phase information of the light source into required values and display a complex hologram, and to remove a noise component of the hologram.

Abstract: Provided is an apparatus for measuring a quality of a holographic image. The apparatus includes: a hologram image reconstruction unit configured to perform a hologram image; a superimposed focus image generation unit configured to collect an area that is in focus from reconstructed images and superimpose into a single image; and a hologram image quality measurement unit configured to perform an image quality evaluation for the superimposed focus image.

Abstract: Provided is a method for converting a hologram resolution of an apparatus for converting a hologram resolution. The apparatus for converting a hologram resolution includes receiving a hologram data and determining a direction and a height of an envelope for the hologram data based on first information associated with the hologram data. The apparatus for converting a hologram resolution includes converting the resolution of the hologram data from a first resolution into a second resolution based on the envelop having the determined direction and height.

Abstract: Provided/Disclosed is a holographic display device including a light source configured to output a coherent emission beam, a beam illuminator configured to convert the emission beam to an illumination light having a plane wavefront and a spatially regular intensity and output the converted emission beam, and a spatial light modulator (SLM) configured to display a holographic image by modulating the illumination light based on image information, wherein the beam illuminator is configured to converge and output the illumination light.