Abstract: Disclosed is a method and apparatus for encoding/decoding a video. According to an embodiment, provided is a method of setting a level for each of one or more regions, including decoding a definition syntax element related to level definition and a designation syntax element related to target designation from a bitstream; defining one or more levels based on the definition syntax element; and setting a target level designated by the designation syntax element among the defined levels for a target region designated by the designation syntax element.

Abstract: An optical imaging system includes a first lens group having negative refractive power, a second lens group having positive refractive power, and a third lens group having negative refractive power, wherein the second lens group and the third lens group are configured to move in an optical axis direction to adjust a focal length and magnification, and the following conditional expression is satisfied, FNOt?3.6, where FNOt is an F value at a telephoto end of the optical imaging system.

Abstract: Disclosed herein is a method for decoding a video including determining a coding unit to be decoded by block partitioning, decoding prediction syntaxes for the coding unit, the prediction syntaxes including a skip flag indicating whether the coding unit is encoded in a skip mode, after the decoding of the prediction syntaxes, decoding transform syntaxes including a transformation/quantization skip flag and a coding unit cbf, wherein the transformation/quantization skip flag indicates whether inverse transformation, inverse quantization, and at least part of in-loop filterings are skipped, and the coding unit cbf indicates whether all coefficients in a luma block and two chroma blocks constituting the coding unit are zero, and reconstructing the coding unit based on the prediction syntaxes and the transform syntaxes.

Abstract: An optical imaging system includes: a first lens group including a plurality of lenses; a second lens group including a plurality of lenses; a first reflecting member disposed on an object side of the first lens group; and a plurality of second reflecting members arranged between the second lens group and an image sensor. One or both of the first lens group and the second lens group is movable along an optical axis, an interval along the optical axis between the first lens group and the second lens group is varied between a first interval and a second interval smaller than the first interval, and as at least one of the first lens group and the second lens group is moved, one or more of the second reflecting members are moved.

Abstract: An optical imaging system includes a first lens group including at least one lens; a second lens group including at least one lens; and a third lens group including at least one lens, wherein the first lens group, the second lens group, and the third lens group are sequentially disposed in ascending numerical order along an optical axis from an object side toward an image side, each of the second lens group and the third lens group is configured to move along the optical axis relative to the first lens group, the at least one lens of the second lens group includes at least one glass lens and at least one plastic lens, an Abbe number of a glass lens of the second lens group is vg2_g, an Abbe number of a plastic lens of the second lens group is vg2_p, and |vg2_g?vg2_p| is greater than 25.

Abstract: An imaging lens system includes a first lens having a negative refractive power, a second lens having a refractive power, a third lens having a refractive power, a fourth lens having a refractive power, a fifth lens having a refractive power, and a sixth lens having a convex object-side surface is convex in a paraxial region thereof and a concave image-side surface in a paraxial region thereof. The first to sixth lenses are sequentially disposed in ascending numerical order along an optical axis of the imaging lens system from an object side of the imaging lens system toward an image plane of the imaging lens system, and one or more of the first to fifth lenses is configured to be movable in a direction of the optical axis.

Abstract: A folded lens system includes a lens module including a plurality of lenses, an image sensor having an imaging plane, and a first reflection module disposed between the lens module and the image sensor and configured to change a path of light passing through the lens module a plurality of times. The light passing through the lens module is subjected to three total internal reflections and two reflections by the first reflection module.

Abstract: An optical imaging system includes a first lens group, a second lens group, a third lens group, and a fourth lens group sequentially disposed in ascending numerical order along an optical axis of the optical imaging system from an object side of the optical imaging system toward an imaging plane of the optical imaging system, wherein at least one lens group among the first lens group to the fourth lens group is configured to be movable along the optical axis, the first lens group has a positive refractive power and comprises a reflective member and at least one lens disposed between the object side of the optical imaging system and the reflective member, and the at least one lens is configured to refract light passing through the at least one lens to converge the light to be incident on the reflective member.

Abstract: An optical imaging system includes a first lens group including two or more lenses, and a second lens group including two or more lenses. The first lens group and the second lens group are sequentially arranged from an object side, and the second lens group is configured to be movable in an optical axis direction. 0.8<TTL/f<1.2. Here, TTL is a distance from an object-side surface of the foremost lens of the first lens group to an imaging plane, and f is a focal length of the optical imaging system.

Abstract: An imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, sequentially disposed from an object side. A field of view (FOV) of the imaging lens system according to an embodiment is wider than 85 degrees and narrower than 160 degrees. In the imaging lens system according to an embodiment, a distance (TTL) from an object-side surface of the first lens to an imaging plane is greater than 6.0 mm and less than 9.0 mm.

Abstract: An optical imaging system includes a plurality of fixed lenses disposed along an optical axis; a first reflective member disposed on an object side of the plurality of lenses; and a plurality of reflective members disposed on an image side of the plurality of lenses. At least one of the plurality of lenses is a variable lens having a variable focal length, and each of the plurality of reflective members is configured to move as the focal length of the variable lens changes.

Abstract: An optical imaging system includes: a first lens group including a plurality of lenses; a second lens group including a plurality of lenses; a first reflecting member disposed on an object side of the first lens group; and a plurality of second reflecting members arranged between the second lens group and an image sensor. One or both of the first lens group and the second lens group is movable along an optical axis, an interval along the optical axis between the first lens group and the second lens group is varied between a first interval and a second interval smaller than the first interval, and as at least one of the first lens group and the second lens group is moved, one or more of the second reflecting members are moved.

Abstract: A camera module includes a first lens group; a first optical path folding unit; a second lens group; and a second optical path folding unit. The first lens group, the first optical path folding unit, the second lens group, and the second optical path folding unit are sequentially disposed from an object side of the first lens group toward an imaging plane of the camera module. The first optical path folding unit includes a first fixed reflective member and a first movable reflective member configured to vary a length of an optical path between the first lens group and the second lens group, and the second optical path folding unit includes a second fixed reflective member and a second movable reflective member configured to vary a length of an optical path between the second lens group and an imaging plane.