Abstract: A method for measuring video quality includes: receiving subjective video quality measuring data from a plurality of video quality measurers; photographing or capturing a test-target video image and receiving image data; calculating video quality measurement factor values with respect to the received image data, item by item; reflecting the video quality measurement factor values to the subjective video quality measuring data through video quality modeling; mapping results of the reflecting into scores; weighting the video quality measurement factor values according to their correlations with the subjective video quality measuring data; and outputting objective video quality measuring data on a screen. An associated video quality measuring system includes: a subjective video quality measurement input; an objective video quality measuring; a video quality modeling; and a video quality measuring algorithm unit.

Abstract: The present invention relates to an apparatus and method for extracting representative still images from Moving Picture Experts Group (MPEG) video. The apparatus includes a video curve generation unit for calculating the distances between the adjacent frames of all intra frames of input video and generating a video curve that is a cumulative curve of the distances; a video curve division unit for dividing the video curve into a certain number of segments; a still image selection unit for selecting video images corresponding to certain points of the divided video curve as representative still images; and a video output unit for outputting the still images selected by the still image generation unit. Accordingly, the present invention can summarize the video and provide representative still images to a user at high speed.

Abstract: A high-resolution autostereoscopic display is provided.

Abstract: A glassless stereoscopic display, which does not produce color separation and black stripes, includes: a display panel displaying an image using a plurality of pixels; a 3D optical plate separating the image displayed by the display panel into a left-eye image and a right-eye image; and a prism sheet disposed between the display panel and the 3D optical plate and having a plurality of prism elements regularly arranged to rotate an image provided by each of the pixels of the display panel by approximately 90°.

Abstract: A screen and a projection system for producing a projection-type 3D image. The screen separates an image projected from a projector into fields for realizing a 3D image, and includes a birefringence device changing a refractive index according to a polarization direction of an incident beam and a lenticular lens array producing a 3D image using the beam that passed through the birefringence device.

Abstract: A direct viewing type stereoscopic image display apparatus which can remove a moiré pattern is provided. The direct viewing type stereoscopic image display apparatus includes: a first memory which has a first field image signal divided from an image signal of one frame; a second memory which has a second field image signal divided from the image signal of one frame; a display device which forms a first field image and a second field image according to the first field image signal and the second field image signal; an image shift unit which sequentially shifts the first field image and the second field image; and a viewing zone dividing unit which divides the viewing zones of the first field image and the second field image. Thereby, the second field image is shifted from the first field image by a predetermined distance and thus a moiré pattern is removed and image quality is improved.

Abstract: An apparatus and a method of arbitrarily adjusting the output time of caption information included in a received multimedia transport stream for broadcasting, by user input. The method includes: receiving an input of a time value for adjusting the output time of caption information, from a user through a user interface; by demultiplexing the multimedia transport stream, dividing the transport stream into video, audio, and data packets, decoding each packet, and storing the decoded packets in buffers corresponding to a type of each packet; resetting the output time of the caption information by adding the input time value to or subtracting the input time value from the output time included in the video or audio packet; and according to the output time of the reset caption information, blending the data stored in the buffer with the video information and presenting the blended information on the screen.

Abstract: A projection-type 3-D image display device includes a single display element, a polarization conversion switch, a first image shifter, a second image shifter, a projection lens unit, a mirrored light tunnel, and a screen unit. The screen unit includes an image separation unit. The single display element emits light polarized in a first polarization direction according to an input image. The polarization conversion switch time-sequentially converts the first polarization direction of the light emitted by the display element into a second polarization direction. The first image shifter transmits the light having the first polarization direction to form a first image and refracts the light having the second polarization direction to form a second image. The second image shifter faces the first image shifter and is arranged apart from the first image shifter by a predetermined interval. The projection lens unit enlarges and projects the first and second images.

Abstract: A projection-type 3-D image display includes a light source, a single display element, an image shift member, a projection lens unit, and a screen unit. The display element produces an image using light emitted from the light source. The image shift member time-sequentially shifts the image. The projection lens unit enlarges and projects the time sequentially shifted image. The screen unit includes an image separation unit. The image separation unit separates the time sequentially shifted image into images for a left eye and images for a right eye. The projection-type 3-D image display can realize a 3-D image using a single projector by having the image shift member to sequentially shift the images produced by the display element.

Abstract: An aspheric surface measuring apparatus includes an interferometer which generates incident light; a test piece having an aspheric surface from which the incident light is reflected as test light; a first optical element disposed on an optical path of the incident light, having at least one surface with a hologram for diffracting the incident light toward the test piece; and a second optical element disposed after the first optical element, which transmits the incident light toward the aspheric surface and has a concave surface to reduce an incident angle of the test light entering the hologram after having been reflected from the aspheric surface. Alternatively, a single optical element with a hologram and a concave surface can be used instead of the separate first and second optical elements. An extremely aspheric lens can be precisely measured using the apparatus.

Abstract: An image display device to display both a 2-D image and a 3-D image. The image display device includes a display element, an image separation unit, a polarization conversion switch, and a birefringence element. The display element emits light according to image information for a left eye and image information for a right eye. The image separation unit separates the emitted light into an image for the left eye and an image for the right eye. The polarization conversion switch sequentially switches the polarization direction of the incident light. The birefringence element transmits or refracts the light, depending on the polarization direction of the light that has passed through the polarization conversion switch. An image, whose polarization direction has been switched by the polarization conversion switch, is shifted when passing through the birefringence element, whereby the left eye image and the right eye image resolution is improved.

Abstract: A highly efficient lighting system, a scrolling unit, and a projection system adopting the highly efficient lighting system and the scrolling unit are provided. The scrolling unit has at least one lens cell. From the viewpoint of light incident upon the at least one lens cell, the rotation of the at least one lens cell is converted into a rectilinear motion of a lens array, such that incident light is scrolled. The projection system includes a light source, an optical splitter, at least one scrolling unit, and a light valve. The optical splitter splits light emitted from the light source according to wavelenght. The at least one scrolling unit has at least one lens cell. The lens cell has an incident side and an emitting side and divides incident light into light beams. The rotation of the lens cell causes a rectilinear motion of the light beams, thereby scrolling incident light.

Abstract: Provided are an apparatus and a method of transforming a format of a multidimensional image so that the multidimensional image can be output by any type of display device. The apparatus includes a scaler and a formatter. The scaler receives the multidimensional image and scales up or down a resolution of the multi-dimensional image. The formatter receives property information about a display device and transforms the format of the multi-dimensional image to conform to properties of the display device. Accordingly, a three-dimensional image or a stereo image can be easily displayed by any type of display device.

Abstract: A high-resolution display displaying an image on a screen includes an illumination optical system, an image optical system, a pixel moving optical system, and a projection optical system. The illumination optical system includes a light source emitting a light. The image optical system includes an image forming device modulating an incident light to form the image. The pixel moving optical system includes a prism array deflecting the light from the image optical system to move pixels of the image to increase a number of pixels. The projection optical system includes a projection lens projecting the deflected light by the pixel moving optical system onto the screen.

Abstract: A method of aligning an optical system and an optical system incorporating the method. A hologram element is installed in the optical system so that test beams diffracted by the hologram element travel along a same optical path as test beams incident on the optical system. Alignment errors in the optical system are measured using interference patterns formed on an image surface by test beams returned from the optical system and reference beams. At least one optical element of the system is aligned using measurements calculated from the interference patterns. The optical system may provide for temporarily installing the hologram element to perform the measurements or the optical system may be constructed with a hologram formed on any optical element which may require alignment. A direction and a magnitude of any misalignment are determinable based on an appearance of the pattern and a number of circles in the pattern, respectively.

Abstract: A method of aligning an optical system and an optical system incorporating the method. A hologram element is installed in the optical system so that test beams diffracted by the hologram element travel along a same optical path as test beams incident on the optical system. Alignment errors in the optical system are measured using interference patterns formed on an image surface by test beams returned from the optical system and reference beams. At least one optical element of the system is aligned using measurements calculated from the interference patterns. The optical system may provide for temporarily installing the hologram element to perform the measurements or the optical system may be constructed with a hologram formed on any optical element which may require alignment. A direction and a magnitude of any misalignment are determinable based on an appearance of the pattern and a number of circles in the pattern, respectively.

Abstract: A motion vector estimating method that includes calculating correlation values corresponding to a plurality of correlation calculating patterns selected in accordance with types of a present image, and determining a correlation calculating pattern according to the calculated correlation values; and selecting a sub-sampling pattern corresponding to the determined correlation calculating pattern, sub-sampling a present image block and a search area, and then estimating a motion vector, whereby it is possible to reduce an amount of calculation in estimating a motion vector.

Abstract: An image storing and/or replaying apparatus and a method therefor capable of storing a transient image and replaying the stored image at a desired time, the apparatus receives a broadcast stream including a plurality of still image frames and replays the images on a screen. The apparatus includes an image unit, which extracts and stores at least a portion of the plurality of the still image frames and replays the stored still image frames; and a control unit, which controls the extracting, storing, and replaying operations. The apparatus can be adapted to digital and analog broadcasts. In addition, in case of the digital broadcast, an I-frame may be extracted from a compressed image frame and stored. In particular, only some portion of the I-frame, that is, a lower slice of the I-frame, may be stored.

Abstract: A spiral lens disk and a projection system adopting the same are provided. The spiral lens disk has spirally arranged cylinder lens cells and scrolls incident light by converting the rotation of the cylinder lens cells into rectilinear motion of a cylinder lens array. The projection system includes at least one spiral lens disk such that color scrolling is achieved using a single component to form a color image. Due to a reduction in the number of components, a light, low-price projection system can be obtained, and a single-panel projection system with high light efficiency can also be obtained.

Abstract: A projection system includes first and second light sources, separated by a predetermined distance from each other and radiating a single white light in parallel and in the same direction, first and second spiral lens discs including cylindrical lens cells separating the single white light incident from the first and second light sources into a multi white light by converting a rotational motion of the cylindrical lens cells into a rectilinear movement, and first and second spectroscopes separating the multi white light incident from the first and second spiral lens discs into color light beams having different wavelength bands. First and second light valves modulate the color light beams incident from the first and second spectroscopes according to an image signal to form an image. First and second projection lenses project the color light beams modulated by the first and second light valves onto a screen to display the image.