Abstract: A band-pass filter has a reflecting optical element having a fixed reflection angle selection region for wavelengths of a given region, and has an optical path such that reflection is performed at least once and transmission is performed at least once at the reflecting optical element.

Abstract: A device includes an agitation tank, a liquid circulation means for circulating a liquid along a tank wall of the agitation tank, and at least one auxiliary heat transfer means provided inside the agitation tank, wherein the auxiliary heat transfer means is constantly put in a wetted state.

Abstract: An optical bidirectional module 10 having therein light emitting element 11 which transmits optical signal to the end facet of the optical fiber, light receiving element 12 which receives optical signal from the end facet of the optical fiber and stair-shaped multi-level grating 15, wherein the stair-shaped multi-level grating separates the first light path between the end facet of optical fiber and the light emitting element and the second light path between the end facet of optical fiber and the light receiving element by a different wavelength of each optical signal, when the module mixes and separates optical signal with different wavelengths traveling in opposite directions related to the end facet of the optical fiber 1, used for bidirectional optical fiber communication by means of a wavelength multiplex system.

Abstract: An image display apparatus has an image display device for displaying an image, an eyepiece optical system, including a holographic magnifying optical element, for magnifying and projecting the image, and a holographic filter, disposed either as part of the image display device or in the optical path between the image display device and the eyepiece optical system, for restricting the wavelength range of the image light.

Abstract: An information display device provided with a prism having at least two reflecting surfaces arranged in facing each other and a hologram surface formed of a reflection-type hologram. And at least one of the two reflecting surfaces is a light-beam-selective surface that selectively transmits or reflects light in accordance with its incident angle. An image light emitted from an image display means enters the prism, and is reflected between the reflecting surfaces, and then is diffractively reflected on the hologram surface, and, after being transmitted through the light-beam-selective surface, is directed to an observer's pupil.

Abstract: An information display device provided with a prism having at least two reflecting surfaces arranged in facing each other and a hologram surface formed of a reflection-type hologram. And at least one of the two reflecting surfaces is a light-beam-selective surface that selectively transmits or reflects light in accordance with its incident angle. An image light emitted from an image display means enters the prism, and is reflected between the reflecting surfaces, and then is diffractively reflected on the hologram surface, and, after being transmitted through the light-beam-selective surface, is directed to an observer's pupil.

Abstract: An image display apparatus is provided for providing a virtual image to an observer. The image display apparatus includes an image display unit, an eyepiece optical system, and a container. The image display unit is for providing modulated light corresponding to the virtual image. The eyepiece optical system is for directing the modulated light from the image display unit to one or both of the observer's eyes. The container is for supporting the image display unit on an edge portion of the eyepiece optical assembly.

Abstract: A display apparatus which has a mirror with a free curved reflective surface of which curvature fluctuates with inflection points, a liquid crystal display (LCD), a back light and a polarizer. Light of an image which was modulated by the LCD is reflected by the free curved reflective surface and passes through the polarizer. Then, the light is directed to an optical pupil. Since the curvature of the free curved reflective surface fluctuates with inflection points, curvature of field and distortion can be corrected properly, and an image of high quality can be formed.

Abstract: A video image data compression archiver is composed of an encoder and an encoder controller. The encoder compresses non-compressed video image data to generate compressed video image data. The encoder controller is connected to said encoder to control a frame size, a frame rate, and an average bit rate of said compressed video image data in response to at least one parameter selected from a group consisting of a number of frames of said non-compressed video image data, a recording time of said non-compressed video image data, and a free area of a recording medium for recording said compressed video image data.

Abstract: A frame receiving unit calculates the number of a frame to be compressed and gets an image data from the frame. A frame checking unit checks the type of the frame and allocates required code memory. When the frame is an I frame, a frequency conversion unit converts the image to a spatial frequency, a quantization unit quantizes the spatial frequency, and a variable-length coding unit performs variable-length coding. At the same time, a reverse quantization unit performs reverse-quantization and a reverse frequency conversion unit performs reverse-conversion to create a reference image. When the frame is a P frame, a motion search unit searches for a motion of the image. The frequency conversion unit converts a difference between the image and the reference image to the spatial frequency, the quantization unit performs quantization, and the variable-length coding unit performs variable-length coding.

Abstract: A device includes an agitation tank, a liquid circulation means for circulating a liquid along a tank wall of the agitation tank, and at least one auxiliary heat transfer means provided inside the agitation tank, wherein the auxiliary heat transfer means is constantly put in a wetted state.

Abstract: According to a first aspect of the present invention, there is provided an apparatus for coding a moving picture while coding a part of frames of the moving picture into intra-frames (I-pictures), a part of frames sandwiched between contiguous intra-frames into forward predictive frames (P-pictures), and frames sandwiched between a forward predictive frame and another forward predictive frame or an intra-frame into a bidirectionally predictive frames (B-pictures), comprising: a determining means for determining the number of B-pictures between a P-picture and another P-picture or an I-picture based on an output frame rate and a substantial frame rate which is defined as the number of pictures capable of being processed per unit time by the apparatus provided that only I-pictures and P-pictures are coded; and a coding means for coding the B-pictures by treating the B-pictures as frames with no differential data.

Abstract: A band-pass filter has a reflecting optical element having a fixed reflection angle selection region for wavelengths of a given region, and has an optical path such that reflection is performed at least once and transmission is performed at least once at the reflecting optical element.

Abstract: An image display apparatus has a display section for displaying an image, an eyepiece optical system, and a transparent plate-shaped member for holding the eyepiece optical system. The image display apparatus is used with the eyepiece optical system placed in front of a viewer's eyes and with the plate-shaped member facing the eyes. The image display apparatus directs light from the display section through the eyepiece optical system to the eyes so that the viewer is presented with a virtual image of the image displayed on the display section and simultaneously permits light from the outside world to be transmitted through the plate-shaped member so as to be directed to the eyes so that the viewer is presented with an image of the outside world. The boundary surface between the eyepiece optical system and the plate-shaped member is so arranged as not to reflect light from the outside world incident thereon at angles of incidence greater than the Brewster angle toward the eyes.

Abstract: An image display apparatus has an image display device for displaying an image, an eyepiece optical system, including a holographic magnifying optical element, for magnifying and projecting the image, and a holographic filter, disposed either as part of the image display device or in the optical path between the image display device and the eyepiece optical system, for restricting the wavelength range of the image light.

Abstract: An application receives an original video and an original audio from a capture or a file to transfer the same to an interface control unit and writes a system code generated by the interface control unit into a system code file. The interface control unit controls a video compression control unit, an audio compression control unit and a system coding control unit of a compression/coding unit to store generated codes in a video buffer, an audio buffer and a system buffer and transfer the codes to the application.

Abstract: An image display apparatus has a display section for displaying an image, an eyepiece optical system, and a transparent plate-shaped member for holding the eyepiece optical system. The image display apparatus is used with the eyepiece optical system placed in front of a viewer's eyes and with the plate-shaped member facing the eyes. The image display apparatus directs light from the display section through the eyepiece optical system to the eyes so that the viewer is presented with a virtual image of the image displayed on the display section and simultaneously permits light from the outside world to be transmitted through the plate-shaped member so as to be directed to the eyes so that the viewer is presented with an image of the outside world. The boundary surface between the eyepiece optical system and the plate-shaped member is so arranged as not to reflect light from the outside world incident thereon at angles of incidence greater than the Brewster angle toward the eyes.

Abstract: Disclosed is a moving picture compression apparatus for performing intra-frame or inter-frame compression every block in frames in a moving picture, which comprises: means for detecting scene change in a moving picture; means for generating code containing information on components in a transformed domain's range gradually extending as the picture advances for a block in a new scene portion of a frame at the scene change detection during plural frames from the frame at the scene change detection, wherein the information is obtained by compressing the block in the new scene portion with the intra-frame compression process in the first frame from the scene change detection, and the information is obtained by compressing the block in the new scene portion with the inter-frame compression process in the second and following frames from the scene change detection.

Abstract: An image display apparatus is provided with a screen having retro-reflectivity, a liquid crystal display device displaying an image, a projection optical system projecting the light of the liquid crystal display device onto the screen, and a beam magnifier located close to the screen and magnifying the light beams, included in the projected light, expressing individual points of the image. The beam magnifier is composed of a diffraction optical element or a diffusing plate, and magnifies each light beam so that the magnification is larger in the direction of the horizontal field of view than in the direction of the vertical field of view. When images having parallax are provided for the left and right eyes, an upper limit of the magnification of the light beams is set in consideration of the distance between the left and right eyes to prevent cross-talk.

Abstract: An image display apparatus is provided for providing a virtual image to an observer. The image display apparatus includes an image display unit, an eyepiece optical system, and a container. The image display unit is for providing modulated light corresponding to the virtual image. The eyepiece optical system is for directing the modulated light from the image display unit to one or both of the observer's eyes. The container is for supporting the image display unit on an edge portion of the eyepiece optical assembly.