Abstract: A method for extracting depth information, which may include extracting depth information relating to an object by using an actual nonlinear waveform instead of a mathematically ideal waveform and simultaneously may include effectively removing errors due to random noises that may be caused in a light source, an light modulator, an imaging device, or the like, is provided. The method may include performing simple multiplex and addition on captured images and performing a search of a look-up table. Thus, correct distance information may be extracted without being affected by a type of waveform being used, and an amount of memory which is used and calculated for removing random noise may be reduced.

Abstract: Provided are a depth camera and methods of measuring a depth image by using the depth camera. The depth camera is a time-of-flight (TOF) depth camera including: an illumination device that illuminates a patterned light to an object; a filter unit that reduces noise light included in light reflected by the object; and an image sensor that provides a depth image of the object by receiving light that enters through the filter unit. The illumination device includes: a light source; and a patterned light generator that changes the light emitted from the light source into the patterned light. The filter unit includes a band pass filter and an optical modulator. The patterned light generator may be a diffractive optical element or a refractive optical element.

Abstract: Provided are a wavelength separation device and a 3-dimensional (3D) image acquisition apparatus including the same. The wavelength separation device includes a first prism having an inclined surface and a second prism bonded to a first region of the inclined surface of the first prism. A wavelength separation coating may be disposed at a junction between the first portion of the inclined surface of the first prism and the second prism, and a second portion of the inclined surface of the first prism, different from the first portion, is a total reflection surface that totally internally reflects light.

Abstract: Provided is a 3-dimensional (3D) image acquisition apparatus and a method of driving the same. The 3D image acquisition apparatus includes a light source, an optical shutter, an image sensor, an image signal processor, and a controller. The light source is configured to project illumination light on an object. The optical shutter is configured to modulate the illumination light reflected from the object with a predetermined gain waveform. The image sensor is configured to generate a depth image by detecting the illumination light modulated by the optical shutter. The image signal processor is configured to calculate a distance from the 3D image acquisition apparatus to the object using the depth image generated by the image sensor. The controller is configured to control an operation of the light source and an operation of the optical shutter.

Abstract: Provided are a three-dimensional (3D) image acquisition apparatus, and a method of generating a depth image in the 3D image acquisition apparatus. The method may include sequentially projecting a light transmission signal, which is generated from a light source, to a subject, modulating reflected light, which is reflected by the subject, using a light modulation signal, calculating a phase delay using a combination of a first plurality of images of two groups, from among a second plurality of images of all groups obtained by capturing the modulated reflected light, and generating a depth image based on the phase delay.

Abstract: A 3-dimensional (3D) image acquisition apparatus capable of simultaneously obtaining a color image and a depth image in a single shooting operation is provided. The apparatus includes a light source for radiating illumination light having a predetermined wavelength onto an object; a lens unit having at least four object lenses; an image sensor including at least four sensing regions for individually receiving light focused by the object lenses and for generating images; and at least three optical shutters individually facing at least three of the at least four object lenses and for modulating incident light with predetermined gain waveforms.

Abstract: A large-area transmissive type optical image modulator, a method of manufacturing the same, and an optical apparatus including the transmissive type optical image modulator are provided. The large-area transmissive type optical image modulator includes: a base substrate; a first expitaxial layer formed on the base substrate; a second expitaxial layer formed on the first expitaxial layer; a first electrode formed on the first expitaxial layer and spaced apart from the second expitaxial layer; a second electrode formed on the second expitaxial layer; and a transparent substrate covering the second expitaxial layer and the second electrode, wherein the base substrate includes a through hole corresponding to a light emitting area, and the first expitaxial layer may include an n-type or p-type doping material.

Abstract: A 3-dimensional (3D) image acquisition apparatus and a method of calculating depth information in the 3D image acquisition apparatus, the 3D image acquisition apparatus including: an optical modulator for modulating light reflected from a subject by sequentially projected N (N is 3 or a larger natural number) light beams; an image sensor for generating N sub-images by capturing the light modulated by the optical modulator; and a signal processor for calculating depth information regarding a distance to the subject by using the N sub-images.

Abstract: A photomask that is capable of implementing off-axis illumination (OAI), and a method of fabricating the same, are provided. The photomask includes a transparent substrate, a plurality of opaque patterns formed on the front surface of the transparent substrate, for defining a floodlighting portion for forming patterns, and a plurality of phase gratings formed on the back surface of the transparent substrate, allowing off-axis illumination (OAI) of an incident light source beyond the OAI limit of exposure equipment, allowing use in the outmost region of an aperture, and allowing modified illumination having a shape suitable for the layout of the opaque patterns.

Abstract: Disclosed is a thermal treatment apparatus radiating low and high temperature, which includes a low-temperature radiating section and a high-temperature radiating section, and can rotatably scan affected parts. Both the low and the high temperature radiating sections are rotatable. The thermal treatment apparatus according to the present invention further includes a controller, with which a user can adjust the period of time for radiating low and high temperature as well as for rotation of the low-temperature radiating section and the high-temperature radiating section. The low-temperature radiating section is connected to a cryo-pump, while the high-temperature radiating section comprises an infrared ray lamp or a far infrared ray lamp. The present invention is applicable to medical treatment, physical therapy, sterilization of cosmetics or pharmaceuticals, or to tests of critical temperature for survival of cells.

Abstract: A photomask that is capable of implementing off-axis illumination (OAI), and a method of fabricating the same, are provided. The photomask includes a transparent substrate, a plurality of opaque patterns formed on the front surface of the transparent substrate, for defining a floodlighting portion for forming patterns, and a plurality of phase gratings formed on the back surface of the transparent substrate, allowing off-axis illumination (OAI) of an incident light source beyond the OAI limit of exposure equipment, allowing use in the outmost region of an aperture, and allowing modified illumination having a shape suitable for the layout of the opaque patterns.

Abstract: A safety trampoline is described herein. The trampoline comprises a generally circular inner canvas, a plurality of inner plane springs distributed about the perimeter of the inner canvas. The trampoline also comprises a generally circular outer canvas having a hole in its center substantially the same diameter as the perimeter of the inner canvas. The trampoline further comprises a plurality of outer plane springs distributed about the perimeter of the outer canvas and a plurality of binding ropes for attaching the plurality of inner plane springs to the inner canvas and the outer canvas, and for attaching the plurality of outer plane springs to the outer canvas.

Abstract: Phase shift masks include axially spaced apart first and second radiation blocking layer patterns and a phase shifting layer pattern between the first and second radiation blocking layer patterns, on a phase shift mask substrate. The first and second axially spaced part radiation blocking layers can define narrow areas of the phase shifting layers so that patterns having fine linewidths and improved resolution can be formed on integrated circuits. Phase shifting masks can be fabricated by forming a first radiation blocking layer pattern on a phase shift mask, blanket forming a phase shifting layer and a second radiation blocking layer, patterning the second radiation blocking layer and patterning the phase shifting layer.