摘要:
A system for comparing dental X-ray images includes a positional displacement calculator calculating a positional displacement between dental X-ray test and reference images by using phase-only correlation, a positional displacement corrector correcting the positional displacement, a base point extractor defining, as a base image, any one of the dental X-ray test and reference images, and defining, as a corresponding image, the other one of the two dental images, and extracting base points from the base image, a corresponding point extractor extracting corresponding points, which correspond to the base points, from the corresponding image, a correspondence calculator calculating correspondence between the base points and the corresponding points, a nonlinear distortion corrector correcting a nonlinear distortion between the base image and the corresponding image, based on the correspondence, and a similarity calculator finding, by using phase-only correlation, a similarity between the base image and the corresponding image.
摘要:
A system for comparing dental X-ray images includes a positional displacement calculator calculating a positional displacement between dental X-ray test and reference images by using phase-only correlation, a positional displacement corrector correcting the positional displacement, a base point extractor defining, as a base image, any one of the dental X-ray test and reference images, and defining, as a corresponding image, the other one of the two dental images, and extracting base points from the base image, a corresponding point extractor extracting corresponding points, which correspond to the base points, from the corresponding image, a correspondence calculator calculating correspondence between the base points and the corresponding points, a nonlinear distortion corrector correcting a nonlinear distortion between the base image and the corresponding image, based on the correspondence, and a similarity calculator finding, by using phase-only correlation, a similarity between the base image and the corresponding image.
摘要:
An iris authentication apparatus includes an iris area extraction unit, registration pattern generating unit, collation pattern generating unit, and collation unit. The iris area extraction unit extracts iris areas from a sensed registration eyeball image and a sensed collation eyeball image. When the iris area extraction unit extracts an iris area from the registration eyeball image, the registration pattern generating unit generates a registration iris pattern image by performing polar coordinate transformation of an image in the extracted iris area. When the iris area extraction unit extracts an iris area from the collation eyeball image, the collation pattern generating unit generates a collation iris pattern image by performing polar coordinate transformation of an image in the extracted iris area. The collation unit collates the registration iris pattern image output from the registration pattern generating unit and the collation iris pattern image output from the collation pattern generating unit on the basis of a correlation therebetween.
摘要:
An iris authentication apparatus includes an iris area extraction unit, registration pattern generating unit, collation pattern generating unit, and collation unit. The iris area extraction unit extracts iris areas from a sensed registration eyeball image and a sensed collation eyeball image. When the iris area extraction unit extracts an iris area from the registration eyeball image, the registration pattern generating unit generates a registration iris pattern image by performing polar coordinate transformation of an image in the extracted iris area. When the iris area extraction unit extracts an iris area from the collation eyeball image, the collation pattern generating unit generates a collation iris pattern image by performing polar coordinate transformation of an image in the extracted iris area. The collation unit collates the registration iris pattern image output from the registration pattern generating unit and the collation iris pattern image output from the collation pattern generating unit on the basis of a correlation therebetween.
摘要:
A plurality of images (I, J) of an object (M) when viewed from different viewpoints are taken in. One of the images is set as a standard image (I), and the other image is set as a reference image (J). One-dimensional pixel data strings with a predetermined width (W) are cut out from the standard image (I) and the reference image (J) along epipolar lines (EP1, EP2) calculated from a camera parameter (CPR) and the reference point (p). Calculating a phase-only correlation function from the cut one-dimensional pixel data strings will obtain a correlation peak position (Pa1). A positional shift amount (d) from the correlation peak position (Pa1) is obtained. A search is made for a corresponding point (q) corresponding to the reference point (p) based on this position shift amount (d).
摘要:
A projector includes: an image capturing unit that captures an image of a projection target image (an original image or a corrected image) projected by the projector on a projection surface; a shape model hold unit that holds shape models; a model selection unit that selects a projection surface shape model based on correspondence relationships between first feature points on the projection target image and second feature points on the captured image; a parameter calculation unit that calculates a model parameter which is to be used to approximate a shape of the projection surface shape model to the shape of the projection surface and indicates a positional relationship between the projection surface and the projector, for each projection target image based on the correspondence relationships; a correction unit that corrects another original image; and a projection unit that projects the corrected image as another projection target image.
摘要:
Collation Fourier image data (FIG. 1D) FB generated by performing the two-dimensional discrete Fourier transform (DFT) for the image data (FIG. 1C) of a collation pattern is synthesized with registration Fourier image data (FIG. 1B) generated by performing the two-dimensional DFT for the image data of a registration pattern. After amplitude suppression processing is performed for the resultant data, two-dimensional DFT is performed. A correlation peak is extracted from a correlation component area which appears in the synthesized Fourier image data (FIG. 1E) for which the two-dimensional DFT has been performed. A predetermined area including this correlation peak is then masked (FIG. 1F). The two-dimensional DFT is performed for the masked synthesized Fourier image data, and amplitude restoration processing is performed for the data. The resultant data is re-synthesized with the registration Fourier image data FA, and the two-dimensional IDFT is performed for the synthesized data. With this processing, image data containing a difference pattern like the one shown in FIG. 1G or a moving pattern can be obtained.
摘要:
A sliding nozzle for a molten steel receiving vessel, which comprises: an upper nozzle (22) made of a refractory inserted vertically into a bottom wall of a molten steel receiving vessel; a fixed plate (23) made of a refractory secured horizontally and stationarily to a lower end of the upper nozzle; a horizontally and reciprocally movable sliding plate (24) made of a refractory arranged below the fixed plate; a lower nozzle (25) made of a refractory secured vertically and stationarily below the sliding plate, the lower nozzle comprising a nozzle body (27) and a metallic frame (28) fitted to a flange (27A) at an upper end of the nozzle body, the lower nozzle having a length sufficient to cause a lower end portion thereof to be immersed into molten steel in a mold; a fitting device (30) for pressing the lower nozzle (25) against the lower end of the upper nozzle (22) through the sliding nozzle (24) and the fixed plate (23); and a driving unit (26) for causing the sliding plate ( 24) to slide horizontally and reciprocally between the fixed plate (23) and the lower nozzle (25).
摘要:
A molten steel pouring nozzle having, along the axis thereof, a bore through which molten steel flows. At least part of an inner portion of the molten steel pouring nozzle, which inner portion forms the bore, is formed of a refractory consisting essentially of:______________________________________ zirconia clinker comprising calcium from 40 to 89 wt.%, zirconate where, a content of calcium oxide in the zirconia clinker being within a range of from 6 to 35 weight parts relative to 100 weight parts of the zirconia clinker; graphite from 10 to 35 wt.%, and crystal stabilized calcium silicate from 1 to 30 wt.%. comprising dicalcium silicate (2CaO.SiO.sub.2) and tricalcium silicate (3CaO.SiO.sub.2) ______________________________________
摘要:
A molten steel pouring nozzle having along the axis thereof a bore through which molten steel flows. At least part of an inner portion of the molten steel pouring nozzle, which inner portion forms said bore, is formed with a refractory consisting essentially of:zirconia clinker comprising cubic zirconia andcalcium zirconate: from 40 to 85 wt. %,where, the content of calcium oxide in said zirconia clinker being within the range of from 3 to 35 weight parts relative to 100 weight parts of said zirconia clinker;graphite: from 10 to 30 wt. %;andat least one element selected from the group consisting of:silica: from 1 to 15 wt. %,andmagnesia: from 1 to 15 wt. %.