Tohoku University

Other

Panasonic Corporation

Yamatake Corporation

Vocsis Corporation

Koichi Ito

Takafumi Aoki

Koji Kobayashi

Hiroshi Nakajima

Akio Nishimura

Tomohide Ishigami

Atsushi Katsumata

Eiko Kosuge

Kazuyuki Miyazawa

The present invention provides an image processing method capable of intuitively recognizing the three-dimensional shape of an organ by limiting the inspection range to the vicinity of the diagnostic target organ in image diagnosis. Given binary three-dimensional data representing an object in three-dimensional space, the image processing method partitions the object into individual segments with boundaries on narrow parts of the object's shape. A series of organs with no numerical differences in the boundaries on the image data can be segmented into individual organs at geometrically constricted locations because the connected organs can be identified by their shape. As a result, it is possible to examine a limited area specific to the target organ during image diagnosis, and to perform the examination while viewing the intuitive 3D shape of the organ during image interpretation.

Image processing method, image processing program, and image processing device for partitioning a 3D object at narrow parts of shape

A disparity calculating apparatus which calculates a disparity value from a stereo image including first and second images includes: an image dividing unit which divides the first image into segments; a reference point determining unit which sets reference points to the first image; a corresponding point detecting unit which (i) calculates, for each reference point, a corresponding point which is included in the second image and corresponds to the reference point, based on phase information of images obtained by performing Fourier transform on the first image and the second image, (ii) calculates a disparity value using the reference point and each corresponding point, and (iii) calculates a reliability of the disparity value; and a disparity assigning unit which assigns each of the segments which includes a corresponding one of the reference points the disparity value and the reliability calculated by the corresponding point detecting unit.

Disparity calculating apparatus and disparity calculating method

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.

Iris authentication apparatus

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.

System and method for comparing dental X-ray images

Growing community of inventors

Miyagi, Japan

Koichi Ito