Hitachi, Ltd.

Hitachi Control Systems, Inc.

Hitachi Medical Corporation

Shinichiro Miyaoka

Makoto Kato

Motohisa Funabashi

Makoto Nohmi

Yuri Takizawa

Ryoichi Sasaki

Toyohisa Morita

Akira Muramatsu

Kuniaki Matsumoto

Takayoshi Shiraishi

Hiroyuki Okawara

Teruji Sekozawa

Hideo Ohata

Toshiro Sasaki

Mikihiko Onari

Michitaka Kosaka

Hirotaka Mizuno

Ken Ishikawa

Ikuo Matsuba

Fumio Wakamori

Shigeyuki Shimauchi

Hidenori Naoe

Tadahiro Teraoka

Junichi Hatakeyama

Nihei Tachi

Shinobu Hayashi

Teruo Takagi

Fumito Shinomiya

Teruzi Sekozawa

A method for extracting a three-dimensional color vector from a three-dimensional color space in which correlated features are distributed includes steps of projecting the three-dimensional color space on a two-dimensional plane, displaying the two-dimensional plane on a display screen of a display, designating a line segment on the display screen by an input device, and executing the above steps at least two times by changing the angle of projection between the three-dimensional space and the two-dimensional plane to extract the color vector.

Method for extracting three-dimensional color vector

A function of simulating change of weather and time in one scene by changing a sky area and an object area in a natural image while maintaining a relationship therebetween. The natural image is separated into a sky area and an object area excluding the sky area. The color of the object area is generated from a reflection model of the object, based on the color of sunlight, the color of a sky light, and a reflectance of the object. The sky light is determined by averaging pixel values of the sky area. The color of the sky light can be determined based on the color of the sunlight and meteorological conditions such as clouds and fog. The color of the sunlight, the meteorological conditions and the color of the sky light can be determined by specifying parameters representing time and weather. By changing the parameters, a simulation for changing the time and the weather can be performed on the entire natural image.

Method for changing a natural image based on a light environment in the

A first image is inputted, and an object area for mapping is determined on the first image. Transformation parameters for the mapping are calculated pixel by pixel from the attributes of the first image in the object area, a second image to be mapped into at least one part of the object area is generated, and the second image is mapped pixel by pixel in the object area of the first image operating the transformation parameters so as to generate a third image. When an image simulation for changing the color and texture in an area of a color or monochromatic gray scale image is performed, an image simulation for ignoring effects of fine texture on the initial image and reflecting the shadow and shade can be realized. When the same texture image is mapped one after another in a plurality of areas on a projection of a perspectively projected three-dimensional space which are originally on the same plane in the original three-dimensional space, by calculating the coordinate values on the projection for setting the parameters for projection transformation from the coordinate values of a smaller number of points, the operator's job of extracting coordinates values can be reduced.

Method and system for image mapping

An information reference method includes a computer, a storage unit for storing display information to be processed by the computer, a display unit for displaying display information stored in the storage unit, and an indication unit for indicating any desired point on the screen of the display unit. The information reference method comprises a step for displaying a portion of display information stored in the storage unit, a step for indicating any desired point of a display image on the screen by the indication unit, and a step for selecting one of a plurality of display information linked in advance to a displayed image. The information retrieval method further comprises a step for providing, within display information, link information for showing the degree of relevancy between a displayed image and the plurality of display information, and a step for mutually comparing link information at an indicated point to decide display information to be selected.

Method of information reference for hypermedia

An image data compression method is disclosed, in which a sheet of image is divided into a plurality of partial images of small area, and in reconstructing an image, the fidelity to the original image is changed in accordance with the utility of the information contained in each partial image, and the image data is compressed in accordance with the particular fidelity.

Image data compression method for applying different compression ratios

An image simulation method and system which is capable of preparing images in a simple way by running image editing tools without programming by a compiler language. The image simulation system includes a computer system for preparing an embedded image in a way that parts of a digital image or the image textures or patterns are embedded in any of several digital background images, with its geometrical shape deformed, or with color data changed as needed, or for preparing an image, color data of which are changed at particular portions thereof. The system further includes circuitry for changing the geometrical shape in preparing the embedded image, for changing the color data, for designating embedding positions, and for storing selection data for the image to be embedded, selection data for the background image, and control data for the images and such processes, and for reproducing the images on the basis of the data set up in advance.

System and method for image simulation permitting editing with common

A texture mapping method projects a specified texture picture onto the surface of an object in another specified picture. Three-dimensional data on the surface shape of the object to be projected is not known previously. The three-dimensional data on the surface shape of the object is estimated on the basis of the data in the objective picture to attain the texture mapping.

Texture mapping method

In order to accomplish a color adjustment capable of determining a color at a high degree of freedom, a variety of color expressions and corresponding input instructions are correlated to reflect the instruction of a color change by a certain expression upon another expression. In order to accomplish a color change considering the changes in the ambience, moreover, each vector of an object color, a light source color, a color texture, an ambient color and an input bias is decided to determine the separated component values of the former three vectors of a picture element value so that the changed color of the picture element value may be determined after the vector change from the separated component values and the changed vectors.

Method for changing color of displayed images by use of color components

The king of a partial image designated on the display screen is determined and desired processing is effected at high speeds. For this purpose, the region designated on the displayed image and the attribute or identity data of that region are stored corresponding to each other. The attribute or identity of the partial image corresponding to the region is retrieved by using the attribute or identity data. The region of the partial image having a predetermined attribute inclusive of the retrieved attribute is picked up, and a predetermined operation is effected on the image data in the region that is picked up.

Image displaying method and apparatus

By using the state transition of a highly interconnected neural network, in order to solve a combination problem, an energy function is set by the following procedure: (i) the energy function is set in correspondence to the size of the combination problem; (ii) the energy function is set for a combination problem to be solved by using an energy function which solved another combination problem of a different size from the combination problem to be solved. Also, in order to solve a problem involving the cutting out a specific image from a whole image, as a combination problem when obtaining pixels representing a contour of an object, the energy function is set by either (i) or (ii) above.

Combination problem solving method and apparatus

An image processing area is divided into a plurality of small areas which are allowed to overlap one another. One or a plurality of pixels in a region to be segmented and in a region not to be segmented are specified. A representative point of the region to be segmented and a reference point of the region not to be segmented are determined from the color information of each of the pixels. A discriminating plane, a plane or a curved surface that intersects the line segment connecting the representative point and the reference point a right angles is used in processing. By the processing a particular region can be segmented out of the image. Further, a shape model is made by two-dimensionally projecting from a given direction the three-dimensional structure expressed by a line drawing consisting of nodes and curves connecting the nodes based on priori property relating the structure of the region to be segmented in the image. The shape model is then roughly correlated in position with the nodes on the contour of the image. An image processing provides stripe images having widths for each of the curves that is recomposed and used to find the contour and structure of the object in detail.

Image segmentation method and apparatus therefor

Method and system of selecting desirable time series data pieces from many time series data pieces. Characteristics extracted from time series data pieces are applied to neurons and neuron state fluctuations are supervised and evaluated through execution of neurocomputing to select desirable time series data.

Method and a system for selection of time series data

In order to highly efficiently compress images of large quantity obtained by the photographing from a plurality of view points, provision is made of means for photographing a three-dimensional body or the like from a plurality of view points, means for forming a correlated image having a high correlation relative to the neighboring images by effecting mean processing for the neighboring images that are photographed, means for constructing, in the form of tree structure data, a set of the photographed images and the images formed by the mean processing, means for estimating the image of a lower rank by the one rank higher image in the tree structure data, and means for encoding an estimated error.

Method and apparatus for image compression

The present invention is capable of registering and reading out a logical element for which the state of the output pin changes. The system includes an input side reading out circuit for reading out the kind of logical element and the states of all the input pins thereof, a decision circuit for deciding the presence of the output pin that the status change is produced on when a logical operation is carried out according to the kind of logical element, an output side reading out circuit for reading out the information related to the logical element of the output pin producing the status change, and an exchange sending circuit for sending each information read out from the output side reading out circuit to the desired registering and reading out circuit for precise high speed logic simulation of a large scale logic circuit containing MOS-type logical elements.

Multiple loop parallel pipelined logic simulation system

Numerical data in a two-dimensional distribution for encoding picture data or voice data at high efficiency is divided into blocks being not equal in length depending on an amount of variation of each numeric data. The numeric data within the divided blocks is converted into data corresponding to an apex of each block, and the converted data is encoded into tree-structure data. Image data is divided into blocks being not equal in length depending on amount of variation of brightness, and the brightness within the divided blocks is converted into data corresponding to an apex of each block, and the converted data is encoded into tree-structure data. Range of values to be taken by data is divided into a range of normal values and a range of abnormal values, and a short bit number is assigned to the quantizing level in the range of normal values and a long bit number is assigned to quantizing level of other data, thereby the variable length coding at two steps is performed.

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Kawasaki, Japan

Shinichiro Miyaoka