Abstract: An information processing apparatus includes a processor configured to: acquire user data posted in a chat room participated by multiple users; and with multiple display forms changed, display association information that associates at least one piece of information of the user data or response information responsive to the user data with a user having posted the user data and posting time of the user data.

Abstract: An information processing device includes a processor configured to control a connection to a communication destination and use of a data storage location in the information processing device itself on a basis of a position of the information processing device.

Abstract: An information processing apparatus includes a processor configured to: acquire user data posted in a chat room participated by multiple users; and with multiple display forms changed, display association information that associates at least one piece of information of the user data or response information responsive to the user data with a user having posted the user data and posting time of the user data.

Abstract: An information processing apparatus includes a processor configured to: correlate user groups each constituted from users that are present at plural locations in a real space with regions in a virtual space in which movement between the regions is allowed; and display, when a user has moved between the regions in the virtual space, images related to users that constitute a user group correlated with a region as a movement destination in display ranges specified for the users, respectively, and display an image related to the user who has moved in a display range for the user who has moved.

Abstract: A three-dimensional space formed by three-channel input signals is divided into a plurality of polyhedrons having vertices at points corresponding to a conversion table. A particular polyhedron is determined which is associated with the points corresponding to the three-channel input signals. The nonlinear interpolation is carried out using the conversion data corresponding to the vertices of the intended polyhedron thus determined and the conversion data corresponding to the vertices of the polyhedrons in surface contact with the intended polyhedron.

Abstract: An image processor includes: a color conversion unit for converting an input signal to color signals of at least four colors; a gamma correction unit for performing gamma correction on the color signals; a binarization unit for binarizing the color signals through comparison with a threshold value; a superimposing unit for superimposing a color signal of at least one color but of the binarized color signals on another color signal to convert the signals to a superimposed color signal; logical operation unit for performing a logical operation previously defined for an image of three or fewer colors on the superimposed color signal; and a separator for separating color signals as an output of the logical operation unit into separated color signals of at least four colors.

Abstract: A continuous-tone image data is converted to a bi-level image data by halftoning conversion, then the bi-level image data i.e. binary image data is compressed by compressing means including predictive coding and image data compressing. These operations are done in a image coding apparatus. In this apparatus, when the continuous-tone image is converted into bi-level image data in halftoning so that predictions of predictive coding become strong. As a result, halftoning conversion is performed within a scope of binary image-coding-rules. This permits to produce a binary data easy to compress. Compressing a binary data in a low distortion quality and at a high compression rate is achievable through a method of image coding, and by an image coding apparatus of the present invention. Also a recording medium including a program carrying out this method is obtainable.

Abstract: An image processor includes: a color conversion unit for converting an input signal to color signals of at least four colors; a gamma correction unit for performing gamma correction on the color signals; a binarization unit for binarizing the color signals through comparison with a threshold value; a superimposing unit for superimposing a color signal of at least one color but of the binarized color signals on another color signal to convert the signals to a superimposed color signal; logical operation unit for performing a logical operation previously defined for an image of three or fewer colors on the superimposed color signal; and a separator for separating color signals as an output of the logical operation unit into separated color signals of at least four colors.

Abstract: A binary image encoding method includes a predicting step of predicting a binary image, and a blocking step of blocking a data sequence, which indicates the prediction hit or miss in the predicting step, into blocks to produce blocked data. Also, a binary image encoding method includes an encoding step of switching a Huffman table in accordance with the blocked data around a Huffman-block-encoding-target block to apply the Huffman block encoding to the encoding-target block.

Abstract: Still color image data is separated into plural planes, and pixels of each plane are processed predictive coding within plane and/or between planes, and the predictive error data is modified by using the correlation of predictive errors within plane and/or between planes, and the modified data is coded by entropy coding so as to curtail the quantity of data, thereby realizing high speed and efficient predictive coding.

Abstract: A method of gradation reproduction including (a) taking image data of a pixel subject to transaction as observing pixel data; (b) weighting the image data with an error diffusion matrix based on an error data calculated on a previously processed neighboring pixel of the observing pixel; (c) obtaining a data of pixel neighboring the observing pixel; (d) calculating a density gradient around the observing pixel from the weighted observing pixel data and the neighboring pixel data, and determining whether or not the pixel lies in an image edge region; (e) determining a dot size by comparing the weighted observing pixel data with a threshold value corresponding to an individual dot size, and selecting a predetermined smaller dot size if the weighted observing pixel data lies in the edge region; (f) producing an output of dot data by taking dot coordinates as a standard position of the observing pixel, if the dot size data is greater than a threshold value for coordinates determination after a comparison between t

Abstract: A three-dimensional space formed by three-channel input signals is divided into a plurality of polyhedrons having vertices at points corresponding to a conversion table. A particular polyhedron is determined which is associated with the points corresponding to the three-channel input signals. The nonlinear interpolation is carried out using the conversion data corresponding to the vertices of the intended polyhedron thus determined and the conversion data corresponding to the vertices of the polyhedrons in surface contact with the intended polyhedron.

Abstract: In a method for color adjustment of a color image, a color adjustment software window is displayed and color image data on an RGB color space before color adjustment is displayed on a before-adjustment image window of a color monitor screen. An operator for color adjustment designates a color on the before-adjustment image window (or a designated color) and sets an adjustment color for the designated color (or a designated adjustment color). The designated adjustment color is set from a color pallet or by changing the R, G and B levels of a designated-color window and color adjustment parameters for the designated color are determined from the designated color and the designated adjustment color.

Abstract: An image with multiple gradations is divided into a plurality of pixel blocks each of which comprises a plurality of pixels. Pixel data of the pixel block are compressed to two representing values indicative of pixel levels and a binary block pattern by block approximation coding. Representing patterns of which the number is less than that of the block patterns are set previously. A plurality of block patterns having a specific relationship with one of the representing patterns are replaced with the one of the representing patterns, so that the block patterns are compressed.

Abstract: An image compression method for encoding gradation image data for use in, for example, a printer or a copying machine handling the gradation image. When a difference between two representative values in one block E)f the image data is less than a predetermined amount, a block code made up of a single piece of gradation data and one pixel array pattern is generated. When the difference is not less than the predetermined amount, the representative values are replaced by any of sixteen substitute values, and a block code is formed to include two gray scale data each of four bits and a single pixel array pattern, thereby realizing coding compression of the image information.

Abstract: A color image processor that corrects a color image signal for the disagreement of images caused by the vibration of the image sensor when scanning a manuscript. The image sensor delivers an image signal that includes three signals, each one representing the level of brightness of one of the primary colors contained on the scanned image. Each signal includes a discrete value for each pixel reading the sensor and hence, comprises the brightness levels for a plurality of pixels. One of the three signals is called a standard color signal; the other two are called non-standard color signals. Each of the brightness levels of a non-standard color signal is sequentially stored in a register array. Individual levels of the pixels in the register array are examined to determine whether a pixel exists at an edge portion of a letter image. A pixel that exists at an edge portion is called a correction objective pixel.

Abstract: In a color separating device, three reflection elements each formed by laminating a dichroic mirror and a total reflection mirror via a transparent layer interposed therebetween are used. The three reflection elements have mutually different spectral characteristics and are arranged to separate incident light reflected from a color original into three color lights without causing a difference in optical paths of the respective color lights. Two of the reflection elements may be used in combination with a condenser lens having principal points whose positions differ depending on wavelengths of light, so as to perform the three-color separation in a similar manner.

Abstract: An image processing apparatus for converting red, green, and blue luminance signals into cyan, magenta, and yellow density signals comprises: a first signal processing circuit for producing the cyan density signal from the red luminance signal; a second signal processing circuit for producing the magenta density signal from the green luminance signal and the cyan density signal; and a third signal processing circuit for producing the yellow density signal from the blue luminance signal, the cyan signal, and the magenta signal. Each of signal processing circuits comprises one or more look-up tables. The table of the second signal processing circuit may include the function of the first signal processing circuit and is supplied with red and green luminance signals. The third signal processing circuit has first and second tables. The first table responds to the cyan density signal and the blue luminance signal. The second table responds to the magenta density signal and the result of the first table.

Abstract: A method of reproducing multiplex images wherein an electrostatic image is formed on an image retainer by using a common electrostatic image forming device, the electrostatic image formed on the image retainer is developed, the steps of the above are repeated to superpose a plurality of toner images on the image retainer, and the toner images is transferred on a recording paper by one step. The developings other than the first time developing are carried out in such a manner that the surface of a developer layer on a developer feeding carrier does not contact with the surface of the toner image on the image retainer.

Abstract: A method of reproducing multiplex images wherein an electrostatic image is formed on an image retainer by using a common electrostatic image forming device, the electrostatic image formed on the image retainer is developed, the steps of the above are repeated to superpose a plurality of toner images on the image retainer, and the toner images is transferred on a recording paper by one step. The developings other than the first time developing are carried out in such a manner that the surface of a developer layer on a developer feeding carrier does not contact with the surface of the toner image on the image retainer.