Kabushiki Kaisha Toshiba

Other

Gururaj Rao

Hiroki Kanno

Naofumi Yamamoto

Sunao Tabata

Haruko Kawakami

An image processing apparatus includes an error correcting section for correcting an input image on the basis of a supplied error correction amount and outputting a corrected image, a threshold processing section for processing the corrected image on the basis of a predetermined threshold, further processing the corrected image on the basis of the error correction amount, and outputting an output signal, a correction amount calculating section for calculating in advance a plurality of correction amounts corresponding to possible values of the output signal in parallel with processing of the threshold processing section on the basis of the corrected image output from the error correcting section, and selecting one of the plurality of error correction amounts as the error correction amount in accordance with the value of the output signal actually output from the threshold processing section, and an error correction amount supplying section for supplying the error correction amount calculated and selected by the correction amount calculating section to the error correcting section and the threshold processing section, and diffusing an error of the image to surrounding pixels.

Image processing apparatus for performing high-speed error diffusion

An image processing apparatus incorporating a field separating section for separating an original image into plural types of fields in response to a first image signal obtained at a rough density of the supplied original image, a characteristic value calculating section for calculating a characteristic value of the original image in response to a second image signal of the original image obtained at a density which is higher than the rough density, and a discrimination section for discriminating an image field of the original image in accordance with the characteristic value to correspond to the type of the field.

Image processing apparatus for discriminating image field of original document plural times and method therefor

An image processing apparatus including an identification circuit for identifying the type of acquired image information, a determination circuit for determining resolution and the number of quantization steps according to the result of identification and a quantization circuit for quantizing the image information using an error diffusion process based on the determined resolution and the number of quantization steps.

Method and apparatus for encoding image, image decoding apparatus and image forming apparatus

A plurality of image regions in the image of the original document are determined on the basis of the image data of the original document. The positions of the plurality of image regions are then indicated as regions in the image of the original document by the display. With use of the display, the user specifies at least one point in the image of the original document in order to specify one region. On the basis of the coordinates of the position specified by the user and the relative positions of the image regions, the image region corresponding to the specified position is determined as the specified region. The image in the specified region is then subjected to the image process desired by the user.

Image processing apparatus having image region specifying function

Black pixels of image signals are expanded, a plurality of black pixel regions obtained by expanding the black pixels are connected to each other, and the circumscribing rectangles of the connected regions are extracted. In accordance with characteristics of the positions and sizes of the extracted circumscribing rectangles and the direction of characters in the circumscribing rectangles, whether the direction of the image is longitudinal or lateral and whether the image faces upwards or downwards are determined. In accordance with a result of the determination, configuration of the plural original document images on a sheet is decided. The plural original documents are combined into one composite image with the decided configuration. Therefore, a required copy output can be obtained regardless of the direction of the original document employed by a user and the direction of the original document set by the same.

Image processing apparatus

An image forming apparatus including scanner section for reading an image of documents and an image of a separation sheet, a circuit for recognizing the image of the separation sheet from the image of the documents, a determining circuit for determining a processing for the image of the documents based on the image of the separation sheet, an operation panel for receiving a processing instruction for the image of the documents, and a processing circuit for processing the image of the documents based on the separation sheet and the processing instruction.

Image forming apparatus for processing according to separation sheet

An image input section reads an image on a document, and simultaneously output image data of a plurality of pixels. An input image converting section generates second image data continuing in a sub-scanning direction based on image data. An image processing section provides a predetermined image processing to the image data to generate third image data. An image output section forms a duplicating image of an image on the document by simultaneously using a plurality of laser devices corresponding to each pixel based on the third image data. Image data in which a plurality of pixels is simultaneously input is arrayed and adjusted to be applied to a multi-beam output. As a result, an image processing for obtaining a high quality of the duplicating image can be performed at high speed.

Image forming device

There is provided an image processing apparatus capable of easily removing or suppressing an area which need not be copied in an image. A characteristic amount calculation section detects rectangular areas physically/logically connected to each other from an image read by a scanner, and calculates unnecessary area information required to detect the characteristic amount and unnecessary area of the rectangular areas. An unnecessary area identifying section compares the characteristic amount of each object with unnecessary area identifying reference information based on the unnecessary area information to detect whether the object is an unnecessary area. An output processing section removes or filters the detected unnecessary area according to a specified method to store the unnecessary area in an output image storage section.

An image processing apparatus includes a circuit for correcting a first image data of a target pixel corresponding to a correction amount, a circuit for generating a third image data on the basis of the second image data and a preset threshold value, the third image data having a gradation value less than one of the second image data, a circuit for comparing the second image data with the third image data to output a difference value therebetween, and a circuit for deriving the correction amount. based on the difference value to randomly diffuse the difference value to the peripheral portion of the target pixel and supplying the correction amount to the correcting circuit.

Image processing apparatus for performing random mask process

A binarization circuit binarizes a pixel signal indicative of an input image, using binarizing processing capable of preserving a gradation of a photograph image. A run expansion circuit performs processing for expanding black pixels included in a binary image to obtain runs, and outputting a run expansion signal. A labelling circuit integrates connected runs into an integrated region (a label) by means of a circumscribing-rectangle extraction circuit, and obtains the position and the size of a rectangle which circumscribes each integrated region, thereby outputting the obtained data as circumscribing-rectangle data. A determination circuit determines whether the integrated region is a text region or a photograph (continuous) region from the size and the configuration of the circumscribing rectangle, and outputs a determination signal.

In multi-gradation level processing performed by using an ordered dither scheme, offset information between one dither matrix value and dither matrices is set, and all multi-gradation level threshold values are calculated from the basic dither matrix values and the offset information. Multi-gradation level processing is performed by comparing an input image with the calculated threshold values. With this operation in the multi-gradation level processing performed by the ordered dither scheme, all the dither threshold values required for the multi-gradation level processing are generated from the basic dither matrix information and the offset information.

Image processing apparatus using derived ordered dither matrix

From input document data there are detected the features of the document, such as the top, bottom, left and right margins, the character space, the line space, the word space, the column space, the size and coordinates of each character, and the like. Values by which the spaces thus detected, including the character space and the line space, are to be adjusted, and a ratio at which to reduce or enlarge the characters are calculated from the features of the document and the minimum margins, the minimum character size and the like preset based on the size of the medium used in an output device such as laser printer. The coordinates of each character on the document is changed in accordance with these values and the character-reducing or -enlarging ratio. The size of the input image is changed based on the original and changed coordinates of each character. The data representing the image thus changed is supplied to the output device, which display or prints a document image, with the spaces adjusted and the characters output in an optimum size.

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Yokohama, Japan

Gururaj Rao