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US 4,841,375 AGranted
Image-resolution conversion apparatus for converting a pixel-density of image data
AssigneeKabushiki Kaisha Toshiba
InventorsShunichi Nakajima, Koji Izawa
Life of this patent
Estimating the term…
Abstract
Image data having a predetermined pixel density, and output from a personal computer, is supplied to an image-resolution conversion apparatus connected to a printer having a pixel density different from the above predetermined pixel density. In the image resolution conversion apparatus, the pixel density of the input image data is converted, by a pixel converter, to a pixel density matching that of the printer, according to a conversion ratio set by a pixel-density conversion ratio setter for setting a ratio of pixel-density conversion, from the pixel density of the personal computer to that of the printer. The pixel-density converted image data is then supplied to and printed by the printer.
Claims24
An image-resolution conversion apparatus for converting a pixel-density of an image data, comprising:
- input means for receiving image data which can be of various pixel densities;
- selection means, having a plurality of pixel-density conversion ratio data items, respectively representing ratios of pixel-density conversion for converting the pixel-density of the image data to an other predetermined pixel density stored therein for selecting one of the plurality of stored pixel-density conversion ratio data responsive to the pixel density of the image data received by said input means;
- and
- pixel-density converting means, receiving the image data received by said input means and the pixel density conversion ratio data corresponding to a ratio between a present pixel density and an input pixel density from said selection means, for performing a predetermined arithmetic operation on the basis of the pixel-density conversion ratio data from said selection means, to convert the pixel density of the image data to said present pixel density.
1 more element
An image-resolution conversion apparatus for converting a pixel-density of an image data, comprising:
- input means for receiving image data having different pixel densities along main scanning and subscanning directions;
- selection means, having a plurality of pixel-density conversion ratio data items representing ratios of pixel-density conversion for converting the pixel densities of the image data to predetermined identical pixel density along the main scanning and subscanning directions, for selecting the pixel-density conversion ratio data on the basis of the pixel-densities of the image data received by said input means, the predetermined identical pixel density being different from that of the image data;
- and
- pixel-density converting means, receiving the image data received by said input means and the pixel-density conversion ratio data output from said selection means, for performing a predetermined arithmetic operation on the basis of the pixel-density conversion ratio data from said selection means to convert the main scanning and subscanning pixel densities of the image data to the predetermined pixel density.
1 more element
A printer apparatus comprising:
- printing means;
- input means for receiving image data items of different pixel densities;
- selection means, having a plurality of pixel-density conversion ratio data items representing ratios of pixel-density conversion for converting a pixel-density of the image data to be a predetermined pixel density matching that of said printing means, for selecting predetermined pixel-density conversion ratio data on the basis of the pixel density of the image data received by said input means;
- and
- pixel-density converting means, receiving the image data received by said input means and the pixel-density conversion ratio data output from said selection means, for performing a predetermined arithmetic operation on the basis of the pixel-density conversion ratio data output from said selection means, and converting the image data received by said input means to image data having the predetermined pixel density.
2 more elements
A printer apparatus comprising:
- printing means;
- input means for receiving image data whose main scanning and subscanning pixel densities are different;
- selection means, having a plurality of pixel-density conversion ratio data items representing ratios of pixel-density conversion for converting the pixel densities of the image data to a predetermined identical pixel density matching that of said printing means for selecting the predetermined pixel-density conversion ratio data on the basis of the pixel density of the image data received by said input means, at least one of the main scanning and subscanning pixel densities being different from the predetermined identical pixel density;
- and
- pixel-density converting means, receiving the image data received by said input means and the pixel-density conversion ratio data output from said selection means, for performing a predetermined arithmetic operation on the basis of the pixel-density conversion ratio data output from said selection means, and converting the image data received by said input means to image data having the predetermined identical pixel density;
- and
- output means, connected to said pixel-density converting means, for outputting to said printing means the image data whose pixel density has been converted.
4 more elements
A method of converting a pixel density of image data, comprising the steps of:
- receiving image data items of different pixel densities;
- selecting and outputting one of a plurality of stored pixel-density conversion ratio data items representing ratios each for pixel-density conversion, for converting a pixel density of the image signal to a predetermined pixel density different from that of the image data;
- and
- performing a predetermined arithmetic operation on the basis of the pixel-density conversion ratio data, and converting the image data into image data having the predetermined pixel density.
1 more element
Dependencies are inferred from the claim text.