Matches 151 - 200 out of 222 < 1 2 3 4 5 >
Match Document Document Title
6198845 Method for determining document background for adjusting the dynamic range of an image of the document  
The background grey-level of a document is determined based on the gain of the document. A histogram is generated and compressed. The standard deviation of the distribution curve of the compressed...
6147771 Method of image density adjustment and apparatus using the method  
An image density adjusting apparatus in which density of an image signal is adjusted, which performs: a first converting operation for converting an image signal having n-bit into a signal having...
6057946 Tonality correction system  
An image processing apparatus and method which inputs multivalued image data capable of m-level representation, performs image processing on the input data, and converts the processed data into...
6002493 Method for reproducing an image  
The present invention relates to a method for reproducing images from precessionary art. The method comprises the steps of converting a piece of precessionary art to a multi-bit pixel depth bitmap,...
5990922 Image signal processor for a printer  
An image signal processor of a printer is provided. The image signal processor of the printer includes a first memory, a second memory, a multiplexer for selectively and alternately outputting...
5930404 Image processing system and method  
An image processing system and method for laser-printing a composite image containing a monotone image and a multi gradation-level image in a superposed fashion such that the contours of characters...
5862257 Image processing apparatus and image forming apparatus  
Multi-value character (line image) data, characteristic information and half-tone data are stored while the memory is effectively used. Half-tone data is outputted from the attribute separating...
5801845 Image data processor for representing gray levels by a plurality of pixels  
Disclosed is an image data processor for processing input image data representing the gray level of each of pixels constituting an image to produce output image data representing the gray level of...
5777759 Image processing method and apparatus  
An image processing apparatus includes an input unit for inputting image information, and a conversion unit for comparing the input image information with a plurality of threshold values and...
5768482 Resolution-triggered sharpening for scaling of a digital-matrix image  
Method and apparatus prepare an image for printing--and in some cases include an output stage, performing the actual printing--when the overall number of pixels is being scaled up or down from an...
5729663 Method and apparatus for gray screening  
The present invention is a method and apparatus for generating N-bit per pixel output signals in response to M-bit per pixel image input signals, where M is greater than N. The invention employs a...
5721622 Grayscale printing with spatial light modulator and sliding window memory  
A method for printing grayscale images that compensates for problems in the printing process. The presence of a defective element on a spatial light modulator (12) is compensated for using a...
5719682 Method of improved printing using a spatial light modulator  
A method for printing grayscale images that compensates for problems in the printing process. The presence of a defective element on a spatial light modulator (12) is compensated for with use of a...
5699168 Grayscale printing with sliding window memory  
A method for printing grayscale images. A sliding window memory stores an array of exposure data. The memory is initialized (80) with zero values. The memory is then addressed (82) so that the last...
5694224 Method and apparatus for tone adjustment correction on rendering gray level image data  
A method and apparatus for reproducing an original image includes a scanner or other image source for generating a digitized raw image data for each pixel area of an image. For each pixel the raw...
5661570 Image-data processing apparatus  
An apparatus for processing multilevel image data representing a half-tone image, into bilevel image data representing a bilevel image corresponding to the half-tone image, the multilevel image...
5633728 Image processing method  
A method of recording (preserving) and reproducing an image is disclosed. The x and y axes are assumed on the plane of an original image, the z axis (density axis) is assumed to be perpendicular to...
5631746 High resolution simulation printing by printing adjoining pels  
Printer (1) having the capability of printing at 600×2400 dpi resolution simulates 1200×1200 dpi resolution by logically examining two lines of a 1200×1200 bit map and printing identically when...
5606648 Apparatus and method for modulating image signals in a high addressability printing machine  
A printing system is provided for printing an image on a substrate. The image is represented by a set of words with each word including M bits and being modulated so as to produce a single bit...
5553200 Method and apparatus for providing bit-rate reduction and reconstruction of image data using dither arrays  
An apparatus and method for providing bit-rate reduction and reconstruction of image data. Bit-rate reduction of 32-bit CMYK combinations into 16-bit code words is performed on a pixel by pixel...
5469275 Method and apparatus for grayscale adjustment  
A method for adjusting a grayscale spline, defined by a set of interconnected points, for an output device including the steps of adjusting a location of a first point previously located on the...
5455681 Low resolution grey level printing method from high resolution binary input file  
An electronic printing apparatus and method transforms a high resolution binary data file to a lower resolution grey level file for printing by a lower resolution printer. Recording is made upon an...
5452107 Image processing apparatus providing a bilevel image signal by changing binarization threshold value based on densities of original image areas incuding target pixel and less than all surrounding pixels  
An image processing apparatus includes a matrix register part for reading an original image for each area containing a predetermined number of pixels of the original image, and for extracting...
5426514 Method of gray scaling facsimile images  
A system and method for creating data values suitable for producing a gray scaled approximation of a facsimile image on a lower resolution display. Facsimile image data is compressed based upon...
5377015 Image processing device for converting a scanned image into a monochrome image  
An image processing device for converting a scanned image into a monochrome image includes a scanner for providing an image signal which is applied to a sampling and holding circuit. The output of...
5359431 Classification to change exposure within a cell of different pixels  
A method and arrangement for reproducing an original image, scans an original image to produce a digitized image, this digitized image containing a plurality of pixels. The pixels are grouped into...
5359433 Image processing apparatus with reduced image deterioration in highlight portions  
An image processing apparatus binarizes input multi-level pixel data by changing the same either to the minimum density data corresponding to white or to a minimum reproducible density data...
5337162 Image processing apparatus for preventing occurrence of moire in output image  
An image processing apparatus in which a multilevel image signal generated from an original image by a scanner is input and processed so as to produce multilevel image data describing a gray level...
5321525 Clustered halftoning with dot-to-dot error diffusion  
A method of quantizing pixel values in an image formed by a plurality of pixels, each pixel representing an optical density of the image at a location within the image, and having an original...
5313310 Tonal conversion method for pictures  
Disclosed herein is a tonal conversion method of a picture useful upon producing a reproduced picture such as hard or soft reproduced picture from an original picture recorded or otherwise stored...
5301039 Image processing apparatus with pixel tone discrimination  
An image processing apparatus has elements for inputting pixel data and for processing the input pixel data. The processing element includes a device for quantizing the input pixel data to produce...
5278667 Multiple valve image input device  
A multiple value image input device receives image data expressed in multiple chromatic gradation levels from an outside source and converts the data into digital form. The multiple value image...
5260806 Process for controlling tone reproduction  
The principal task in graphic arts reproduction is to convert input images, such as continuous tone original images, into output images, such as half-tone images, to permit, for instance, the...
5221971 Area modulation printing apparatus  
Printing apparatus and method particularly suited to provide a hardcopy of an image which is produced by medical imaging equipment or the like. The apparatus produces hardcopy consisting of pixels...
5193011 Method and apparatus for producing variable width pulses to produce an image having gray levels  
A system for printing gray levels without needing to use halftone cells. An architecture is disclosed for controlling printing elements to deposit a variable amount of toner onto a given area of...
5072305 Picture producing apparatus using picture information values correlated to light intensities in tonal conversion formula  
A picture producing apparatus which produces a reproduced picture having a middle tone on a recording sheet based on signals, by obtaining density information values of respective pixels on an...
4962433 Video printer having converting means for converting a video signal into digital picture data  
A video printer utilizing a plurality of converting tables corresponding to a plurality of gradation characteristics, each for converting picture data into recording data on the basis of its...
4951159 Digital modulation technique  
A digital pulse with modulator is described for use with a Raster-scanning print engine in which a grey scale having a high number of levels, typically at least 63, is described. This modulator...
4912562 Method of and means for printing a multilevel representation of an image  
A half-tone reproduction of an object on a recording medium is produced using gray level values contained in the cells of an object matrix representative of the object. An actuatable marking device...
4837846 Method of the image processing  
A method of image processing for sampling the concentration of each portion of an image in the unit of a picture element and for binarizing the concentrations of picture elements in the unit of a...
4821111 Method of recording facsimile signals  
A method of recording the varying gray shades of a facsimile signal line by line with a thermal print head having a linear arrary of heating elements sorts out the individual pixels of a facsimile...
4809082 Method of and apparatus for generating image data used to record an image having gradation  
Gradation levels of an image to be recorded are expressed by gradation data having integral parts and decimal parts. Random numbers are composed with the decimal parts to provide composite values....
4788598 Coding method and apparatus  
A coding method includes the steps of dividing an image into a plurality of blocks each consisting of a plurality of picture elements, dividing gray scale information of each intrablock picture...
4777536 Thermal printing device  
A printing device in which pulses corresponding in number to gradations to be visibly expressed are applied to the heat generating elements of a thermal had in such a manner that the heat...
4731662 Image processing method for processing an image signal differently depending on the range of an image characteristic thereof relative to the range within which an output device can reproduce the image characteristic  
The present disclosure relates to a method of processing an image signal in which one image characteristic, such as luminance density or color saturation, may have a range incapable of reproduction...
4730221 Screening techniques by identification of constant grey components  
Identification of constant grey components in electronic screening by first determining from the continuous-tone input, the maximum value of grey, the minimum value of grey and the average value....
4689694 Image recording apparatus utilizing linearly arranged recording elements  
There is disclosed a recording apparatus with plural light-emitting elements. The elements are divided into plural groups, and in each group plural light-emitting elements receive image signals...
4636845 Digital image processing method for over and under exposed photographic images  
In a method of digital image processing employing a tone reproduction function generated by normalizing the histogram of a sample of tone values selected from the image, it is an object to...
4611247 Radiation image reproducing apparatus  
A radiation image reproducing apparatus reads a radiation image out of a first recording medium and reproduces it on a second recording medium as a visible image. Input devices of the apparatus...
4578715 Picture signal quantizing circuit  
A picture signal quantizing circuit for quantizing with respect to multiple levels an analog picture signal read from a document by converting it into a digital picture signal which has a plurality...
Matches 151 - 200 out of 222 < 1 2 3 4 5 >