Abstract: A controller executes a mode in an image forming apparatus in which an image is formed on a sheet by an image forming portion even if a sheet size included in an image forming job is inconsistent with a sheet size stored in the storage portion. In such a mode, the controller executes an operation by which an image having an orientation corresponding to a sheet orientation stored in the storage portion is formed on the sheet if a sheet orientation included in the image forming job is inconsistent with the sheet orientation stored in the storage portion.
Abstract: In an image forming apparatus, a first generation unit controls an image forming unit to form a first measurement image on a first sheet, controls a conveyance unit to convey the first sheet, controls the measurement unit to execute a first scan for measuring the first measurement image based on a measurement condition, adjusts the measurement condition based on a measurement result by the first scan, and controls the measurement unit to execute a second scan for measuring the first measurement image based on the adjusted measurement condition to obtain the first measurement result, and a second generation unit controls the image forming unit to form a second measurement image on a second sheet, controls the conveyance unit to convey the second sheet, and controls the measurement unit to measure the second measurement image to obtain the second measurement result.
Abstract: Provided is an image forming apparatus including: an exposure unit scanning a photosensitive member with a light beam radiated by a light source which is driven by a driving unit; a determination unit determining a number of bit data per pixel for a predetermined pixel of image data; a selection unit having conversion conditions for converting the image data into a bit pattern for the driving, and selecting a predetermined conversion condition depending on the determined number of bit data, the conversion conditions set such that numbers of bit data included in the obtained bit pattern for the radiating are different, and that the numbers of bit data are different depending on the image data; and a generation unit generating, based on the selected predetermined conversion condition and a density value of the predetermined pixel, the bit pattern for generating a PWM signal for the driving for the predetermined pixel.
Abstract: An image processing apparatus includes a first acquisition unit configured to acquire color data representing a color of a target object for each position thereon, a second acquisition unit configured to acquire shape characteristic data representing characteristics of a shape of the target object for each position thereon, and a determination unit configured to determine a first recording amount of a first recording material and a second recording amount of a second recording material based on the color data, the shape characteristic data, and any one of a measurement result, a function calculated based on the measurement result, and a table generated based on the function. The measurement result is obtained by measuring color and shape characteristics of a plurality of types of patches formed by recording the second recording material on the first recording material recorded on a recording medium.
Abstract: A processor randomly selects a page image group corresponding to a predetermined number of pages, such as five pages, from scan images of all the pages of a book, and clips a predetermined area (evaluation area) from each of the selected page images. Subsequently, the processor performs, on each clipped image, color correction and compression at a compression rate in accordance with an image quality specified via a user interface, and derives the data volume of each clipped image subjected to the processing. In addition, based on the data volumes of the clipped images subjected to the processing, the processor derives estimated one page data volumes. Then, by using the estimated one page data volumes, the processor derives an estimated data volume of a digital book corresponding to the total pages of the book.
Abstract: A color conversion processing apparatus that converts a signal value of an input image into an output value of an actual color material used in an image forming apparatus, and includes: an acquisition unit configured to acquire a printing setting for the input image; and a conversion unit configured to convert the signal value of the input image into the output value of the actual color material in accordance with the acquired printing setting, and the conversion unit performs the conversion while maintaining a relationship between the signal value of the input image and output values of a virtual color material, the number of virtual color materials is smaller than the number of actual color materials and the respective virtual color materials have respective densities corresponding to respective wavelength bands obtained by dividing a wavelength range reproduced by the actual color materials being output into a plurality of wavelength bands, the output values of the plurality of virtual color materials are
Abstract: An image forming apparatus includes a printing device, a storage device, in which unevenness correction data indicating a corrected pixel value in association with each input pixel value are stored, and a processor. The processor is configured to determine, among pixels indicated by raster image data of an image to be printed, edge pixels corresponding to an edge image portion and non-edge pixels corresponding to a non-edge image portion, carry out unevenness correction on the raster image data selectively with respect to the determined non-edge pixels, using the unevenness correction data stored in the storage device, generate print image data based on the raster image data subjected to the unevenness correction, and control the printing device to print the image based on the generated print image data.
Abstract: Provided are a control apparatus, an image processing method and a non-transitory recording medium. A hardware processor of the control apparatus controls the amount of color materials to be used in printing a source image together with a white base by adjusting pixel values of multi-valued pixels forming the source image and white base, and converts the multi-valued pixels into two-valued pixels corresponding to colors of the color materials of the source image and two-valued white pixels. In controlling the amount of color materials, the hardware processor, for each multi-valued pixel of the white base, defines the pixel value such that colored two-valued white pixels exist in a coverage ratio being equal to or greater than the total coverage ratio of the color materials of the source image. The hardware processor rearranges the two-valued white pixels so that colored two-valued white pixels are located at all the colored pixel positions.
Abstract: An image forming apparatus includes an image generating unit for generating a job image, a color verification image generating unit, a color converting unit for performing the same color conversion on the job image and the color verification image, a printing unit for printing the job image and the color verification image subjected to the color conversion, a colorimetry device for measuring the colors of a printout of the color verification image, a storage unit, a storing control unit for storing the job image in the storage unit in association with the color verification image and colorimetrical values thereof, and a reprinting control unit, wherein the printing unit performs a test print of the stored color verification image before reprinting, and the reprinting control unit compares colorimetrical values obtained during the test print with stored past colorimetrical values and outputs color differences.
Abstract: Techniques for removal of interference patterns from digital images are described, in which a spatially-adaptive filter is applied to a pixel based on a context of the pixel. In an example, an edge of an object in a digital image is located in a digital image creation system. Then, context data is generated for a pixel in the digital image. The context data includes a distance from the edge of the object to the pixel. The digital image creation system can also generate color data and luminance data for the pixel, representing a similarity of color and luminance between the pixel and surrounding pixels within the digital image. Then, the digital image creation system constructs a spatially-adaptive filter for the pixel based on the context data for the pixel. The digital image creation system removes an effect of the interference pattern at the pixel in the digital image by applying the spatially-adaptive filter to the pixel.
Abstract: A color conversion apparatus includes a hardware processor that obtains a scanner profile created on the basis of measured RGB values and corresponding measured colorimetric values of patches in a first color chart, and creates a table including correction amounts of RGB values, each according to the level of flare estimated for a patch and each associated with an RGB-value difference and a patch-size difference, on the basis of RGB values of patches in the first color chart and RGB values of patches in a specific chart. The specific chart is created by using a part of the patches in the first color chart with the RGB value or patch size being changed. The hardware processor further corrects measured RGB values of patches in a second color chart with the table, and convers the corrected RGB values into colorimetric values with the scanner profile.
Abstract: An image reading device includes: a scanner glass; photo-sensors arranged at intervals in a main scanning direction to read a document conveyed in a sub-scanning direction; an adjuster that adjusts the size of an overlapping area between a first and second image obtained by neighboring photo-sensors, the overlapping area constituting a first area of the first image and a second area of the second image; a superimposing portion that shifts either one of images of the first and second area to the other one; a judgment portion that judges whether the images having different focal depths exist based on the degree of matching between the first and second area; and a detector that detects a foreign body on the scanner glass platen by detecting a continuous image stretching in a document conveying direction in both of the images having different focal depths, if the images having different focal depths exist.
Abstract: A method of controlling an image forming apparatus having a scanner that scans a document to obtain an image of the document as the image and a printer that prints an image on a sheet. The method includes performing an authentication processing for authenticating a user that uses the image forming apparatus, causing the scanner to scan a document in accordance with a copy instruction by the authenticated user, obtaining a month, day, and time on which the image obtained by scanning the document with the scanner is printed by the printer, scrambling identification information of the authenticated user using at least one of the obtained month, day, and time, and causing the printer to print, on a sheet, (i) the image obtained by scanning the document with the scanner, (ii) one or more characters obtained by scrambling the identification information, and (iii) the obtained month, day, and time.
Abstract: A lattice point group generating method generates a group of pre-color conversion lattice points to be contained in a color conversion table for conversion of colors in a color space having three channels to colors in another color space. The method includes generating sequences and generating lattice points. The generating sequences generates three van der Corput sequences in which the number of terms is equal to a quotient obtained by subtracting a specified number from a maximum number of lattice points allocatable to the color conversion table and dividing the difference by 12 or 6, and whose basis is a positive integer greater than or equal to 2. The generating lattice points generates lattice points each located at coordinates including terms in the same ordinal number out of the three respective van der Corput sequences for six possible associations of the three van der Corput sequences with the three channels.
Abstract: A print system may include a print engine, a processing device and programming instructions to halftone an electronic document to be printed. The system may receive an input image representing the electronic document to be printed, use a first and second threshold array, which are flipped to each other, to halftone the input image to generate a first and second set of data, respectively, then combine the first and second set of data to generate a halftoned image. In combining the first and second set of data, each dot in the halftoned image may represent full saturation if the corresponding dot in at least one of the first and second set of data represents full saturation, or white if the corresponding dots in both the first and second set of data are white. The system may use the same halftoning method for a monochrome or color document.
Abstract: An image reading device, which may be incorporated in an image forming apparatus, includes an image reader, a color reference body, a biasing body, a reading gap forming device, and a driving device. The image reader reads an image of an original document. The color reference body has a white reference face to position facing the image reader within a predetermined range in a document width direction. The biasing body biases the color reference body to the image reader. The reading gap forming device forms a reading gap while receiving a biasing force from the biasing body on the outside of the predetermined range. The driving device has a force drive transmission body engaged with a center of the color reference body in the document width direction and drives the color reference body in the document width direction at the center via the force drive transmission body.
December 14, 2016
Date of Patent:
September 4, 2018
RICOH COMPANY, LTD.
Koji Hatayama, Tatsuaki Nagano, Takayuki Andoh, Kaoru Tada, Munekazu Hirata, Yasunobu Youda
Abstract: An image reading apparatus includes a light irradiator, an optical system and a photoelectric converter. The optical system includes a reflection mirror unit and an aperture unit. The reflection mirror unit includes first and second reflection areas successively provided in a main scanning direction. The aperture unit includes a light shielding portion and first and second light passing holes for allowing the passage of the light reflected by each of the first and second reflection areas. The photoelectric converter includes a light receiving surface having first and second light receiving areas configured to receive the light passed through each of the first and second light passing holes and successively arranged in the main scanning direction. A length of the light receiving surface along the main scanning direction is set to be equal to or longer than that of the image reading area along the main scanning direction.
Abstract: A printing system is disclosed. The printing system includes a color management unit including one or more color caches to store input colors and corresponding output colors and a color engine (CE) to receive input colors and perform Force-K transformations to map near black input colors into pure black output colors by dynamically identifying the near black input colors based on chroma values and effective output values.
December 19, 2016
Date of Patent:
August 21, 2018
Ricoh Company, Ltd.
Vincent William Ferreri, Walter F. Kailey, Larry M. Ernst, Claudiu Gabriel Cebuc
Abstract: An image processing apparatus is caused to execute adjustment processing for an image; generate a soft proof image based on the image, a parameter adjusted in the adjustment processing, and characteristic information on a printing apparatus; display the soft proof image on a screen; and store the parameter of the adjusted image for which the adjustment processing is performed while the soft proof image is being displayed on the screen, and information relating to the printing apparatus, in association with the image.
Abstract: An disclosed image processing apparatus reproduces an input pixel expressed by a gray level through a printing process performed on a plurality of segmented regions of the input pixel, based on an output pattern. The image processing apparatus includes: a duplicator configured to duplicate the input pixel into at least two pixels; a storage configured to store a plurality of tables, each of the plurality of tables associating the gray level and an output pattern of one of the duplicated pixels, such that a plurality of output patterns exist with respect to each gray level; and a controller configured to control a plurality of output regions, based on the output pattern corresponding to the gray level of the input pixel in accordance with a table selected for each of the duplicated pixels, the plurality of output regions corresponding to the plurality of segmented regions of each of the duplicated pixels.