Canon Kabushiki Kaisha

Shoei Moribe

Hisashi Ishikawa

Takashi Ochiai

Yusuke Yamamoto

Hirokazu Tanaka

Yumi Yanai

Tsukasa Doi

Toshiyuki Dobashi

Shigeo Kodama

Yuta Ikeshima

Akitoshi Yamada

Takuya Shimada

Naoya Takesue

Ryosuke Otani

An image forming apparatus according to the present disclosure stores image data of an image having a plurality of regions, the plurality of regions having stepwise different densities, including a first region, a second region, and a third region between the first region and the second region, and satisfying a relationship of a moisture amount in the first region<a moisture amount in the third region<a moisture amount in the second region, and forms the stored image data on a print medium.

Image forming apparatus for forming stored image data on a print medium, image forming method, and non-transitory computer-readable storage medium

An image processing apparatus inputs a plurality of multi-valued data corresponding to a plurality of color materials, and quantizes each of the plurality of multi-valued data and generate a plurality of quantization data each indicating recording or non-recording of a dot on a recording medium by each of the plurality of color materials. A plurality of dot patterns of the plurality of color materials recorded based on the plurality of quantization data generated have peaks at different deviation angles in power spectra in a frequency domain and have blue noise characteristic or a green noise characteristic.

Image processing apparatus, threshold matrix generation apparatus, control methods therefor, recording apparatus, and non-transitory computer-readable storage medium

By an image forming apparatus comprising a reading unit configured to read a sheet on which a chart image is printed, the chart image including a first print pattern using a first color ink and a second print pattern using a second color ink whose color is different from the first color, containing at least part of the first print pattern, and having a predetermined density and a detection unit configured to detect deformation of the sheet in an area of the sheet based on a difference between a moisture amount in a portion corresponding to an area in which the chart image in the read image obtained by the reading unit is printed and a moisture amount in a portion corresponding to a non-printing area, determination of cockling is performed with a high accuracy.

Image forming apparatus, control method for image forming apparatus, and storage medium

An image processing apparatus converts a first combination including color signals respectively corresponding to first ink, second ink, and third ink, which are input to be recorded in a first area on a recording medium into a second combination including color signals respectively corresponding to the first ink, the second ink, and the third ink, and converts a third combination including color signals respective corresponding to the first ink, the second ink, and the third ink which are input to be recorded in a second area on the recording medium into a fourth combination including color signals respectively corresponding to the first ink, the second ink, and the third ink, wherein a difference between a color of a first image and a color of a second image is reduced and a difference between a frequency of the first image and a frequency of the second image is reduced.

Image processing apparatus, image processing method, and storage medium which reduce a color difference and a frequency difference between two images

The present invention provides an image processing device that reproduces the color of an input image more faithfully under different environment illumination without the need to prepare a different signal separation LUT for different environment illumination. An image processing device in one embodiment of the present invention generates data for generating an overlap image by overlapping an image formed by an image forming device and an image projected by an image projection device. The image processing device includes a generation unit configured to, based on input image data, generate first image data for the image forming device and second image data for the image projection device, a first acquisition unit configured to acquire environment illumination information relating to environment illumination in generating the overlap image, and a correction unit configured to correct the second image data based on the environment illumination information.

Image processing device, image display system, image processing method, and program

An image processing apparatus obtains a plurality of measured values obtained by measuring a measurement image; and replaces a first measured value with a value based on a second measured value. The first measured value being included in the plurality of measured values and being unsuitable for identifying the density characteristic, and the second measured value being included in the plurality of measured values and being suitable for identifying the density characteristic.

Image processing apparatus, image processing method, and storage medium

An image processing apparatus operable to generate data for printing an image onto a printing medium using a plurality of color materials. The apparatus generates a plurality of color image data corresponding to the plurality of color materials based on image data; generates multinary color data corresponding to a combination of the plurality of color materials based on the plurality of color image data; and generates quantized data corresponding to each of the plurality of color materials based on the multinary color data and a threshold matrix. The apparatus generates the quantized data such that a color difference between a generated color in a case where a shift in a relative printing position does not occur and a generated color in a case where a shift in a relative printing position occurs is small.

Image processing apparatus and control method thereof generating quantized based on multinary color data and a threshold matrix

Multiple first gradation values corresponding respectively to the multiple inks are quantized to generate multiple first quantized values indicating printing or non-printing of dots with the respective inks. In this case, multiple second gradation values corresponding respectively to multiple multinary colors expressible by combinations of overlapping of the multiple inks are generated based on the first gradation values. Next, the multiple second gradation values are quantized to generate multiple second quantized values indicating printing or non-printing of dots of the respective multinary colors. Then, the first quantized values corresponding to the inks to be overlapped one on top of another to express the multinary colors are generated based on the second quantized values corresponding respectively to the multiple multinary colors.

An apparatus corrects a measurement value obtained by measuring a first image formed using a recording element that ejects ink, to identify a density characteristic of the recording element. The apparatus includes a first acquisition unit configured to acquire a second image obtained by measuring the first image, an identification unit configured to identify a boundary between regions in the second image, each of the regions corresponding to one of a plurality of head modules including the recording element, and a first correction unit configured to correct a measurement value of the second image based on the identified boundary.

Image processing apparatus, image processing method, and storage medium for correcting a measurement value using a recording element that ejects ink

An apparatus comprises a unit configured to generate gradation data corresponding to an achromatic color generated by combining two or more colors among a plurality of colors, for an excess amount of a total gradation value exceeding a predetermined value, the total gradation value being a sum of gradation values of the plurality of colors used for recording a pixel of interest, and generate gradation data corresponding to the plurality of colors, based on the generated gradation data corresponding to the achromatic color; and a unit configured to quantize the generated gradation data, and generate data to control recording of dots corresponding to the pixel of interest. The predetermined value is a gradation value indicating whether or not to record the dots in an overlapping manner, in case that the dots corresponding to the total gradation value are recorded.

Image processing apparatus, image processing method, and non-transitory computer-readable storage medium

A surface tension difference between a first ink and a third ink is smaller than a surface tension difference between the first ink and a second ink. A first gradation value for the first ink is quantized to generate a first quantized value, a second gradation value for the second ink is quantized to generate a second quantized value, and a third gradation value for the third ink is quantized to generate a third quantized value. The above quantization processing is performed such that, in a predetermined pixel region, the number of pixels for each of which the second quantized value and the third quantized value both indicate printing is greater than the number of pixels for each of which the first quantized value and the third quantized value both indicate printing.

Image processing method

An image processing apparatus corrects a measured value obtained by measuring a measurement image formed using a printing element configured to discharge ink, the measured value being used to identify a density characteristic of the printing element. The image processing apparatus obtains a measured value; and corrects the measured value based on a density of the measurement image.

Image processing apparatus, image processing method, and storage medium for obtaining density characteristics to reduce density unevenness

An object of the present disclosure is to reduce density unevenness and streaks of an image that is printed in a case where it is not possible to implement sufficient correction only by the correction for a defective nozzle. One embodiment of the present invention is an image processing apparatus that performs processing for an input image for an image forming apparatus performing printing on a printing medium by using a print head in which a plurality of printing elements is arrayed, the image processing apparatus including: a storage unit configured to store density characteristic information indicating an output density for each tone for each of the printing elements; a target value acquisition unit configured to acquire a target characteristic indicating a target value for each tone; and a first correction unit configured to correct the input image based on the density characteristic information and the target value.

Image processing apparatus, image processing method and storage medium

An image is printed by using a first, second and third ink. A surface tension difference between a first ink and a third ink is smaller than a surface tension difference between the first ink and a second ink. A first gradation value for the first ink, a second gradation value for the second ink and a third gradation value for the third ink are quantized to generate a first quantized value, a second quantized value, and a third quantized value respectively. This quantization processing is performed such that, the number of pixels for each of which the first quantized value indicates printing, a the second quantized value indicates non-printing and the third quantized value indicates non-printing is greater than the number of pixels for each of which the first quantized value indicates printing and at least the second quantized value indicates printing or the third quantized value indicates printing.

An image processing apparatus performs image processing to print a color materials of a first color and a second color. When a sum of a first gradation data for the first color and a second gradation data for the second color is equal to or smaller than the maximum value of thresholds of a first threshold matrix, a generation unit generates a second quantization data for the second color based on a result of comparing the second gradation data with a second threshold. When the sum is greater than the maximum value, the generation unit generates third gradation data by subtracting the maximum value from the sum and generates the second quantization data based on a result of comparing the third gradation data with the first threshold or a result of comparing a difference between the second gradation data and the third gradation data with the second threshold.

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Tokyo, Japan

Shoei Moribe