Class / Patent application number | Description | Number of patent applications / Date published |
358520000 | Hue, saturation and luminance | 17 |
20080231921 | Image Processing Apparatus - An image processing apparatus that reduces a color of a document image to be printed. An image generation unit scans a document to generate image data. A hue determination unit determines a specific hue included in the image data and a hue becoming a complementary color of the specific hue. A color reduction unit reduces a color of the image data based on the specific hue and the hue becoming the complementary color of the specific hue. An output unit outputs the image data whose color is reduced on a recording medium. Image data that is of a hue in a predetermined range from the hue becoming the complementary color is replaced with the hue becoming the complementary color, and image data that is outside of the predetermined range is replaced with the specific hue. | 09-25-2008 |
20090002783 | IMAGE PROCESSING APPARATUS AND PROFILE GENERATING METHOD - Color compression processing capable of sufficiently maintaining a visual constant hue property even after the color compression processing is realized. There is provided a method for generating a profile used to convert a color of a first color reproduction range into a color of a second color reproduction range. The method includes dividing each of the first and second color reproduction ranges into a plurality of regions, performing color space conversion for individual regions in accordance with color space definitions unique to the individual regions, and generating a profile used to convert the color of the first color reproduction range into the color of the second color reproduction range based on color coordinates obtained through the color space conversion performed for individual regions. | 01-01-2009 |
20090002784 | IMAGE READING DEVICE AND READING-CHARACTERISTIC CORRECTION METHOD FOR IMAGE READING DEVICE - An image reading device for reading front and back sides of an original using different reading units has a simple configuration and is capable of matching the input-output characteristic of the front side and the input-output characteristic of the back side and reducing a difference between color on the front side and color on the back side. Based on image data of a color chart read by a front-side reading unit and image data of the color chart read by a back-side reading unit, the image reading device calculates and sets adjustment values for the front and back sides for individual hues of color patches of the color chart and performs adjustment for the front and back sides in accordance with adjustment values corresponding to hue of an original image when the original is read. | 01-01-2009 |
20090021809 | System and Method for Maintaining Hue Constancy - System and method for maintaining perceived hue constancy. A method for displaying an image includes receiving a color vector and associated image data, remapping the color vector to maintain a perceived hue constancy by adjusting a hue component of the color vector in response to a change in a lightness component or a chroma component of the color vector, providing the remapped color vector to a light source for display, and displaying image data associated with the color vector. The use of the constant hue curve ensures that the adjusting of the color vector maintains the perceived hue of the color vector, thereby helping to maintain image quality. | 01-22-2009 |
20090046332 | Color conversion apparatus and method - A color conversion apparatus receives first image data including first red-green-blue color data in which the possible values of the red, green, and blue components extend beyond the range from 0% to 100%. The first color data are analyzed into first hue region data, the magnitudes of which are adjusted according to the brightness and/or saturation of the first color data to obtain second and third hue region data. The gamut of colors of the first image data is detected, and matrix coefficients are generated according to the detected gamut. The matrix coefficients are used to perform a matrix operation on the second and third hue region data to obtain second color data, thereby converting the first image data to second image data with conversion characteristics appropriate for the gamut of colors of the first image data. | 02-19-2009 |
20090067017 | INPUT ADAPTIVE METHOD FOR COLOR TABLE LOOK-UP - The proposed systems and methods automatically select the node locations of a multi-dimensional lookup table transformation in accordance with the relative importance of multi-dimensional input values. Such importance, as an example could be quantified by the statistical distribution of the input data. Additionally, the proposed scheme is efficient and works for inputs of arbitrary dimensionality. Finally, the proposed method accounts the characteristics of the input-data and the geometry of the input space. The proposed systems and methods are generally applicable to a large number of practical scenarios including, but not limited to, color imaging applications where input adaptive color look-up tables are desired. | 03-12-2009 |
20090122372 | IMAGE PROCESSING DEVICE AND IMAGE PROCESSING METHOD - A converting unit converts a first color signal into a second color signal and a third color signal. A first correcting unit corrects a magnitude relation between hue angles of the third color signal such that a magnitude relation between hue angles of the second color signal corresponding to the first color signal is maintained in the hue angles of the third color signal. The first color signal is a device-dependent input red, green, blue color signal. The second color signal is a color signal of a hue, lightness, saturation color space. The third color signal is a color signal of CIECAM02 color space. | 05-14-2009 |
20090128871 | SYSTEMS AND METHODS FOR COLOR CORRECTION PROCESSING AND NOTIFICATION FOR DIGITAL IMAGE DATA GENERATED FROM A DOCUMENT IMAGE - Systems and methods for generating color corrected digital image data from a document image according to personal preferences of an identified user of the digital image copy. A color correction profile is provided defining color correction parameters for a particular identified user. The digital image copy is generated in accordance with the color correction profile by replacing problematic colors with alternate presentations as defined by the color correction parameters. The alternate presentations may include corrections to compensate for colorblindness of an identified user. The document image may be logically segmented to identify objects associated with each of a plurality of segments of the document image such as text, graphics, photographic images, etc. The color correction profile may define different color correction parameters to be associated with each defined type of segment. | 05-21-2009 |
20090147328 | METHOD AND APPARATUS FOR CHARACTERIZING AND CORRECTING FOR HUE SHIFTS IN SATURATED COLORS - A method for correcting for hue shifts includes parameterizing the conversion of long-medium-short (LMS) spectral sensitivities of the human eye to a human observer function, and applying a non-linear transformation between the LMS and human observer function in order to correct for the hue shifts. A system for correcting for hue shifts is also provided. The system includes a controller for parameterizing the conversion of LMS spectral sensitivities of the human eye to a human observer function and applying a non-linear transformation between the LMS and human observer function in order to correct for the hue shifts in the image. The system can also include an output device for presenting the hue corrected image | 06-11-2009 |
20090231645 | Image processing device and image processing method - An image processing device includes a determining unit that determines whether an intermediate parameter that is newly computed by an intermediate parameter computing unit or an intermediate parameter that is previously stored in an intermediate parameter storing unit is to be supplied to a color correcting unit depending upon an image forming condition. The color correcting unit performs color correction based on the intermediate parameter. | 09-17-2009 |
20100195173 | Methods and Systems for Hue Adjustment - Aspects of the present invention relate to systems and methods for color image hue shifting. Some aspects relate to processes by which reference hue values and corresponding hue shift values are used to modify color hue values in a non-perceptually-uniform color space. Some aspects relate to processes that generate a hue shift table for modifying image hue values. | 08-05-2010 |
20100202027 | IMAGE READING APPARATUS - A method is provided for processing image data read from a book document placed on a platen of an image reading apparatus. The method includes determining a background pixel of the image data based on a luminance difference or a color difference between neighboring pixel arrays, identifying a shadow region based on a luminance change between the neighboring background pixel arrays, discriminatively detecting a shadow of a binding portion and a shadow of a front edge in a document region with reference to a changing direction of shadow luminance, and performing a luminance correction on the shadow region according to characteristics of the shadows. | 08-12-2010 |
20110013242 | IMAGE READING APPARATUS, IMAGE FORMING APPARATUS, IMAGE INFORMATION CONVERSION METHOD AND COMPUTER READABLE MEDIUM - An image reading apparatus includes: a light source that generates light by synthesizing light from different illuminants and irradiates an irradiated object with the generated light; a reading unit that reads light irradiated by the light source and reflected by the irradiated object and generates image information in a first color space on the irradiated object; a color conversion unit that converts the image information in the first color space into image information in a second color space with a color conversion factor group; and a color conversion factor group setting unit that acquires from the reading unit the image information generated by using, as the irradiated object, a color sample formed in a color of light emitted by one of the illuminants, determines the color conversion factor group to be used, according to the acquired image information, and sets the color conversion factor group to the color conversion unit. | 01-20-2011 |
20110026088 | COLOR CONVERSION APPARATUS AND COLOR CONVERSION METHOD - A color conversion apparatus includes: an original data analyzing unit configured to extract background color information of an original and color information of a character and line drawing object on the background; a background color changing unit configured to change the background color of the original when necessary, on the basis of the result of comparing the background color information acquired from the original data analyzing unit with a preset threshold value; and a character and line drawing color correcting unit configured to change lightness of the character and line drawing color in a way that increases a lightness difference between the background color for printing and the character and line drawing color on the background when necessary, on the basis of the background color information of the original acquired from the original data analyzing unit, the background color information for printing acquired from the background color changing unit, and the character and line drawing color information on the background acquired from the original data analyzing unit. The color conversion apparatus contributes to saving of color material, reduction in load on a printer engine, prevention of stripping of color material, and prevention of deformation of paper. | 02-03-2011 |
20160112605 | COLOR CONVERTER, COLOR CONVERSION METHOD, AND RECORDING MEDIUM - A color converter includes a printing color value determining unit and a determination color value calculating unit. The determination color value calculating unit calculates a determination color value in such a way that a positional relationship of a input color value relative to a input peak value, a white color value showing a color value of white, and a black color value showing a color value of black is equal to a positional relationship of the determination color value relative to the determination peak value, the white color value, and the black color value. The printing color value determining unit determines, as a printing color value, the representative color value closest to the determination color value calculated by the determination color value calculating unit in the Voronoi diagram. | 04-21-2016 |
20160150127 | IMAGE FORMING APPARATUS AND METHOD FOR CORRECTING READ SIGNAL - An image forming apparatus, including: a first reading section which emits visible light to a sheet having an image formed thereon, receives light from the sheet and outputs a read signal having an intensity corresponding to an amount of the received light; a second reading section which emits light including at least ultraviolet light to a ground region of the sheet, receives light from the sheet and outputs a read signal having an intensity corresponding to an amount of the received light; and a correction section which corrects the read signal output from the first reading section by using the read signal output from the second reading section so that a color reproduced by the read signal output from the first reading section is consistent with a color observed by a user. | 05-26-2016 |
20180024899 | ELECTRONIC DEVICE, AND METHOD OF CONTROLLING ELECTRONIC DEVICE | 01-25-2018 |