Abstract: A multi-beam image forming apparatus and a method using the same. The image forming apparatus includes: an image process module to divide first image data into a plurality of second image data; a light scanning unit to scan the plurality of second image data using a plurality of laser beams; and a controller to control the formation of an electrostatic latent image of the first image data on a photosensitive body in an overlapping manner, using at least two of the plurality of laser beams.

Abstract: A method of printing a text with an apparatus using channels is provided. The method includes determining whether print data corresponds to a specified text by determining similarities between channels of print data, and determining a degree of flatness of one of the channels, searching for a boundary area in the print data if the print data is determined to correspond to the specified text, and reducing some of the channels at the boundary area, and compensating for the one of the channels by a density of the reduced channels if the print data is determined to correspond to the specified text.

Abstract: A method of printing a text with an apparatus using channels is provided. The method includes determining whether print data corresponds to a specified text by determining similarities between channels of print data, and determining a degree of flatness of one of the channels, searching for a boundary area in the print data if the print data is determined to correspond to the specified text, and reducing some of the channels at the boundary area, and compensating for the one of the channels by a density of the reduced channels if the print data is determined to correspond to the specified text.

Abstract: An image processing method and an image processing apparatus converts a binary image into a grayscale image by increasing the size and information quantity of the binary image. The image processing method includes generating a plurality of lookup tables having multiple gray level values assigned to a predetermined pattern of the binary image such that the gray level is retrieved from the plurality of lookup tables depending on the context of the block being processed. The binary image may be converted into the grayscale image by applying the gray value of one of the plurality of lookup tables that corresponds to the context, such as the frequency components of the binary image. With this configuration, since the size and information quantity of an image can be reduced for transmission, it is possible to prevent deterioration of image quality when the image is restored, while also printing at a higher speed.

Abstract: A method of controlling a color image forming apparatus, the method including: reducing the C, M, and Y channels from the boundary area of the composite black text, thereby allowing only the K channel to be left on the outermost boundary of the composite black text; and compensating for the K channel by the density of the reduced C, M, and Y areas, so that image distortion generated at the boundary of the composite black text is compensated for, resulting in increased image quality of the printed image of the composite black text.

Abstract: An image forming apparatus provides enhancement of image quality. The image forming apparatus includes a window generating unit to generate a main window of a predetermined size using a Lines Per Inch (LPI) and an angle of a dithering mask, and to generate a plurality of subwindows within the generated main window, a determining unit to determine the presence of an edge area by applying the plurality of generated subwindows to a binary image and according to pixel values of the binary image that correspond to the subwindows, and a control unit to determine a dot size of a central reference pixel at the center of the main window, according to the presence and absence of the edge area. Because image quality is enhanced adaptively according to edge and smooth areas, print quality improves.

Abstract: A method of controlling a color image forming apparatus capable of preventing an image from being distorted at a boundary of a color image region due to mis-registration to improve printing quality. The method includes determining whether original image data is in a color image region, detecting boundary region information on a plurality of color channels when the original image data is in the color image region, selecting a channel to be extended using the detected boundary region information, and extending the selected channel.

Abstract: A multi-beam image forming apparatus and a method using the same. The image forming apparatus includes: an image process module to divide first image data into a plurality of second image data; a light scanning unit to scan the plurality of second image data using a plurality of laser beams; and a controller to control the formation of an electrostatic latent image of the first image data on a photosensitive body in an overlapping manner, using at least two of the plurality of laser beams.

Abstract: A multi-beam image forming apparatus and a method using the same. The image forming apparatus includes: an image process module to divide first image data into a plurality of second image data; a light scanning unit to scan the plurality of second image data using a plurality of laser beams; and a controller to control the formation of an electrostatic latent image of the first image data on a photosensitive body in an overlapping manner, using at least two of the plurality of laser beams.

Abstract: An image forming apparatus provides enhancement of image quality. The image forming apparatus includes a window generating unit to generate a main window of a predetermined size using a Lines Per Inch (LPI) and an angle of a dithering mask, and to generate a plurality of subwindows within the generated main window, a determining unit to determine the presence of an edge area by applying the plurality of generated subwindows to a binary image and according to pixel values of the binary image that correspond to the subwindows, and a control unit to determine a dot size of a central reference pixel at the center of the main window, according to the presence and absence of the edge area. Because image quality is enhanced adaptively according to edge and smooth areas, print quality improves.

Abstract: An image forming apparatus includes a clock generation unit to generate a plurality of unit pulse signals having frequencies which are multiples of a reference clock signal when print data having a higher resolution than a reference resolution is inputted to the image forming apparatus; and an output signal generation unit to divide the print data into plural units by applying the plurality of unit pulse signals to the print data, to detect successive pixels neighboring each other at a boundary between two of the respective units of print data, and to generate an output signal so that the successive pixels detected at the boundary form one dot.

Abstract: An image forming apparatus to improve image quality. The image forming apparatus includes a window control unit to generate a window of a predetermined size using a lines per inch (LPI) value of a dithering mask and an angle, and to detect locations of a center reference pixel and neighboring reference pixels in the window, a weighting set unit to apply weighted values to the reference pixels based on locations of the detected center reference pixel and the neighboring reference pixels, and a control unit to determine a dot size of the center reference pixel corresponding to weighted values corresponding to locations of black pixels of the center reference pixel and neighboring reference pixels. Accordingly, image quality is improved by generating dots corresponding to a plurality of gray levels based on weighted values.

Abstract: A method of controlling a color image forming apparatus capable of preventing an image from being distorted at a boundary of a color image region due to mis-registration to improve printing quality. The method includes determining whether original image data is in a color image region, detecting boundary region information on a plurality of color channels when the original image data is in the color image region, selecting a channel to be extended using the detected boundary region information, and extending the selected channel.

Abstract: A method of controlling a color image forming apparatus, the method including: reducing the C, M, and Y channels from the boundary area of the composite black text, thereby allowing only the K channel to be left on the outermost boundary of the composite black text; and compensating for the K channel by the density of the reduced C, M, and Y areas, so that image distortion generated at the boundary of the composite black text is compensated for, resulting in increased image quality of the printed image of the composite black text.

Abstract: An image forming device includes an input unit to receive binary data for each color being input; a generation unit to generate an synthesis window, by applying a window of a predetermined size to each of the binary data for each color and synthesizing each window region; an image process unit to expand an image, by applying a plurality of sub windows to the synthesis window; and a control unit to detect an edge region of the expanded image, extract dots corresponding to the edge region from the binary data for each color, and carry out reinforcement or deletion of the dots. Accordingly, the quality of an image deteriorated by color disagreement is improved by software.

Abstract: An image processing method and an image processing apparatus converts a binary image into a grayscale image by increasing the size and information quantity of the binary image. The image processing method includes generating a plurality of lookup tables having multiple gray level values assigned to a predetermined pattern of the binary image such that the gray level is retrieved from the plurality of lookup tables depending on the context of the block being processed. The binary image may be converted into the grayscale image by applying the gray value of one of the plurality of lookup tables that corresponds to the context, such as the frequency components of the binary image. With this configuration, since the size and information quantity of an image can be reduced for transmission, it is possible to prevent deterioration of image quality when the image is restored, while also printing at a higher speed.

Abstract: A multi-beam image forming apparatus and a method using the same. The image forming apparatus includes: an image process module to divide first image data into a plurality of second image data; a light scanning unit to scan the plurality of second image data using a plurality of laser beams; and a controller to control the formation of an electrostatic latent image of the first image data on a photosensitive body in an overlapping manner, using at least two of the plurality of laser beams.

Abstract: A method of and apparatus to enhance the printing quality of a laser printer, in which a window to define a binary image is generated using a plurality of Ipi values and angles of a dithering mask and the quality of a non-edge region is improved. The method of enhancing the printing quality of a laser printer using a 1-bit gray process includes: receiving a binary image, a dithering mask, and a plurality of values of Ipi and angles of the dithering mask, wherein Ipi indicates the number of lines per inch; generating a window having a size of N×N pixels considering the received values of Ipi and angles; determining whether a binary image of N×N pixels, which is defined by the window, is an edge region or not using the window and the dithering mask; and enhancing the quality of a binary image of N×N pixels determined to be a non-edge region. Using a plurality of Ipi values and angles of the dithering mask improves the quality of color images, which require several channels for printing.