Abstract:
An image forming method for performing multilevel halftoning of a scanned image is provided to print the image maximally close to an original image by performing the halftoning of the scanned image with multilevel. A change degree for a pixel value of multiple pixels is evaluated for a continuous tone image comprising the multiple pixels by finding convolution of the pixel value of the neighboring pixels(S120). The continuous tone image is converted into a halftone image to make dots corresponding to each neighboring pixel dispersed and formed in a specific paper as the change degree of the evaluated pixel value gets higher(S160). The pixel values of the pixels having the change degree smaller than a specific value are averaged(S140).
Abstract:
사전에 출력되는 테스트화상들을 참조하여 최적의 원화상 출력환경을 설정할 수 있는 화상형성장치 및 출력환경 설정방법이 제공된다. 본 화상형성장치는, 원화상을 기설정된 복수의 출력환경에 따라 각각 변환처리하여 복수의 테스트화상을 생성하는 화상데이터 처리부, 생성된 복수의 테스트화상을 용지에 출력하는 화상출력부, 출력된 복수의 테스트화상 중 어느 하나를 선택하기 위한 키입력부 및 선택된 테스트화상의 출력환경을 원화상 출력환경으로 설정하는 제어부를 포함한다. 이에 의해, 사전출력되는 각기 다른 출력환경의 테스트화상들을 비교/선택함으로서 최적의 원화상 출력환경을 설정할 수 있게 되어, 사용자는 테스트화상을 출력할때마 출력환경을 개별적으로 설정할 필요가 없어진다.
Abstract:
A method of revising an edge region, an image forming device using the same and a computer readable medium are provided to predict in advance and revise an error occurring in a region where a plurality of colors cross each other by software. An edge region detection unit(110) detects an edge region from a half-toned image. Here, the edge region represents an edge portion of an image that is in contact with another image or a background. An edge region classification unit(120) classifies the edge region detected by the edge region detection unit into an edge region where a plurality of colors overlap each other and an edge region where a single color exists. A color adjustment unit(130) adjusts colors with respect to the edge region where the plurality of colors overlap each other in accordance with an existence/nonexistence of a black color in the edge region, and adjusts the edge region of the single color with respect to the edge region where the single color exists.
Abstract:
A mobile terminal and a scheduling method using a navigation terminal are provided to solve a problem that a conventional schedule function provides only schedule information at a corresponding alarm time, so a user can merely check the schedule information through his mobile terminal and to provide a navigation service to a user according to schedule information by transmitting the schedule information stored in the mobile terminal to the navigation terminal. A mobile terminal(100) sets an inputted schedule and a navigation service(S301). When the date and time set for the schedule arrive, the mobile terminal(100) provides an alarm sound(S302). The mobile terminal(100) pairs with a navigation terminal(300) located in a Bluetooth network area and transmits local data stored in a schedule(S304). When the navigation terminal(300) detects local information selected by a user(S306), it calculates a path up to the selected local information from a current location and displays it(S307).
Abstract:
An electrophotographic image forming apparatus and its half-toning correction method are provided to obtain optimum half-toning results reflecting hardware characteristics to its maximum level by complementing half-toned printed data by dot patterns reflecting printing characteristics of an engine. A storage unit(130) stores a plurality of dot patterns reflecting printing characteristics of an engine. A comparison region dividing unit(140) divides the half-toned printed data into comparison regions having the same size as that of the dot pattern. A pattern extracting unit(150) compares dots of the comparison regions with the dot patterns and extracts a proper dot pattern. A pattern changing unit(160) changes the comparison regions to have the extracted dot pattern. The pattern extracting unit(150) extracts a dot pattern in which dots are arranged at the same positions as those in the comparison regions from the dot pattern having the same number of dots in the divided comparison regions among the plurality of dot patterns.
Abstract:
모아레(moire) 패턴을 저감하기 위한 스크린 설계 방법 및 장치가 개시된다. 이 방법은 설정된 스크린 주파수, 스크린 각도 및 해상도에 상응하는 스크린 파라미터를 검출하는 단계; 다수의 마이크로 닷(micro dot)이 군을 형성한 클러스터 닷(cluster dot)들 각각의 중심이 되는 닷 센터(dot center)들의 좌표들을 검출하는 단계; 상기 닷 센터들이 온(on) 되는 순서를 나타내는 닷 센터 순서를 결정하는 단계; 및 모아레(moire) 패턴에 대한 인간 시각의 인식 특성을 정량화 한 평가함수를 사용하여, 상기 마이크로 닷(micro dot)들의 온(on) 되는 순서를 나타내는 마이크로 닷 순서를 결정하는 단계를 구비하는 것을 특징으로 한다. 따라서, 본 발명에 따르면, 인간의 시각 특성에 기반한 평가함수를 사용하여 마이크로 닷의 순서를 결정함으로써, 모아레 패턴 및 화상형성의 품질을 저하시키는 패턴들의 발생을 방지하도록 한다.
Abstract:
A method and an apparatus for designing a screen are provided to prevent generation of moire pattern and deterioration of picture quality by determining micro dot order, using an evaluation function based on visual characteristic of human. Screen parameters are detected, wherein the screen parameters include a reference screen frequency, a reference screen angle, and a reference resolution(10). The coordinates of dot centers are detected, wherein the coordinates of dot centers indicate the centers of cluster dots each including a plurality of micro dots(12). A dot center order is determined, wherein the dot center order indicates a sequence in which the dot centers are turned on(14). A micro dot order indicating a sequence in which the micro dots are turned on is determined by using an evaluation function based on visual characteristic of human with respect to moire pattern(16).
Abstract:
An image processing apparatus and an image processing method are provided to perform the printing process at a high speed by performing a screening process through application of rational screen and irrational screen. A color separating unit(110) converts a continuous tone color image into plural middle images corresponding to plural colors. A first screening unit(120) divides a first middle image of the plural middle images into plural first screen cells, and performs the half-toning of the first screen cells. The first screen cells correspond to plural unit print regions and have the uniform size and shape. A second screening unit(130) divides a second middle image of the plural middle images into plural second screen cells, and performs the half-toning of the second screen cells. The second screen cells correspond to plural unit print regions and have the different size and shape.