A Multi-Ink Color-Separation Algorithm Improving Printing Quality

2012 ◽  
Vol 263-266 ◽  
pp. 2195-2198
Author(s):  
Hong Jun Tang ◽  
Xiao Jie Xiu
Keyword(s):  
Color Space ◽  
Lookup Table ◽  
Color Management ◽  
Separation Algorithm ◽  
Mapping Problem ◽  
Color Separation ◽  
Printing Quality ◽  
Color Printing ◽  
Inkjet Printer ◽  
The One

Conventional color-printing systems often use three or more inks, such as CMY, CMYK or CMYKLcLm. When the inks hues exceeds three, such as CMYKRGB, CMYKOrG and so on, there is the usual color-management one-to-many mapping problem. An algorithm was developed for multi-inks printing in which the one-to-many mapping problem was overcome by dividing the standard color space into several sub-spaces, founding the relationships between the sub-spaces and the printing color-separations and building the lookup table. The algorithm was tested using a digital inkjet printer-Mutoh8000 of CMYKOrGB. Mutoh8000 prints separated color blocks using this algorithm were compared with a generic ICC profile for CMYKLcLm prints. The CMYK inks were common to both prints. The algorithm has been proved effective and improved color printing quality significantly.

Research on Multi-Color Separation Model Based on Polynomial Regression

2015 ◽  
Vol 731 ◽  
pp. 27-31 ◽  
Author(s):  
Hui Fang Yang ◽  
Yao Hua Yi ◽  
Ju Hua Liu ◽  
Xiao Ying Wang
Keyword(s):  
Polynomial Regression ◽  
Color Space ◽  
Separation Algorithm ◽  
Separation Technology ◽  
Color Separation ◽  
Color Printing ◽  
Printing Ink ◽  
Selection Of ◽  
Separation Model

In order to improve the quality of prints, we usually add additional OG or RGB ink on the basis of the four-color printing ink (CMYK) to increase the printing color gamut. After that, the conventional separation technology is no longer suit for multi-color printing, so the multi-color separation technology is put forward. Currently, the main multi-color separation method is color partition technology. It divided the color space into five or six partitions. Then each partition was subdivided into several cells, and then established the polynomial color separation model for each cell. In this paper, we improved the selection of samples and cell search method. The experimental results showed that the color separation algorithm had high color separation accuracy and stability and could meet the demand of high precision multi-color printing.

A Black Generation Method for Black Ink Hiding Infrared Security Image

2012 ◽  
Vol 262 ◽  
pp. 9-12 ◽  
Author(s):  
Chao Li ◽  
Cai Yin Wang ◽  
Shu Jie Wang
Keyword(s):  
Near Infrared ◽  
Lookup Table ◽  
Source Image ◽  
Ir Camera ◽  
Color Separation ◽  
Infrared Spectral ◽  
Series Of Experiments ◽  
Color Printing ◽  
Different Response ◽  
Gray Component Replacement

In the multi-color printing, the four inks used are cyan, magenta, yellow and black, which have different response in the near infrared spectral area, in which the black with CMK color inks have no response while the black with K color ink has a good response. But two kinds of black are both visible and equivalent under daylight. Based on this principle and gray component replacement (GCR) theory, this paper introduces a black component generation method for black ink hiding infrared security image. Firstly, we establish a color lookup table for GCR and find the substitution relation between K and CMY. Secondly, the source image is color-separated with the mask which is the security image. The source image is firstly converted to CMY color format data words. The black value of each pixel for security image is detected and treated as GCR value of the corresponding pixel for source image. Then CMY values are found in GCR LUT and subtracted from three primary CMY values. And an adjustment coefficient is employed for color correction. Thirdly, the color separation image is printed. In daylight the visual effect of printed image is the same as that of source image, but the security image is detected by IR camera. Finally, a series of experiments are performed on HP Color LaserJet CP2035 printer. Experimental results show that the proposed method is promising and feasible for black ink hiding IR security image.

The Experimental Research on Tiled Multiple Projectors Displaying Based on ICC Mechanism

2012 ◽  
Vol 262 ◽  
pp. 80-85
Author(s):  
Zhen Liu ◽  
Ming Zhu ◽  
Jian Yu
Keyword(s):  
Color Space ◽  
Calibration Method ◽  
Lookup Table ◽  
Color Management ◽  
Development Platform ◽  
Color Calibration ◽  
Color Uniformity ◽  
Table Model ◽  
Multiple Projectors ◽  
Interpretation Algorithm

The research on the color uniformity of the tiled multiple projectors display systems gets more and more attention. In this paper, taking the tiled two-projector display system as a case, the color calibration method based on ICC color management mechanism was proposed and used to achieve the color uniformity the non-overlapping projected region firstly. And the sectoring parabola interpretation algorithm was used to achieve the color uniformity of the overlapping projected region. The research content of this paper includes: ①The ICC profile of the projector based on matrix model was calculated and generated; ②The ICC profile of the projector based on 3-dimensions lookup table model was calculated and generated; ③The color-matching precision of the above two types of ICC profiles were compared by the color space conversion experiment, and the feasibility of color calibration method of the non-overlapping projected region based on ICC mechanism was verified; ④Finally, the feasibility of color calibration method of the overlapping projected region based on sectoring parabola interpretation algorithm was verified by Quest3D development platform.

Developing an Inkjet Printer I: RGB Image to CMY Ink Amounts - Image Processing and Color Management

2020 ◽  
Vol 2020 (15) ◽  
pp. 350-1-350-10
Author(s):  
Yin Wang ◽  
Baekdu Choi ◽  
Davi He ◽  
Zillion Lin ◽  
George Chiu ◽  
...  
Keyword(s):  
Image Processing ◽  
Low Cost ◽  
Experimental Results ◽  
Color Management ◽  
Finger Nail ◽  
Inkjet Printer ◽  
Rgb Image ◽  
Novel Algorithm

In this paper, we will introduce a novel low-cost, small size, portable nail printer. The usage of this system is to print any desired pattern on a finger nail in just a few minutes. The detailed pre-processing procedures will be described in this paper. These include image processing to find the correct printing zone, and color management to match the patterns’ color. In each phase, a novel algorithm will be introduced to refine the result. The paper will state the mathematical principles behind each phase, and show the experimental results, which illustrate the algorithms’ capabilities to handle the task.

Research and Application on Screen Soft Proofing Technology in Printing Quality Control

2012 ◽  
Vol 262 ◽  
pp. 263-268
Author(s):  
Zhan Jun Si ◽  
Jia Wang ◽  
Chong Gu
Keyword(s):  
Quality Control ◽  
Good Effect ◽  
Color Management ◽  
Actual Situation ◽  
Testing Scheme ◽  
Printing Quality ◽  
Display Technology ◽  
Soft Proofing ◽  
Display Performance

In recent years, screen soft proofing has matured with the development of color management and display technology, and it has become the direction of printing development and the key of promotion. This article aimed at raising a testing scheme of display performance and adjusting scheme of corresponding display parameters, on this account to test the professional display’s performance, adjust display parameters and make color management. At the same time with reflecting the actual situation of display, a stable and accurate color reproduction environment was provided for screen soft proofing. After that, evaluations were carried out to evaluate printing quality of screen soft proofing on the condition that display’s performance was good, consequently the differences between proofing effects and final printing were studied. The result shows that this testing scheme of display performance can reflect the truth of display which is tested in this paper, the display after adjusted and color management according to this scheme shows good effect in the ability of screen analog proofing original, it can approach the requirements of the printing proofing.

scholarly journals Improving Discrimination in Color Vision Deficiency by Image Re-Coloring

Sensors ◽  
2019 ◽  
Vol 19 (10) ◽  
pp. 2250 ◽  
Author(s):  
Huei-Yung Lin ◽  
Li-Qi Chen ◽  
Min-Liang Wang
Keyword(s):  
Image Enhancement ◽  
Color Vision ◽  
Subjective Evaluation ◽  
Color Space ◽  
Natural Images ◽  
Natural Scene ◽  
Color Vision Deficiency ◽  
Color Separation ◽  
Color Deficiency ◽  
Natural Scene Images

People with color vision deficiency (CVD) cannot observe the colorful world due to the damage of color reception nerves. In this work, we present an image enhancement approach to assist colorblind people to identify the colors they are not able to distinguish naturally. An image re-coloring algorithm based on eigenvector processing is proposed for robust color separation under color deficiency transformation. It is shown that the eigenvector of color vision deficiency is distorted by an angle in the λ , Y-B, R-G color space. The experimental results show that our approach is useful for the recognition and separation of the CVD confusing colors in natural scene images. Compared to the existing techniques, our results of natural images with CVD simulation work very well in terms of RMS, HDR-VDP-2 and an IRB-approved human test. Both the objective comparison with previous works and the subjective evaluation on human tests validate the effectiveness of the proposed method.

A Comparative Study of Optimal Design for an Inkjet Printer Tube With and Without Performance Variations

2005 ◽  
Vol 128 (4) ◽  
pp. 824-826
Author(s):  
Jeff Thielman ◽  
Ping Ge
Keyword(s):  
Pressure Drop ◽  
Comparative Study ◽  
Optimization Strategy ◽  
Printing Quality ◽  
Low Stiffness ◽  
Inkjet Printer ◽  
Increasing Demand ◽  
New Generation ◽  
Performance Variations ◽  
Selection Of

As a new generation of printing technology, thermal inkjet (TIJ) has been widely adopted to meet the increasing demand for high printing quality and efficiency at an affordable price. High air barrier tubes play an important role in the reliable operation of the printhead in a commercial thermal inkjet printer. Desired tube qualities include low stiffness and low pressure drop, along with others. Tube stiffness and pressure drop can be lowered through the selection of proper tube layer configuration, geometry, and material properties. However, the existing tube design practice is highly heuristic and design results are not optimal. In this work, using TIJ design as a real world example, a comparative study is conducted to support the use of formal methods in design applications previously governed by heuristic/trial-and-error approaches. Two cases using different optimization strategies are investigated: Case A—performance-based optimization strategy; and Case B—robust design-based optimization strategy. A comparison of their results with the current practice shows that the optimization strategies can greatly improve the efficiency of the current tube design process. More important, the optimization strategy with variation consideration yields robust results and provides much richer design knowledge to support designers with various experiences to make better decisions.

Extracting Golden Area from Image Based on Canny Operator

2015 ◽  
Vol 731 ◽  
pp. 201-204
Author(s):  
Ying Wu ◽  
Xiu Ping Zhao ◽  
Yang Jin ◽  
Xi Zhang
Keyword(s):  
Image Segmentation ◽  
Color Space ◽  
Threshold Value ◽  
Segmentation Algorithm ◽  
Canny Operator ◽  
Small Areas ◽  
Color Separation ◽  
Lab Color Space ◽  
Canny Algorithm ◽  
Image Segmentation Algorithm

This paper researched application of Canny algorithm on the color separation of golden image , to generate a separated golden image plate base on the extraction of golden area, so as to get the effect more closer to the real metallic. Canny algorithm is based on the gray-scale image segmentation algorithm. The image is mapped from RGB to Lab color space. According to the color attributes of b, the golden target regions are extracted using Canny algorithm. But it’s difficult to get the closed target boundary outlet by Canny algorithm, so this paper modified image segmentation algorithm. Firstly, the image is filtered by Canny operator; secondly, small areas on the Canny processed image are removed by using some pre-determined threshold value.; then processed the image through using smoothing and sharping method so to make inner area of image more smooth meanwhile improving boundary sharpness. The experimental results showed that the method based on Canny operator is very suitable for golden area extraction from a image. The golden target-regions can be closed boundary outlet, which makes the golden areas are more accurate and continuous.

scholarly journals Ice crystal number concentration from measurements of lidar, cloud radar and radar wind profiler

2019 ◽  
Author(s):  
Johannes Bühl ◽  
Patric Seifert ◽  
Martin Radenz ◽  
Holger Baars ◽  
Albert Ansmann
Keyword(s):  
Particle Number ◽  
Number Concentration ◽  
Lookup Table ◽  
Wind Profiler ◽  
Ice Crystal ◽  
Fall Velocity ◽  
Magnitude Comparison ◽  
Cloud Radar ◽  
Order Of Magnitude ◽  
The One

Abstract. A new method for the retrieval of ice particle number concentrations from combined active remote-sensing measurements of Raman lidar, cloud radar and radar wind profiler is presented. We exploit – for the first time – measurements of terminal fall velocity together with radar reflectivity factor and/or lidar-derived particle extinction coefficient in clouds for retrieving the number concentration of pristine ice particles with presumed particle shapes. A lookup table approach for the retrieval of the properties of the particle size distribution from observed parameters is presented. Analysis of methodological uncertainties and error propagation are performed, which shows that a retrieval of ice particle number concentration is possible within the order of magnitude. Comparison between a retrieval of number concentration based on terminal fall velocity on the one hand and lidar and cloud radar on the other shows agreement within the uncertainties of the retrieval.

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