We describe the main features of a system supporting the selection of color palettes for qualitative data representation, such as in supervised or unsupervised image classification. Based on visual interaction, the sy...
详细信息
We describe the main features of a system supporting the selection of color palettes for qualitative data representation, such as in supervised or unsupervised image classification. Based on visual interaction, the system provides effective tools for browsing the Munsell color space and setting perceptual constraints on the colors, which it then selects automatically. The system is now available for academic and nonprofit purposes.
In the paper we present the method that improves lossy compression of the true color or other multispectral images. The essence of the method is to project initial color planes into Karhunen-Loeve (KL) basis that give...
详细信息
ISBN:
(纸本)0819429112
In the paper we present the method that improves lossy compression of the true color or other multispectral images. The essence of the method is to project initial color planes into Karhunen-Loeve (KL) basis that gives completely decorrelated representation for the image and to compress basis functions instead of the planes. To do that the new fast algorithm of true KL basis construction with low memory consumption is suggested and our recently proposed scheme for finding optimal losses of KL functions while compression is used. Compare to standard JPEG compression of the CMYK images the method provides the PSNR gain from 0.2 to 2 dB for the convenient compression ratios. Experimental results are obtained for high resolution CMYK images. It is demonstrated that presented scheme could work on common hardware.
作者：
Franques, VTUSAF
Res Lab Munit Directorate Eglin AFB FL 32542 USA
Recently, a new image compression algorithm was developed which employs wavelet transform and a simple binary linear quantization scheme with an embedded coding technique to perform data compaction. This new family of...
详细信息
ISBN:
(纸本)081942840X
Recently, a new image compression algorithm was developed which employs wavelet transform and a simple binary linear quantization scheme with an embedded coding technique to perform data compaction. This new family of coder, Embedded Zerotree Wavelet (EZW), provides a better compression performance than the current JPEG coding standard for low bit rates. Since The Embedded Zerotree Wavelet coding algorithm emerged, all of the published coding results related to this coding technique are on monochrome images. In this paper the author has enhanced the original coding algorithm to yield a better compression ratio [2], and has extended the wavelet-based zerotree coding to color images. color imagery is often represented by several components, such as RGB, in which each component is generally processed separately. With color coding, each component could be compressed individually in the same manner as a monochrome image, therefore requiring a threefold increase in processing rime. Most image coding standards employ de-correlated components, such as YlQ or Y, C-B, C-R, and subsampling of the 'chroma' components, such coding technique is employed here. Results of the coding, including reconstructed images and coding performance, will be presented.
Two tabular and two graphical techniques for the presentation of laboratory test results were compared in a reaction-time experiment with 22 volunteers. The experimental setup was designed to determine whether one or ...
详细信息
Two tabular and two graphical techniques for the presentation of laboratory test results were compared in a reaction-time experiment with 22 volunteers. The experimental setup was designed to determine whether one or more of the presentation techniques facilitated the recognition of four predefined combinations of abnormal test results, Using a conventional, tabular presentation technique as a reference, faster median response times were obtained with each of the other three presentation techniques, irrespective of pattern. The effect on accuracy was less clear, possibly due to the small number of errors made.
A color liquid crystal display (LCD) panel typically used in consumer product is composed of R, G, and B subpixels. Due to the subpixel structure and color microfilters, single LCD panel system (SLPS) using such type ...
详细信息
A color liquid crystal display (LCD) panel typically used in consumer product is composed of R, G, and B subpixels. Due to the subpixel structure and color microfilters, single LCD panel system (SLPS) using such type panel has low resolution, low brightness, and poor appearance of individual color pixel elements. These problems are solved by having three LCD panel system (TLPS) which is composed of three black/white (B/W) LCD panels. However, this system requires high cost and high hardware (H/W) complexity. In this paper, we propose a new LCD system using B/W and color LCD panels called hybrid LCD panel system (HLPS) to overcome the drawbacks of other types of LCD panel applications. Also, the associated color coding algorithm for maximizing the effect of the proposed system is developed. In spite of using the simplified H/W structure, little visual difference has been attained in comparison with TLPS in the view point of resolution and brightness. And the color fidelity is better than SLPS. Among the th ree types of the LCD projector, the light utilization efficiency of HLPS is the highest one turned out to be as 7.34%. Also, the HLPS is compact and relatively inexpensive.
Electrophysiologically, color-opponent retinal bipolar cells respond with opposite polarities tb stimulation with different wavelengths of light. The origin of these different polarities in the same bipolar cell has a...
详细信息
Electrophysiologically, color-opponent retinal bipolar cells respond with opposite polarities tb stimulation with different wavelengths of light. The origin of these different polarities in the same bipolar cell has always been a mystery. Here we show that an intracellularly recorded and HRP-injected, red-ON, blue/green-OFF bipolar cell of the turtle retina made invaginating (ribbon associated) synapses exclusively with L-cones. Non-invaginating synapses resembling wide-cleft basal junctions were made exclusively with M-cones. Input from S-cones was not seen. From these results we suggest sign-inverting transmission from L-cones at invaginating synapses via metabotropic glutamate receptors, and sign-conserving transmission from M-cones at wide-cleft basal junctions via ionotropic receptors. To explain the pronounced blue sensitivity of the bipolar cell. computer simulations were performed using a sign-conserving input from a yellow/blue chromaticity-type (H3) horizontal cell. The response properties of the red-ON, blue/green-OFF bipolar cell could be quantitatively reproduced by this means. The simulation also explained the asymmetry in L- and M-cone inputs to the bipolar cell as found in the ultrastructural analysis and assigned a putative role to H3 horizontal cells in color processing in the turtle retina.
A circular-viewing color-coding rainbow holography with a group of circular coding slits Is presented, in which the color coding holographic image can be observed around a 360 degrees viewing circle, and no particular...
详细信息
ISBN:
(纸本)0819422622
A circular-viewing color-coding rainbow holography with a group of circular coding slits Is presented, in which the color coding holographic image can be observed around a 360 degrees viewing circle, and no particular optical elements should be used.
Three color schemes (monochrome, dichrome, and polychrome) based on basic principles for color perception and cognition were optimized and applied to an electronic map in a horizontal-situation display. Principles for...
详细信息
ISBN:
(纸本)081942739X
Three color schemes (monochrome, dichrome, and polychrome) based on basic principles for color perception and cognition were optimized and applied to an electronic map in a horizontal-situation display. Principles for color discrimination, symbol coding, and color naming were applied for the super-imposed symbols (targets, waypoints etc) and for the map symbology (land, water, roads). The color codes were tested in a visual search and detection experiment in a real-time simulation in an air-to-air mission with test pilots as subjects. The simulation task was as close as possible to a real-life situation. The pilots had to track a maneuvering target within specified limits. Reaction times for target detection were recorded. After the simulation, the test pilots gave a subjective estimation of the different color schemes. They also estimated them according to situation awareness using a rating technique on cognitive compatibility (CC-SART). All the results, both the objective and the subjective show that color schemes are advantageous in comparison to the monochrome code. The reactions times were significantly lower for the chromatic color codes. The estimated situation awareness was higher for the chromatic schemes and the subjects gave higher preferences to the chromatic codes.
To determine whether real-time color coding enhances the detection of myocardial perfusion through the use of echocardiographic contrast agents, we used a recently developed real-time color system during contrast inje...
详细信息
To determine whether real-time color coding enhances the detection of myocardial perfusion through the use of echocardiographic contrast agents, we used a recently developed real-time color system during contrast injection in six open-chest dogs. Small amounts of echocardiographic contrast were injected into the left atrium. Short-axis epicardial images were obtained with a 5-MHz transducer before and after left anterior descending artery ligation. Gray-scale and rainbow-color map images were obtained for each contrast agent. The color map allowed detection of small increments in echo intensity that were not evident with routine gray-scale imaging. Thus, real-time color coding may improve the detection of myocardial perfusion with echocardiographic contrast agents. (C) 1994 John Wiley & Sons, Inc.
暂无评论