KEYWORDS: Cones, Color vision, Visual process modeling, Color difference, RGB color model, Image segmentation, Retina, Image processing, Color image processing, Electronic imaging
In this paper, we propose a color conversion method for realizing barrier free systems for color-defective vision.
Human beings are perceiving colors by a ratio of reaction values by three kinds of cones on the retina. The three
cones have different sensitivity to a wavelength of light. Nevertheless, dichromats, who are lacking of one of the three cones, tends to be diffcult for discriminating colors of a certain combination. The proposed techniques make new images by converting color for creating perceptible combination of color. The proposed method has three parts of processes. Firstly, we do image segmentation based on the color space L*a*b*. Secondly, we judge whether mean colors of divided regions of the segmented image tend to be confusion or not by using confusion color loci and color vision models of the persons with color-defective vision. Finally, the proposed technique realizes the perceptible images for dichromats by changing the confusion color in several regions of images. We show how effectiveness of the method by some application results.
With the advent of ISDN / OSI products conforming to international standards, interconnectivity or interoperability has been attracting users’ attention over the world. By means of interconnectivity testing, domestic or international, interconnectivity of H. 320 terminals through commercial ISDN networks is getting more and more reliable.
Currently, ratio of successful calls is about 90% according to measurements made by HATS Conference (Japan). This means one out of ten (10) calls will be incomplete on the average. To make users very comfortable with H. 320 terminals, higher ratio is expected and it is well within our reach according to the author’s experience.
In order to realize higher reliability and better utility of H.320 terminals, international cooperation throughout the world is strongly desired.
This paper proposes a DPCM algorithm to be deployed for broadcast quality transmission of composite NTSC color TV signal at DS-3 rate (45 Mb/s). Recently, many algorithms have been proposed for TV coding and most of them are based on orthogonal transform such as DCT. DCT is appropriate for high compression. On the other hand, DPCM is the best candidate for highest quality transmission, though it might need a comparatively high transmission rate. DPCM can be directly applied to composite NTSC signal without separation/synthesis of chrominance and luminance components before/after the compression. In case of cascaded connection, no accumulation of coding noise can be achieved unlike transform coding. It has been confirmed, using a complete codec running at DS-3 rate, that the proposed adaptive DPCM is very effective even for composite NTSC signals including the CCIR standard sequences. This adaptive DPCM contributes to rapid progress of a digital broadcast TV transmission network using a high speed medium such as SONET as well as DS- 3 service.
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