Image conversion

About: Image conversion is a research topic. Over the lifetime, 2490 publications have been published within this topic receiving 19077 citations.

Image conversion device, image conversion method, and image projection device

Abstract: There is provided an image processing device capable of reducing the load for processing of interpolation calculation performed when correcting the keystone distortion of an image. The image processing device includes: interpolation means (11, 12) for receiving original image data and executing several times a first interpolation calculation for a plurality of original pixel data arranged in the vertical or horizontal direction in the original image and a second interpolation calculation in the other direction, thereby generating new image data; and storage means (13) for storing the interpolation data (Va to Vd) obtained by the first interpolation calculation. When a combination of a plurality of original pixel data is the same as the combination used when calculating the interpolation data (Va’ to Vd’) already stored in the storage means (13), the interpolation means (12) reads out the interpolation data from the storage means (13) for use in the second interpolation calculation.

Color image processor

Abstract: PROBLEM TO BE SOLVED: To keep high image conversion accuracy without considerably increasing required memories by newly setting lattice points only to a range, where much higher accuracy is required or characteristics are changed by degradation with the passage of time, so as to improve accuracy within the range SOLUTION: A color corrector 12 stores the relation between the image data of source image and the image data of copy image at the respective lattice points of three-dimensional lattice composed of plural solids dividing a color converting signal space as a look-up table and determines a color correct signal CMY by performing three-dimensional interpolation A selector 14 judges whether or not the number of lattices is to be increased corresponding to the change of γ characteristics at an input device 11 and when that number is changed because of any change with the passage of time, the number of lattices is increased by setting the new lattice point at the center of changed range and outputted to the color corrector 12 Thus, color conversion accuracy can be improved in the range where the γ characteristics are rapidly changed COPYRIGHT: (C)1998,JPO

Medical Image Conversion with DICOM

Abstract: As the standard especially for the storage and transmission of medical images, the standard of Digital Imaging and Communications in Medicine (DICOM) is popular to the people of the world. And as a result, almost all the outputs of the computerized tomography (CT), magnetic resonance (MR), digital subtraction angiography (DSA) and ultrasonography (US) are saved as DICOM format. However, the DICOM format files can be opened by the original programs of windows OS, which is not convenient with the further research in image processing. The paper mainly does some research in the conversion from DICOM format files into general image/ media files. The procedure is to convert DICOM format files into bitmaps and then convert the bitmaps into other general image/ media files. The images then can be viewed directly by the original programs of Windows OS, which will facilitate the further researches on image process. The DICOM format files can be displayed while being converted; the images displayed can also be done with some further operations, such as the process of lightness and contrast gradient of image, image filtering and segmentation.

Advanced SVG triangulation/polygonalization of digital images

Abstract: The SVG (Scalable Vector Graphics) standard permits to represent complex graphical scenes by a collection of vectorial-based primitives. In this work we are interested in finding some heuristic techniques to cover the gap between the graphical vectorial world and the raster real world typical of digital photography. SVG format could find useful application in the world of mobile imaging devices, where typical camera capabilities should match with limited color/size resolutions displays. Two different techniques have been applied: Data Dependent Triangulation (DDT) and Wavelet Based Triangulation (WBT). The DDT replaces the input image with a set of triangles according to a specific cost function. The overall perceptual error is then minimized choosing a suitable triangulation. The WBT uses the wavelet multilevel transformation to extract the details from the input image. A triangulation is achieved at the lowest level, introducing large triangles; then the process is iteratively refined, according to the wavelet transformation. That means increasing the quantity of small triangles into the texturized areas and fixing the amount of large triangles into the smooth areas. Both DDT and WBT are then processed by the polygonalization. The purpose of this function is to merge triangles together reducing the amount of redundancies present into the SVG files. The proposed technique has been compared with other raster to vector methods showing good performances. Experiments can be found in the SVG UniCT Group page http://svg.dmi.unict.it/.

Apparatus and method for moving image conversion, apparatus and method for moving image transmission, and programs therefor

Abstract: A continuous frame-by-frame image display as a reduced-color moving image can be carried out in high quality on a high-resolution display device of a mobile terminal or the like. A request reception unit receives a moving image transfer request from the terminal, and a model judgment unit judges the model of the terminal. A moving image format conversion unit converts moving image data into a format corresponding to the model. If the terminal cannot carry out moving image display but can display a multimedia image wherein frames are continuously displayed one by one in high quality, a moving image conversion unit converts the moving image data into multimedia image data. At this time, a data size limit and the like of the terminal are considered. An image transmission unit sends the multimedia image data to the terminal.