Showing papers on "Channel (digital image) published in 1988"

System and method for determining orientation of planes of imaging

Abstract: An apparatus for use in determining the orientation and location of an image plane, particularly when imaging the head of a human being, has an elongated flexible channel provided for containing an imaging-opaque fluid which is visible in the image. First and second carriers are each provided for supporting three respective portions of the elongated flexible channel at respective orientations transverse to the image plane and in predetermined space relation with respect to one another. Preferably, the portions of the said elongated flexible channel are arranged substantially as legs of a triangle. A support arrangement maintains the first and second carriers in fixed spatial relation to one another and to the head of the human being. The present invention can be used in any of several known imaging modalities by using appropriate contrast agents. After imaging, the portions of the said elongated flexible channel appear as points in the image, the location of the plane of imaging, and its orientation, being determined by analysis of the distance between such points, and the ratios of the distances between them. Such analysis can be performed by computer. Additionally, with the use of the present invention, computer analysis can be used to reconstruct a given set of consecutive image planes, such as from MRI, to match another given set of image planes, such as from PET.

Field sequential color liquid crystal display and method

Abstract: There is disclosed a system, display, and method for providing a full color image from a plurality of primary colors. A liquid crystal display including a plurality of pixels arranged in rows is addressed by addressing means for addressing the rows of pixels continuously and sequentially. Data input means applies operating potentials to selected ones of the pixels as the pixels are addressed to cause the display to provide continuously progressing sequential image fields with each one of the image fields corresponding to a respective one of the primary colors. A light projecting means projects light fields of the primary colors onto the liquid crystal display in sequence with and in substantially following progression with the image fields.

Data processing system with common channel for image and character data

Abstract: A data processing system, in which image data is transmitted in units of predetermined length, e.g., a predetermined number of lines, and code data comprising a character or the like, is transmitted in units each of which contains the code data corresponding to the predetermined unit of the image data. The image and the code data are preferably transmitted on a common transmission channel, and can be separated upon reception for separate processing.

Display processor for image data with non-constant pixel size for chromatic values

Abstract: The invention is embodied in a system comprising image memory and a display processor that automatically processes video data which alternate between having chrominance pixels of greater area than luminance pixels and having chrominance pixels of the same area as luminance pixels. Subsamples describing chrominance pixels of greater size are time-division-multiplexed with samples describing pixels in the image memory output when the former type of processing is done. Whichever format for video data is currently being used, the channel for reading subsamples from image memory to the display processor is used to transmit flag data controlling the mode of processing of video data performed by the video processor.

Evaluation of motion estimation procedure for low-frame-rate aerial images

Abstract: In an attempt to improve the quality of displacement estimations between frames in low-frame-rate aerial sequences, a displacement estimation algorithm related to frame-differencing techniques combined with an affine model of motion was tested. The algorithm follows the development of Lenz (1984) in which points on displaced gray-level edges are used to estimate the local apparent horizontal and vertical displacements with the subsequent global motion parameters for translation, rotation, and zoom calculated through linear regression. Performance measurements were made with real video sequences. Effects of scene content and flight parameters were observed along with effects of frame transmission rate, image coding procedures, and channel errors for simulated transmission. The algorithm worked well, producing correct matches about 90% of the time, and was largely unaffected by image coding procedures or channel errors. >

A realtime 2D-velocity measuring method by image analysis of two pictures of suspending particles

Abstract: A new algorithm has been developed which enables automatic 2D-velocity measurement within a very short time. The algorithm consists of a high speed calculation of cross-correlation between two pictures, and new methods of removing erroneous vectors.The method is examined to measure a rotation of a turn table, a natural convection in a tank and a sudden expansion flow in a channel. The typical analysis time which depends on analysis conditions and pictures, is 2-4 seconds to obtain 100 vectors from a couple of 200×240 bi-levelyzed pictures.The programs coded in C runs on a simple 16bit peraonal computer system with a image capture board.

Effective patch discriminating method in automatic density controller

Abstract: PURPOSE:To prevent an erroneous control, by a method wherein, a predetermind calculation is conducted on the basis of the density of a color patch measured by every color, and the calculated value is compared with prestored data for judging whether the color patch is an effective one. CONSTITUTION:In a scanning densitometer, with the rotation of a motor 1, a measuring head 4 held by a guide 5 is traveled right and left and a pulse signal is issued from a rotary encoder 6 according to the travel distance of the measuring head 4. A color bar 9 is printed on a margin part of a printing paper 8 and composed of a large number of color patches 9a, and a host computer part stores the data for the respective patches by evey channel, i.e. Red, Green, and Blue. Therefore, whether the previously stored data per channel coincide with characteristics is discriminated. If it is not coincident, the data is made invalid because of the judgment that a patch absent part has been measured, and a protect is applied to a corresponding ink key. In this manner, the presence of an effective patch can be automatically discriminated, and an erroneous control to an ink key corresponding to an invalid patch can be prevented.