Showing papers on "Three-CCD camera published in 1993"

Videoconference system using a virtual camera image

Abstract: A teleconferencing video system uses two cameras at each station symmetrically positioned on opposite sides of the optical axis between the speaker and the monitor used to produce an image of the listener. The two cameras are used to provide from the two images observed by the cameras a virtual image corresponding to the image that would be viewed by a camera located on the first-mentioned optical axis. This system permits eye contact to be maintained between a speaker and a listener at different stations whereby the feeling of intimacy is enhanced.

Fast switching color filters for frame-sequential video using ferroelectric liquid crystal color-selective filters

Abstract: A frame-sequential color video system and color-selective filters for use in the same The color-selective filters of the invention have fast response, and can be switched between the three primary colors of red, green, and blue Switching between the three primary colors is achieved by selective absorption, or by selective interference, which is controlled by the switching of specific device combinations A frame-sequential color display system is achieved by combining such a color-selective filter with a fast-switching black and white video display, which can be either emissive or reflective A frame-sequential color camera system is achieved by combining such a color-selective filter with a fast-responding black and white video camera

Active calibration: alternative strategy and analysis

Abstract: Almost all camera calibration techniques use a known calibrating pattern and a static camera. Techniques based on an active camera, which does not need any predefined patterns, are introduced. All that is required is a scene with some strong and stable edges. Two algorithms are presented and analyzed. It is shown that one strategy performs much better in the presence of noise, and thus is preferable in practical situations. Experimental results are shown, demonstrating the validity of the algorithms. >

Aerial photography system

Abstract: A camera system for taking aerial, still photographs The system includes a video camera mounted proximate the distal end of a telescoping mast assembly The mast assembly can be extended, when oriented in a generally-vertical orientation, to effect elevation of the video camera The video camera mounts a still camera such that lens axes of the video camera and still camera can be made to converge at a desired subject when the video camera has been elevated to a desired height The system includes controllers for remotely operating motors to effect pan and tilt of the video camera, and to remotely control operation of the still camera

Suitability of the Pulnix TM6CN CCD camera for photogrammetric measurement

Abstract: The Pulnix TM6CN CCD camera appears to be a suitable choice for many close range photogrammetric applications where the cost of the final system is a factor. The reasons for this are: its small size, low power consumption, pixel clock output, variable electronic shutter, and relatively high resolution. However, to have any confidence in such a camera a thorough examination is required to assess its characteristics. In this paper an investigation of three of these cameras is described, and their suitability for close range photogrammetry evaluated. The main factors assessed are system component influences, warm-up effects, line jitter, principal point location and lens calibration. The influence of the frame-store on the use of the camera is also estimated and where possible excluded. Results of using these cameras for close range measurement are given and analyzed. While many users will have or prefer to buy other cameras, the evaluation of this particular camera should give an understanding of the important features of such image sensors, their use in photogrammetric measuring systems and the processes of evaluating their physical properties.© (1993) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Three-dimensional image pickup system

Abstract: PURPOSE: To provide a 3-dimensional image pickup system in which excellent operability is obtained, accurate depth information is reproduced and a 3-dimensional image is picked up while confirming a reproduced stereoscopic image at all times. CONSTITUTION: This system is provided with video cameras 1, 2 outputting an image signal corresponding to a picked-up object, rotary bases 18, 19 connected to the video cameras 1, 2 to vary the cross angle of the video cameras 1, 2, an image signal processing section 21 connected to the video cameras 1, 2 and converting the image signal outputted from the video cameras 1, 2 by a specified method to move a frame of the picture signal in the horizontal direction in response to the cross angle of the video cameras 1, 2, a stereoscopic display device 6 connected to the image signal processing the image signal processed by the image signal processing section 21, and a controller 20 connected to the image signal processing section 21 to control a moving amount of a frame. COPYRIGHT: (C)1994,JPO

Metric accuracy performance of solid state camera systems

Abstract: Readily available solid-state cameras range from inexpensive camcorders to specialized systems with cooled 'high-resolution' sensors. Prices of such systems are between $DOL500.- to $DOL100,000.-. The choice of an appropriate imaging system, both in price and performance, is thus of interest to system developers and users. Although the radiometric and geometric characteristics of these systems vary drastically, the degree to which these differences affect the accuracy of three-dimensional measurements has not been investigated in detail. This paper compares the three-dimensional accuracy of some representative solid-state cameras (S-VHS camcorder, off-the-shelf CCD-cameras, 'high- resolution' camera) via a testfield with highly accurate reference coordinates. The performance of the different systems is analyzed with respect to potential limiting factors and improvements which could enhance the accuracy. Accuracies exceeding 1/20th, 1/85th, and 1/15th of the pixel spacing were attained with a S-VHS camcorder, an off-the-shelf CCD-camera, and a 'high-resolution' camera with 3072 X 2320 pixels. The high level of performance is also evidenced by the relative accuracies in object space of 1:15000, 1:50000, and 1:35000 for the respective cameras.© (1993) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Optical system for obtaining separate and simultaneous near-infrared and visible light images

Abstract: A camera system for simultaneously recording separate near-infrared and visible light images is disclosed having a visible light source for illuminating a given area with visible white light, indicia generating means for directing an image of a wavelength of light longer than wavelengths of light of the visible white light upon the given area, a first electronic camera for recording an image of the visible light but not the longer wavelength of light and a second electronic camera for recording an image of the longer wavelength of light but not the visible light, and a single cold mirror common to the two cameras for directing the two light images to their respective cameras.

Apparatus and method for radiation imaging

Abstract: An X-ray imaging apparatus is constructed with a combination of an X-ray image intensifier, a relay optical system, and a video camera with avalanche multiplication camera tube. The video camera is controlled by an image acquisition circuit, a synchronizing signal generation circuit, and an applying voltage control circuit. The applying voltage control circuit for controlling the voltage to be applied to the video camera with avalanche multiplication camera tube controls the applying voltage on the basis of image data in an image memory so that the gray scale level of a detected visible image is corrected.

Optische klassifikation von pflanzen

Abstract: For the automatic optical quality control and/or classification of plants, an electronic colour camera takes a picture of a plant from above and an electronic half-tone camera takes a picture of the plant from the side. The electric image signals provided by each camera are digitised and evaluated by an image computer to determine characteristics of the plant. The height of the plant, in particular, can be found via the half-tone camera. Each camera has a light source. In order to prevent the mutual impairment of the images and their evaluation, each camera is preferably so constructed that it is insensitive to the light from the light source allocated to the other one. Mutual impairment can also be avoided by causing a control circuit to switch the two light sources on alternately and trigger the pictures taken of the plant by each camera at a time at which only the light source allocated to the camera is switched on.

High resolution camera system - has camera with image gatherers in image field of stationary or movable camera objective lens

Abstract: The system includes a camera with one or more image taking devices, arranged in the image field of a fixed or movable camera objective lens. A coarse shift of the image taking device(s) may be combined with a fine shift, using micro-scanning and/or several rotary motions. Pref. in a first coarse position the micro-scanning is carried out initially, followed by repeated scanning. The coarse positions thus differ by integral multiples, or by fractions of the geometric dimensions of the image taking device active surface. USE/ADVANTAGE - For video cameras with CCD array. Rapid, multiple image resolution.

Camera control for a videophone

Abstract: This camera control has a housing which rotatably accommodates a video camera (10'). It is provided that the camera control exhibits an image comparing unit (14) which derives a correction signal (K) from a comparison of the image currently picked up by the video camera (10') with a reference image stored in a frame buffer (13), that the correction signal is supplied to a camera adjusting unit (15) of the camera control, which derives from the correction signal (K) an adjusting signal (S1-S4) controlling a tracking movement of the video camera (10'), and that the camera control exhibits a positioning device (16) controlled by the adjusting signal (S1-S4) which executes the tracking movement of the video camera (10').

A 0.8 mu m CMOS digital signal processor for a video camera

Abstract: A digital signal processor has been developed for a video camera by using a 0.8- mu m CMOS process. This LSI includes almost all the functions of a video camera. It also integrates a circuit for extending the dynamic range and a three-line color processing circuit to realize true-to-life color reproduction. Using this LSI, a compact and lightweight video camera with high picture quality has been realized. >

Controller for picture input camera

Abstract: PURPOSE:To provide the controller for the picture input camera such as a video camera in which a desired video image is displayed on a monitor simply and quickly through remote control. CONSTITUTION:When a transmission request of function information is sent from an interface controller 12 to plural video cameras 13, the video camera 13 sends function information (type information of rotary mechanism section of video camera 13, moving range information and size information of CCD or the like) to the interface controller 12 and the information is stored in a storage section 2. Then the storage information is read and the direction or the like of the video camera 13 is controlled via a CPU 9. Furthermore, a video signal outputted form the video camera 13 is subjected to a prescribed display processing in a picture synthesis circuit 10 and the processed signal is outputted to a monitor 11.

Electronic camera and camera apparatus using same

Abstract: A camera apparatus that enables multiple electronic cameras connected to a computer to be operated in a desired sequence, and an electronic camera for use by the apparatus.

High-speed precision slow-scan CCD cameras

Abstract: CCD cameras are used in more applications in more fields today than in the past. As the areas of application change, so do the camera requirements. One area that has received a lot of attention lately is the pixel readout speed. So called 'slow scan' CCD cameras are achieving pixel rates that approach those of RS-170 video. Faster readout rates require major modifications to the circuits that are common in slower CCD camera systems. In this paper, we discuss some of the design implications of higher frame rate CCD cameras and methods used to improve performance at these higher rates.

Test and analysis on variable-integration low-light-level CCD camera signal and noise properties

Abstract: Video signal-to-noise ratio (SNR) is an important combination performance index of the low light level (LLL) camera, test and analysis on it play a very important role in evaluating and designing new LLL cameras. It is an innovation in our teaching and research section that we test video SNR by using digital storage oscilloscope (DSO) combined with a computer and set up a perfect LLL camera signal and noise property test and analysis system. Using this system, we test and analyze the signal and noise properties of the `variable integration low light level CCD camera' which our teaching and research section developed.© (1993) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

High-resolution CCD camera for industrial imaging

Abstract: The KODAK MEGAPLUS Camera Model 1.4 was redesigned and features greatly improved performance capability. In particular, the CCD imager is operated in a mode (accumulation mode) that provides a dramatic reduction in dark current and dark current-related noise. The camera uses high-bandwidth low-noise electronics to produce the highest image quality possible. The camera's dual-blade electro-mechanical shutter eliminates non-uniform exposure effects and provides greatly improved reliability.© (1993) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

High-speed multiple channel TDI camera for document scanning applications

Abstract: A new camera using TDI (Time Delay and Integration) technology, capable of capturing high resolution images from continuously moving documents has been successfully demonstrated. The new camera operated at a high speed (120 ips) scanning mail for high quality OCR (optical character recognition). The camera achieves a high quality throughput by using eight parallel processing channels which are digitized to 256 levels (8 bits) within the camera at a total effective speed of 80 Mhz. Previous image pickup units have suffered from low contrast and low resolution at high speed. This new camera has the ability of producing gray scale information per pixel in a relatively low (80 times less power) light environment compared to similar line scan cameras. The camera output consists of 8 channels of video digitized simultaneously to provide a resolution of 2048 pixels per line, operating to a maximum line rate of 32 kHz. Experimental results demonstrate the ruggedness of TDI and its usefulness in a field environment. Results show that contrast ability did not significantly degrade despite velocity mismatch of 2.5% between the camera and the imaged document.

Adaptor used between microscope and video camera - has external screw thread for fixing to camera objective in place of standard filter

Abstract: The adaptor (12) allows a microscope to be attached to the objective of a video camera or camcorder and fits between the microscope tube head and the video camera and incorporates an auxiliary objective. The adaptor has an external screw thread (12.2) which matches the filter thread of the camera objective, the auxiliary objective comprising a biconcave lens (12.3). Pref. the height of the adaptor is selected so that the size and focus of the image obtd. via the camera is not affected, the auxiliary lens reducing the image enlargement required at the camera objective. ADVANTAGE - Provides good image quality using standard video camera or camcorder. Allows video recording and transmission of microscopic images by wider range of users.

X=ray video camera appts. for medical use - uses camera tube with grey-scale image intensification provided by avalanche multiplication

Abstract: The video camera system uses an X-ray image amplifier (3), as optical transmission system (2) and a video camera (1) with a camera tube which exhibits an intensification function for signals which represent the grey scale values for a visible image. Pref., the camera tube has a photoelectric conversion layer for converting the incident light into a corresponding electrical charge and for providing avalanche multiplication of the charge. The avalanche multiplication factor can be varied by controlling the target voltage of the camera tube. ADVANTAGE - Provides high quality visible image of examined object, with near-uniform grey-scale level for background.