This paper describes stereo method with eye movement to extract 3-dimensional reatures of the object. Two cameras are able to rotate freely and adjust an aimed feature point to the center of the camera images using a matching method based on edge lines. The 3-dimensional position can be easily calculated for the small region of the aimed feature. The cameras continue to search the features around this point and extract 3-dimensional positions for the object. Simulation results confirm this approach to be effective.
As one of the methods of estimating 3-dimensional positions from several images, binocular stereograph has been studied. However, the detection of corresponding feature points between two images is very hard. In this paper, we propose a matching method based on geometric structures of edgelines of each image. For the relationships of parallelism and connection among neighboring edgelines on one image are similar to those on the other image, the corresponding regions can be found by comparing with structures of edge1ines. Using these pairs of corresponding regions, the 3-dimensional positions of objects are estimated in the scene.
A new automatic measuring system is developed for measuring and drawing three dimensional objects by using ITV camera and a micro-computer. The measuring precision is within 0.4%, and it is found to be enough for measuring human bodies. This method was applied to the apparel making for gentlemen's suits with on-line, real time measuring data from living human bodies.
A new image distortion correcting method for a hand-held image reader, using correlation is proposed. Hand scanning speed is measured by the time difference between the two parallel line image sensors when detecting the same point found using sensor input image correlation. Vertical movement is also detected by this correlation. Output images are corrected by converting line density and the vertical shift of images. The experimental result confirms this correction method.
This report describes the conversion of structured documents into analog facsimile signals : its consturction and the process. Constructed documents are treated as mixed mode documents in recommendation T.73. The concept of this recommendation are applied to G3 facsimiles, and the function of mixed mode operation is extended to geometric graphics. These techniques assures efficient storage and transportation of documents for computer-and-facsimile system, and various services which use facsimiles are provided by the system.
We have developed the low-power, compact, light-weight and highreliability image sensor. The power consumption of the sensor has been greatly reduced by using the optical scanning method in which a light spot sequentially illuminates each tiny area on a document insted of illuminating the whole area of read width on the document at a time. To make it compact and light-weight, the LED array and the amorphous silicon photodetector are put into the same length as the read width and into the proximity type. This results in the dimension of 90(W)×50(D)×23(H)mm.
This paper describes design considerations by computer simulation and trial fabrication results of a new lensless area image sensor with 64×64 elements. The imager is placed in direct contact with a document and detects the light reflected from the document. Experimental results show good picture quality and indicate the possibility for apprication in handheld image readers and OCR scanners.
Photon noise characteristics in high sensitive image devices were studied by disital x-ray photon counting.The value of photon noise which distributed in Poisson'stype followed square root of average photon number. A miscount decreased the expected shot noise. Unified theory of noise current which included amplification type in image sensor was proposed by estimating above mentioned phenomena. Moreover, high sensitive structures in HDTV device were derived from the theory above mentioned.
In order to clarify the thermal emission characteristics in diode type electron-guns characterized by simple electrode configuration composed at a flat cathode and a flat anode applied a positive potential against the cathode, abnormal emission from the cathode edge, namely cathode edge emission was examined both theoretically through Zhaos' approximate analysis and experimentally by measuring test guns. The results obtained are as follows, (1) the theoretical estimation well agrees with the measurements, (2) the effect of edge emission should be taken into account in practically used diode guns e.g. for camera tubes, especially when they are operated on a lower anode potential.
This paper presents the design of a Ultra High Speed Framing Camera using the proximity focused image intensifier. While usualy used to intensify two-dimentional image, this device has a capability of fast gating of image by supplying electrical pulse to photocathode. By utilizing an additional external transparent electrode, gating time of l nanosecond is available. The fundamental experimemt of partial operation of image intensifier by using divided electrodes is accomplished, so the experimental method and some results are designated.
An a-Si photoreceptor with a surface protective layer of a-SiC and a bottom absorption layer of a-SiAl has been developed for a diode laser printer application. The gas system of SiH_4-C_2H_2 is used to deposit a-SiC and achieves a deposition rate of 10〜20μm/h higher than that from SiH_4-CH_4 by a factor of 〜20. The layer of a-SiAl synthesized from SiH_4 and (CH_3)_3Al contributes to a reduction of interference fringes appearing in an image printed by the laser printer with a normal a-Si photoreceptor.