Showing papers on "Image conversion published in 1985"

Image conversion equipment for setting a photographic exposure device and method for setting a photographic exposure device

Abstract: The invention relates to image conversion equipment for setting a photographic exposure device, in particular with respect to colour composition of light emitted by the exposure device, sharpness, image produced, stop value and exposure time. Furthermore, the present invention relates to a method for setting a photographic exposure device with the aid of such image conversion equipment. Previous equipment for setting a photographic exposure device is subject to error in operation and technically complicated. In order to improve the image quality of the finished print, the image conversion equipment according to the invention has an optical system and an electronic image conversion unit, which are arranged relative to a datum plane of the image conversion equipment in such a way that a projection in the datum plane is converted into a projection into an image plane of the image conversion equipment. The image conversion equipment permits an entirely novel method of setting for a photographic exposure device.

Photographing device using radiant ray

Abstract: PURPOSE:To simplify the constitution of the titled device and to display a radiation image by simple handling by optically scanning only a radiation-photographed area on a radiation image conversion panel in a radiant ray irradiating area having optional size CONSTITUTION:An X-ray image conversion panel 52 is charged to a panel holder 34 Subsequently, servo motors 39, 44 controlled by a control device 23 are driven to position the panel holder 34 on a photographing area Then, X-rays are irradiated from an X-ray tube 28 to a subject 26 and the X-rays transmitted through the subject 26 is absorbed into an accelerated phosphor on an X-ray image conversion panel 52 The photographed X-ray image conversion panel 52 is stored in a take-up magazine 33 and then transferred to a reader 21 and the reader 21 scans the surface of the X-ray image conversion panel 52 optically with laser beams projected from a laser tube 53 on the basis of the rotation of a reflector 54 and the driving of a carrier belt 51 Accelerated light generated by the irradiation of the laser beams is condensed by a condenser part 56, photoelectric converter 57 and then outputted as the data of the X-ray image

Reading method for radiation image

Abstract: PURPOSE: To make image information available efficiently and easily by setting up a read out region when reading radiation image information through the radiation image conversion panel. CONSTITUTION: The number of the picture element to be read at the top in the main scanning direction and the top line number to be read at the top in the sub-scanning direction, lengths in respective directions and picture element density are set in the region designation section 10 based on data input through a keyboard or other means of the region parameter input section 11. Designation of read out section is made based on the counting, as for the sub-scanning direction, of the main scanning synchronization signals with respect to the sub-scanning synchronization signals and, as for the main scanning direction, of picture element clock signals that are outputted for each picture element with respect to the main scanning signals. Needless to say, to shorten the time taken until the read out region is reached, the sub-scanning speed is taken into account when the top line number in the sub-scanning directino is set in the region designation section 10, saving time to read data in unnecessary read out region. Thus, much better use is made of the memory. COPYRIGHT: (C)1986,JPO&Japio

Opto-electronic Bistable Devices for Image Processing

Abstract: Several opto-electronic bistable devices with twisted nematic liquid crystals are designed and used for image processing. The optical bistability characteristics of liquid crystals are used for two types of light valve, those with array structure and parallel operation and those with single cell with sequential operation. Experimental studies demonstrate the application of these opto-electronic bistable devices in important operations currently used in image processors, such as intensity limiting for contrast improvement and noise elimination, contour accentuation for pattern recognition, linear and nonlinear optical filtering (in spatial and spectral domains), incoherent-to-coherent image conversion and logic operations.

Picture data processing method

Abstract: PURPOSE:To attain a picture data processing method which can be outputted just with a single scan of a plotter without increasing the arithmetic processing time nor the output time and with high image resolution secured over the entire surface, by developing the picture data which underwent the image conversion with different levels of dot density to a development memory securing its own area to produce the image data. CONSTITUTION:The article data undergoes the image conversion through a character generator 5' having the dot density equivalent to 454 dots/inch in terms of a conversion display of output screen and then is developed as it is to an area equivalent to a development memory 3 with coincidence secured with a start point address. While the photo/picture data undergoes the image conversion through a halftone point conversion part 6' with the dot density equivalent to 909 dots/inch and is developed as it is with coincidence secured with the start point address. When these data are read out for plotter output, the article data converted into an image is discriminated as an image data by a selection/enlargement part 7. Then this image data is selectively enlarged (double in this example) and given to a plotter.

Planetary image conversion task

Abstract: The Planetary Image Conversion Task group processed 12,500 magnetic tapes containing raw imaging data from JPL planetary missions and produced an image data base in consistent format on 1200 fully packed 6250-bpi tapes The output tapes will remain at JPL A copy of the entire tape set was delivered to US Geological Survey, Flagstaff, Ariz A secondary task converted computer datalogs, which had been stored in project specific MARK IV File Management System data types and structures, to flat-file, text format that is processable on any modern computer system The conversion processing took place at JPL's Image Processing Laboratory on an IBM 370-158 with existing software modified slightly to meet the needs of the conversion task More than 99% of the original digital image data was successfully recovered by the conversion task However, processing data tapes recorded before 1975 was destructive This discovery is of critical importance to facilities responsible for maintaining digital archives since normal periodic random sampling techniques would be unlikely to detect this phenomenon, and entire data sets could be wiped out in the act of generating seemingly positive sampling results Reccomended follow-on activities are also included

Image transducer system with planar semi-conductor sensor

Abstract: Because of their low resolution compared with tube cameras, planar semi-conductor sensors can only be used to a limited extent for the electrical image conversion in video cameras An increase in the resolution for the purpose of image conversion is achieved by means of a mechanical-optical arrangement Introducing a thin plane-parallel optical plate 1 into the beam path between objective 4 and image plane 3, a defined image offset is produced which amounts to integral fractions of the distance between the semi-conductor rows and columns, respectively, depending on the multiplication factor of the resolution The plane-parallel optical plate can be constructed as a circular disc having different segments It is driven synchronously to the frame read-out rate by means of a motor 2 For the line interlace method, a simple application is obtained without signal buffer storage

Reading system of radiographic image

Abstract: PURPOSE:To improve the power of separation between accelerated exciting light and accelerated fluorescence by using laser light as the accelerated exciting light and using the combination of two or more kinds of filter different in half- value width for the purpose of separating the accelerated exciting light and the accelerated fluorescence CONSTITUTION:An object 12 is arranged between a radiation generator 11 and a radiographic image conversion panel 13, and radiation is irradiated to the object 12 Electrons and/or positive holes stored in the trap level of an accelerated fluorescence layer of the radiographic image conversion panel 13 are excited by a laser light source 14 to radiate a stored image as the accelerated fluorescence This accelerated fluorescence is separated from the laser light by two or more kinds of filter 18 different in half-value width and is converted to an electric signal by a photodetector 15 The electric signal of the photodetector 15 is sent to an image reproducing device 16 and is displayed as a radiographic image on an image display device 17 Thus, the power of separation between the accelerated exciting light and the accelerated fluorescence is high sufficiently to obtain the practical radiographic image of less noise