Showing papers on "Image conversion published in 1984"
Patent•
22 Jun 1984TL;DR: An X-ray diagnostic apparatus for allowing stereoscopic visualization on Xray images of an object under examination includes at least a stereoscopic x-ray tube, a deflection coil type Xray image intensifier, and a single television camera as mentioned in this paper.
Abstract: An X-ray diagnostic apparatus for allowing stereoscopic visualization on X-ray images of an object under examination includes at least a stereoscopic X-ray tube, a deflection coil type X-ray image intensifier, and a single television camera. The right-viewed and left-viewed X-ray visual images are alternately output from the image intensifier with a given deviation between centers of those images. Those visual images are alternately incident upon the respective image conversion regions of the TV camera, whereby the electrical scanning is also done alternately for each of the image conversion regions so as to prevent the after-image effect.
31 citations
Patent•
16 Apr 1984
TL;DR: In this article, an apparatus for converting a negative image on a negative recording medium to a positive image includes a first converter for converting composite video signal into its luminance and color difference components.
Abstract: An apparatus for converting a negative image on a negative recording medium to a positive image includes a first converter for converting a composite video signal into its luminance and color difference components. A first processor electronically inverts the luminance signal while a second processor electronically inverts the luminance and color difference components together resulting in second luminance and second color difference signals. The second luminance and second color difference signals are encoded to produce a second video signal which is a positive image having corrected brightness and white balance.
13 citations
13 Aug 1984
TL;DR: This paper has demonstrated for the first time a processor which can be both programmed and addressed in real-time and which through the use of a low power HeNe laser, has enabled an appreciable reduction in the size and power requirements of such a system.
Abstract: This paper describes initial work on the design and application of a versatile optical image processor based on the combination of degenerate four wave mixing (DFWM) and an optically addressed spatial light modulator. This has demonstrated for the first time a processor which can be both programmed and addressed in real-time and which through the use of a low power HeNe laser, has enabled an appreciable reduction in the size and power requirements of such a system. The combination of SLM and DFWM technologies enables a number of processing operations to be implemented. The light valve can be used both as a means of implementing incoherent to coherent image conversion and for certain preprocessing operations such as contrast modification and image subtraction. Degenerate four wave mixing is an all-optical phenomenon whereby three input waves mix within a non-linear medium to generate a fourth wave. By spatially modulating two of the input waves, and including Fourier transforming elements, the output wave can, under certain conditions, represent the correlation product of the two inputs. The design specification for the processor and progress towards its practical implementation will be considered. An assessment of the performance of the system will be described and initial results for both phase conjugate imaging and pattern recognition (for simple test images) will be given.
2 citations