Abstract: A line structure correction circuit for reducing the visibility of the raster line structure of a television picture which is to be photographed. The picture information associated with each raster line in the television picture signal is repeated n-times, n being an integer at least equal to two. The raster-line information is applied to a television display device operated at the same line period as the picture signal but with an n-times longer picture or frame period, respectively, depending on whether the television picture is interlaced. A further improvement in the quality of the recording is obtained by forming the information in each raster line of the television picture from different combinations of the information associated with consecutive raster lines in the picture signal.

Abstract: In an X-ray image intensifier-television pickup tube apparatus for displaying an image with a small contrast difference, the beam current of the television camera tube can be temporarily increased. As a result, images can be displayed with an increased signal-to-noise ratio. The television camera can then be switched, preferably automatically between this form of image production and the usual production of fluoroscopic images.

Abstract: The method and the device in accordance with the present invention utilizes a recursive filter for forming a composite image from a short series of X-ray images with the weighting factor .alpha. used in the filter being a function of the number of X-ray images processed and to be processed. When .alpha. is suitably chosen, the amplitude of the composite image is always constant, such as a constant image brightness, and each X-ray image makes an equally large contribution to the composite image. The noise level in the composite image decreases as the number of processed X-ray images is larger.

Abstract: The invention relates to a method of and a device for generating differential images in which the effect of fluctuations of the X-ray pulse or the gain of the images intensifier/image pick-up tube network on the differential image is eliminated. To this end, the peak value is determined for each X-ray image in order to be stored in a fixed location in a memory. The difference between the logarithms of the peak values is added to the differential image, so that said fluctuations are compensated for.

Abstract: A device for and method of X-ray processing in which a constant adjustable signal value is subtracted from a video signal of an X-ray image in order to correct the video signal for the effects of inherent scatter. The adjustable signal value depends on the X-ray tube voltage, the nature of the object to be examined, the field size etc. so that it is preferably dependent on the X-ray exposure parameters. The video signal is preferably converted into a logarithmic value by means of a logarithmic table which is dependent on the adjustable signal value (or actually on the exposure parameters).

Abstract: Two image processing devices having different time delays are used to generate time difference images having high signal-to-noise ratios. The image processing devices may be real time image processors having only one image memory wherein consecutive images are sequentially fed in digital form to a recursive filter. In such devices the memory is employed in the recursive filter as a "delay element", as a result of which noise integration and differential image determination between consecutive images takes place.

Abstract: A real-time image processing device having only one image memory. Consecutive images are sequentially fed in digital form to a recursive filter. The memory is employed in the recursive filter as a "delay element", as result of which noise integration and differential image determination between consecutive images take place.