Eugene W E Opittek

39833208, Sep 28, 1976

Aug 25, 1975

5/608319

David J. Ketcham - Lakewood CA
Roger W. Lowe - Lakewood CA
Michael D. Pruznick - Huntington Beach CA
Eugene W. Opittek - Santa Ana CA

Hughes Aircraft Company - Culver City CA

H04N 300

178 68

Real time histogram equalization systems for a television type display that performs equalization with one or two dimensional processing on a local area or sliding window basis. For the two dimensional system, the intensity for any particular point in the image is adjusted according to a histogram of the area contained within a window immediately surrounding the point to be equalized. The histogram forming window provided by the system moves across the image in two dimensions both horizontally along each of a plurality of overlapping segments arranged parallel in the vertical dimension, and at each window position reassigned center picture elements are equalized. The processing of the histograms area or the sliding process is continued over the entire surface of the raster with the process being then repeated in a continuous fashion. The area being equalized for each window position may be selected equal horizontally and vertically to the respective amount of shifting along each segment between window positions and of the shifting of the window between adjacent segments. In order to process the histograms at the video rate and resolution the system computes mini or subhistograms from an area formed of a selected number of elements of the histogram in the horizontal dimension by the number of histogram lines in the vertical dimension of the window and sums the statistics of a selected number of the mini histograms to generate one histogram for equalizing the central area.

39964213, Dec 7, 1976

Sep 2, 1975

5/609753

Michael D. Pruznick - Huntington Beach CA
David J. Ketcham - Lakewood CA
Roger W. Lowe - Lakewood CA
Eugene W. Opittek - Santa Ana CA

Hughes Aircraft Company - Culver City CA

H04N 514
H04N 520

178 73D

A raster display system is disclosed which utilizes a "sliding window" effect for enhancing the contrast of an image by adjusting the video gain and brightness within the window. The television display may have a raster having 512 lines and 512 elements per line. The display system utilizing digital circuitry calculates the average brightness of a "window" having a predetermined number of elements per display line and several parallel display lines, such as, for example, eight lines and eight elements per line. Thus, an eight-by-eight window is presented. The average brightness of the window is subtracted from the brightness of a centrally located element which results in the relative brightness of the element. This relative brightness signal is multiplied by a gain factor and the product is applied to an output circuit for controlling the bias of a central element of the window. The window is moved one element over and a second computation is made which in turn results in a new bias being set for a second element centrally located within the second window.

40539466, Oct 11, 1977

Nov 24, 1975

5/634711

Eugene W. Opittek - Santa Ana CA
James L. Heard - Torrance CA
Bruce W. Keller - Scotland AR
Michael D. Pruznick - Huntington Beach CA
Thomas A. Bosseler - Westminster CA

Hughes Aircraft Company - Culver City CA

G06F 305

364200

A digital scan converter which comprises modular video processing units and modular memory and output units is adapted for processing applied sensor data of various formats so as to provide output data suitable for display on a common indicator. Parameters for processing operations, such as analog-to-digital converting, integrating and detecting, are implemented by the video processing modules in response to digital "set-up" and address words applied from a programmed microprocessor controller. The storage and readout format of the memory and output modules is also controlled by "set-up" and address words applied from the programmed controller.

39795551, Sep 7, 1976

May 27, 1975

5/582478

Eugene W. Opittek - Santa Ana CA
David J. Ketcham - Lakewood CA
Edward J. Dragavon - Los Angeles CA

Hughes Aircraft Company - Culver City CA

H04N 300

178 68

A histogram equalization system that adaptively redistributes the intensity coding of the video in order to provide an equal number of elements at all display intensity levels. The actual amplitude value of the input video as stored in an integrator, for example, is utilized to address a random access memory which originally is loaded with all zeros. The memory is organized such that there are as many addressable words as there are possible video intensity values carried in the integrator thereby building up a histogram within the memory. Upon completion of the histogram, a constant equal to the number of picture elements corresponding to the data used to form the histogram divided by the number of values to which it is desired to truncate, is utilized in a comparator as the histogram memory is sequentially read out and accumulated to determine the truncation points. A latching circuit is filled with the truncation point values and these points are used in a truncation logic circuit responding to the input video signal to reduce the number of video bits. The truncated signal increases the sensitivity to localized signal variations of a scene so as to increase the detail of the gray scale region requiring additional intensity codes.