专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US3983320A Raster display histogram equalization 失效
公开(公告)号：US3983320A
公开(公告)日：1976-09-28
申请号：US608319
申请日：1975-08-25
申请人： David J. Ketcham , Roger W. Lowe , Michael D. Pruznick , Eugene W. Opittek
发明人： David J. Ketcham , Roger W. Lowe , Michael D. Pruznick , Eugene W. Opittek
IPC分类号： G06T5/40 , H04N3/00
CPC分类号： G06T5/007
摘要： 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. In the continuous process the mini histograms are read out in parallel to form a plurality of histograms and multiple truncation maps which are stored in a selected number of RAM memories. Digital video is then processed through these transformed memories and stored in output buffers which may be required because of the multiplexing. In the system utilizing one dimensional processing, histograms are formed for the data of a selected number of lines in order to equalize the data of a selected line or lines and the histogram window area is moved vertically over the entire raster area.

2. 发明授权

US3996421A Television display utilizing local area brightness control 失效
标题翻译：电视显示利用局域亮度控制
公开(公告)号：US3996421A
公开(公告)日：1976-12-07
申请号：US609753
申请日：1975-09-02
申请人： Michael D. Pruznick , David J. Ketcham , Roger W. Lowe , Eugene W. Opittek
发明人： Michael D. Pruznick , David J. Ketcham , Roger W. Lowe , Eugene W. Opittek
IPC分类号： H04N5/20 , H04N5/14
CPC分类号： H04N5/20
摘要： 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. The window is slid one element at a time and a bias adjustment is made for each centrally located element until all of the elements in the first eight lines have been entered into the computation. The window is then deflected one line down and back to the first eight elements of the second through ninth display lines. The process of sliding the window to the right continues again until all the elements within this second set of sliding windows is completed. Thus, the window slides across the display one element at a time and down one line at a time at the end of each set of lines until all of the elements in the display have entered into the computation.
摘要翻译：公开了一种光栅显示系统，其利用“滑动窗口”效应来通过调整窗口内的视频增益和亮度来增强图像的对比度。电视显示器可以具有每行512行和512个元素的光栅。利用数字电路的显示系统计算具有每个显示行的预定数量的元素和若干并行显示行（例如每行8行和8个元素）的“窗口”的平均亮度。因此，提供了一个八乘八窗口。从中心位置的元素的亮度中减去窗口的平均亮度，导致元素的相对亮度。该相对亮度信号乘以增益因子，并将乘积施加到用于控制窗口的中心元件的偏置的输出电路。窗口被移动一个元素，并且进行第二计算，这进而导致为位于第二窗口内的第二元素设置新的偏置。窗口一次滑动一个元素，并对每个位于中心的元素进行偏置调整，直到前8行中的所有元素都已输入到计算中。然后将窗口向下和向后偏转到第二至第九显示行的前八个元件。将窗口向右滑动的过程将再次持续，直到第二组滑动窗口中的所有元素完成。因此，窗口每次在每组线的末端一次一个地滑过显示器一个元件并一次下降一行，直到显示器中的所有元素都进入计算。

3. 发明授权

US3979555A Histogram equalization system for display improvement 失效
标题翻译：直方图均衡系统，用于显示改进
公开(公告)号：US3979555A
公开(公告)日：1976-09-07
申请号：US582478
申请日：1975-05-27
申请人： Eugene W. Opittek , David J. Ketcham , Edward J. Dragavon
发明人： Eugene W. Opittek , David J. Ketcham , Edward J. Dragavon
IPC分类号： G01S7/06 , H04N5/20 , H04N3/00
CPC分类号： H04N5/20 , G01S7/06
摘要： 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.
摘要翻译：直方图均衡系统，其自适应地重新分配视频的强度编码，以便在所有显示强度级别提供相等数量的元素。例如，存储在积分器中的输入视频的实际振幅值被用来寻址最初加载全零的随机存取存储器。存储器被组织成使得存在与在积分器中携带的可能的视频强度值一样多的可寻址字，从而在存储器内建立直方图。在完成直方图时，等于直方图存储器被依次读取的比较器中用于等于与用于形成直方图的数据相对应的数据的数量除以希望截断的值的数量的常数出来并累积确定截断点。锁存电路充满截断点值，这些点用于响应于输入视频信号的截断逻辑电路，以减少视频位数。截断的信号增加了对场景的局部信号变化的敏感度，以便增加需要附加强度代码的灰度区域的细节。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式