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公开(公告)号:US4413287A
公开(公告)日:1983-11-01
申请号:US368258
申请日:1982-04-14
摘要: A white line skipping technique for data reduction is disclosed for reducing facsimile transmission time. Video processing for white line skipping centers around the use of a five element solid state linear array. The photosensitive area for each of the five elements corresponds to a single picture element for the defined resolution parameters. VID 0 is the active video signal and is processed in the normal manner for transmission. VID 1 through VID 4 comprise the look ahead scan elements. The slicing level is derived from the VID 0 peak detector which controls the video automatic gain control. Any black video elements encountered during a scan line causes a flip-flop to be set. At the end of each scan line, corresponding to one complete drum revolution, and during the lost time interval, the status of each flip-flop is sampled by the microprocessor to determine whether the scan line is entire white. The flip-flops are then reset for the next scan or drum revolution.
摘要翻译: 公开了用于减少传真传输时间的白线跳过技术。 用于白线跳过的视频处理围绕使用五元素固态线性阵列。 五个元件中的每一个的光敏区域对应于用于定义的分辨率参数的单个图像元素。 VID 0是有效的视频信号,并以正常方式进行处理以进行传输。 VID 1至VID 4包括前瞻扫描元件。 切片电平从控制视频自动增益控制的VID 0峰值检测器导出。 在扫描线期间遇到的任何黑色视频元件都会触发一个触发器。 在每个扫描线的末端,对应于一个完整的转鼓旋转,并且在丢失的时间间隔期间,每个触发器的状态由微处理器采样,以确定扫描线是否是整个白色。 然后复位触发器进行下一次扫描或转鼓旋转。