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前言: 计算机用的图象信息输入输出装置已有很多试制实例,但一般价格很昂贵。在图象信息输入时,要想在短时间里输入高分辨率的图象,必须要用超高速A-D变换器。可是用廉价的低速A-D变换器时,为了提高图象分辨率,需要每隔几个象素就采样一次。如果用程序控制方式进行输入,就必须考虑程序的执行时间与图象信号传送之间的关系。对于微计算机的输入时间至少需要几秒钟以上,因此这样做是不合适的。如果再包括图象显示功能,那么要获得高分辨率图象,大多需要采用大容量的缓冲存贮器。进行上述几点改进后,便试制出微计算机图象信息输入输出装置,这种装置是采用直接
Preface: Computer image input and output devices have many trial production examples, but the general price is very expensive. To input a high-resolution image in a short period of time at the time of image information input, an ultra-high speed A-D converter must be used. However, with inexpensive low-speed A-D converters, in order to improve image resolution, it is necessary to sample every few pixels. If program control is used for inputting, it is necessary to consider the relationship between the execution time of the program and the transmission of image signals. It takes at least a few seconds for the input time of the microcomputer, so this is not suitable. If we include the image display function, then to obtain high-resolution images, most need to use large-capacity buffer memory. After the above improvements, they try out the micro-computer image information input and output devices, this device is a direct