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电视摄象机拍摄图象时用的是一系列水平线对图象迸行扫描,这样便使整幅图象的全部象素能够包括在一个电视信号中。按照CCIR标准,电视的每帧图象由两场构成,每场各为312.5行。每行长64μS,其中约4OμS用来传送图象信号。如何将摄象机与微机联接起来,P. How-ard曾提出过一种方法(译文见《电视技术》1985年第2期)。这类接口的一个主要问题就是摄象机的速度比微机快。Howard的方法是
A television camera uses a series of horizontal lines to scan an image. This allows all pixels of the entire image to be included in a television signal. According to the CCIR standard, each frame of television consists of two fields of 312.5 lines each. Each line length 64μS, of which about 4OμS used to send the image signal. How to connect a video camera with a microcomputer, P. How-ard has proposed a method (translated, “TV technology” 1985 the second period). One of the major problems with this type of interface is that the camera is faster than the computer. Howard’s approach is