The novel term of “electronic image” means a picture prepared by imaging system based on electro-assisted processes of image detection, processing, recording and displaying. The photography print-like hardcopy prepared by TV (video) signal is a typical electronic image and a model of output picture for a new electronic photography system.
The fine imaging means a procedure to form picture showing excellent image qualities of high resolution and high definition. These characteristics are related to the problem of information capacity in the picture. The information capacity of picture is determined by product of pixel number and tone reproducing function. In hardcopy, the pixel number is the primary factor.
This 'paper describes the relation of pixel number and definition of output hardcopy. Generally in the analog signal processing, the pixel number of TV picture (frame) is determined by number of scanning lines and aspect ratio of picture. At present new TV standards of Clear-vision and HIVISION are proposed in addition to the actual NTSC standard. The pixel number of the HIVISION system is 5 times as that of the actual NTSC TV system. The image quality of hardcopy prepared by HIVISION signal (HIVISION hard-copy) is extreamely clearer than that formed by NTSC signal (video-hardcopy).
On the hand-held size (cabinet size) HIVISION hardcopy, a pixel shows equivalent size to that determined by limited resolution of human eye on well seeing distance. Moreover the pixel numberof HIVISION hardcopy is estimated to be as that of photographic color print printed by enlargement of 24×18 mm
2 size negative color film. The noise and signal ratio (S/N) on the pixel of HIVISION hard-copy is better than that of traditional color print.
As the result, the fine imaging of video hardcopy is directly accomplished by changing of input signal standard. Furthermore, in the limited condition, the image quality of pictorial hardcopy can match up to the traditional photograpic color print.
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