Define following with respect to television: (i) Aspect ratio (ii) Vertical & Horizontal Resolution (iii) Interlace scanning (iv) Image continuity

Define following with respect to television: (i) Aspect ratio (ii) Vertical & Horizontal Resolution (iii) Interlace scanning (iv) Image continuity
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1 Answer

Answer :

(i) Aspect ratio: The aspect ratio of an image describes the proportional relationship between its width and its height. The frame adopted in all television systems is rectangular with width/height ratio, i.e., aspect ratio = 4/3. 

(ii) Vertical & Horizontal Resolution: The ability of the scanning system to resolve picture details in vertical direction is known as vertical resolution. The ability of the scanning system to resolve the picture details in the horizontal direction is known as horizontal resolution. 

(iii) Interlace scanning: The total numbers of lines are divided into two groups called ‘fields’. Each field is scanned alternately. This method of scanning is called ‘interlaced scanning’. 

(iv) Image continuity: As per the persistence of vision, if the scanning rate per second is made greater than sixteen, or the number of pictures shown per second is more than sixteen, the eye is able to integrate(mix) the changing levels of brightness in the scene. This is called as Image Continuity.
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