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Definition of "frame memory" |
video memory required to store the number of picture elements for one complete frame of electronically scanned video information. The memory storage in bits can be computed by multiplying the number of video samples made per horizontal line, times the number of horizontal lines per field (vertical scan), times the number bits per sample, times the number of fields/frame. A sample consists of the information necessary to reproduce the color information. The NTSC television system consists of two interlaced fields per frame. Storage requirements are usually minimized by sampling the color video information consisting of the luminance (Y ) and the two color difference signals, (R−Y ) and (B−Y ). The color signal bandwidth is less than the luminance bandwidth that can be used to reduce the field memory storage requirements. Four samples of the luminance (Y ) signal is combined with two samples of the (R − Y ) signal and two samples of the (B − Y ) signal. The preceding video sampling techniques is designated as 4:2:2 sampling and reduces the field memory size by one third. |
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