Question

which scheme indicating both horizontal and vertical sub sampling​

Answer 1

Answer:

Chroma subsampling is the practice of encoding images by implementing less resolution for chroma information than for luma information, taking advantage of the human visual system's lower acuity for color differences than for luminance.[1]

It is used in many video encoding schemes – both analog and digital – and also in JPEG encoding.

Answer 2

Answer:

Chroma subsampling is the practice of encoding images by implementing less resolution for chroma information than for luma information, taking advantage of the human visual system's lower acuity for color differences than for luminance.[1]

It is used in many video encoding schemes – both analog and digital – and also in JPEG encoding.