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Digital Image Processing for RS Questions and Answers

1.

In a false - color set, human visual perception is limited to how many independent coordinates ?

Exam Year(s)

UGC NET - 2012,

Answer: A

Human colour vision is trichromatic: it is described by three independent coordinates, which can be the responses of the three cone types or hue, saturation and intensity. In a false colour set the image bands are assigned to the three display primaries, red, green and blue, so the observer can use only three independent coordinates. One, four or five coordinates do not describe human visual perception of colour.

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2.

Darkest level of the associated color (RGB) would have brightness value equal to

Exam Year(s)

UGC NET - 2012,

Answer: A

In an eight bit RGB image each colour channel takes values from 0 to 255, where 0 means no light and 255 means full brightness. The darkest level of a colour is therefore 0, which is black in that channel. The value 256 lies outside the range of an 8-bit channel, 255 is the brightest level and not the darkest, and 2047 is the top of an 11-bit scale, so none of them is the darkest level. Black in an RGB display means all three channels are at the minimum, so the darkest level of any one colour channel is the value 0 in 8-bit data.

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