A convenience store needs a camera to cover the entrance. Identification is needed at 80 pixels per face. Given that the scene is 2 m (6 ft 7 in) wide, which of these resolutions is the minimum one needed?
A) 640X480
B) 800 X 600
C) 1280 X 720
D) 1920 X 1080

Question

Quizplus · Accepted Answer

To calculate the minimum resolution needed, we need to determine the number of pixels per meter. 
2 meters = 200 cm = 2000 mm 
80 pixels per face * 2 faces (front and side) = 160 pixels per meter 
Therefore, the minimum resolution needed is: 160 pixels/meter * 2 meters = 320 pixels wide 
Out of the given options, only C has a width of 1280 pixels, which is more than the minimum needed (1280 > 320). Therefore, option C is the best choice.

A Convenience Store Needs a Camera to Cover the Entrance