Question

A solid-state camera has a 256 x 256 pixel matrix. The analogue-to-digital converter takes 0.20 microseconds (0.20 x 10-6 sec) to convert the analogue charge signal for each pixel into the corresponding digital signal. If there is no time loss in switching between pixels, determine the following: (a) how much time is required to collect the image data for one frame? (b) Is the time determined in part (a) compatible with the processing rate of 30 frames per second?

Answer 1

One frame of the solid state camera has a pixel area of 256 x 256 , i.e. it consists of 256 x 256 = 65536 pixels

Assuming no time loss is there to switch between pixels,

To convert one pixel from analogue to digital it takes 0.2 x 10 ^-6 seconds.

(a) Hence to convert 65536 pixels (one frame) it takes 0.2 x  10 ^-6 x 65536 = 0.0131072 seconds.

(b) In 0.0131072 seconds , 1 frame is converted.

So in 1 second ,

Hence a processing rate of 30 frames per second (which is less than 76 frames per second) is very much compatible with this system.