Image sensors and optical devices

Which correctly describes a "12-megapixel" image sensor?

  1. AAbout 12 million light-receiving pixels are arranged on it
  2. BIt can capture 12 million images per second
  3. CIt can distinguish 12 million colors
Show answer and explanation

Answer: A. About 12 million light-receiving pixels are arranged on it

The pixel count is the number of light-receiving elements (pixels) arranged on the image sensor. A 12-megapixel sensor has, for example, about 4,000 × 3,000 pixels. Capture speed is the frame rate, and the number of colors is set by the gradation (bit depth); these are separate specifications.

  • A. Correct. About 12 million pixels are arranged on it.
  • B. Images per second is expressed by the frame rate.
  • C. The number of distinguishable colors depends on gradation, not pixel count.
Practice this topic Back to topic

More Image sensors and optical devices questions

  1. In image sensors that capture color images, why must color filters be placed over the pixels?
  2. Which image sensor is mainly used in current smartphone cameras?
  3. When the light falling on a reverse-biased photodiode becomes stronger, how does the current (photocurrent) change?
  4. Why do images taken in dark places look grainy (with conspicuous noise)?
  5. Which correctly describes the "conversion gain" of a CMOS image sensor?