Lecture Notes - Video

Question 1

For colour pictures, what were the colour components encoded by?

Answer 1

QAM

Question 2

What is the interlaced scanning pattern?

Answer 2

The odd and even lines of each picture are read out alternatively, allowing four a double of the framerate, at the expense of the spatial resolution.

Question 3

What is the bayer pattern

Answer 3

1. Image sensors are organised in a colour filter array.
2. Colour filters are laid out such as to mimick the cones in the human eye retina, using twice as many green elements as blue or red.

Question 4

Explain what white balance is

Answer 4

White balance is the process of making the colours appear more correct to the human eyes

Question 5

Explain rolling shutter

Answer 5

1. Due to multiplexing configuration of the CMOS sensor.
2. Rows are read in sequence, one at a time.
3. Time delay between the capture of top and bottom row -> cause distortion artefacts

Question 6

Explain the optical anti-aliasing filter.

Answer 6

1. Cameras are usually fitted with an optical anti-aliasing filter, which is simply put a piece of glass that blurs the image.
2. Cut off frequencies at the Nqyuist Freq. and avoid aliasing due to the sampling process of the sensor.