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18 Questions

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Image Acquisition in Computer Vision

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Questions and Answers

What is the purpose of digitization in image acquisition?

To emit infra-red radiation

To project the radiation onto a 2-dimensional image plane

To convert the continuous image into a discrete grid (correct)

To absorb electromagnetic radiation

What type of radiation is most widely used for visualization of objects and scenes?

Electromagnetic radiation (correct)

Infra-red radiation

Radio radiation

X-ray radiation

What is the range of wavelengths of visible light that is important for human and computer vision?

1000 to 1200 nm

200 to 400 nm

800 to 1000 nm

400 to 800 nm (correct)

What is the process of projecting the radiation originating from the 3-dimensional scene onto a 2-dimensional image plane?

Image formation Signup and view all the answers

What is the purpose of sampling in digitization?

To measure the radiation at discrete points on the image plane Signup and view all the answers

What is the result of digitization in the spatial domain and amplitude domain?

A digital image Signup and view all the answers

What is the main reason for the impression of motion in videos generated by a sequence of still images?

The frame-rate of the camera Signup and view all the answers

What is the process of mapping analog/continuous samples onto a discrete set of values?

Quantization Signup and view all the answers

What is the effect of quantization on the digitization process?

It introduces errors into the digitization process Signup and view all the answers

What is the outcome of the sampling process in the frequency domain?

A periodic replication of the spectrum of the sampled function Signup and view all the answers

What is the role of the sampling function in the sampling process?

To describe the effects of sampling in continuous space Signup and view all the answers

What is stored in the quantization process?

Indices i of discrete quantities bi Signup and view all the answers

What is the topology of the sensor arrangement in most image acquisition systems?

Regular 2-dimensional array Signup and view all the answers

What determines the quantization process?

Quantized values and associated intervals Signup and view all the answers

What is the characteristic of the quantization curve?

Not necessarily linear Signup and view all the answers

What is the purpose of the measurement in image acquisition?

To measure the intensity of the image Signup and view all the answers

What is the expression for the sampling function in the spatial domain?

s(x, y) = ∞ ∑ m=−∞ ∞ ∑ n=−∞ δ(x − m · ∆x, y − n · ∆y ) Signup and view all the answers

What is the result of convolving the signal function with the sampling function?

The sampled signal function with periodic replications Signup and view all the answers