Machine Learning Computer Vision 3

Question 1

What is the role of the Region Proposal Network (RPN) in Faster R-CNN?

Accepted Answer

Generating candidate object bounding boxes

Answer

The RPN scans the feature map to propose regions that likely contain objects, replacing slower external proposal methods.

Question 2

Which metric is used to measure the overlap between a predicted bounding box and the ground truth box?

Accepted Answer

Intersection over Union (IoU)

Answer

IoU computes the ratio of the intersection area to the union area of two bounding boxes, quantifying localization accuracy.

Question 3

In image processing, what does a Sobel filter detect?

Accepted Answer

Edges via intensity gradients

Answer

The Sobel filter computes image intensity gradients in horizontal and vertical directions, highlighting edges in the image.

Question 4

What is instance segmentation, and how does it differ from semantic segmentation?

Accepted Answer

It distinguishes individual object instances with separate masks, while semantic segmentation does not differentiate instances

Answer

Instance segmentation identifies and masks each individual object separately, whereas semantic segmentation groups all pixels of the same class together without distinguishing instances.

Question 5

Which technique is used in GANs to generate photorealistic images by training a generator against a discriminator?

Accepted Answer

Adversarial training

Answer

Adversarial training pits the generator against the discriminator in a minimax game, driving the generator to produce increasingly realistic outputs.

Machine Learning Practice Test

Machine Learning Practice Test

Machine Learning Computer Vision 3