Deep Learning for Computer Vision · Quiz 1 · May 2025

If we use top-k sampling with k=2 at timestep 1, what is the normalized probability of selecting token “sky” at the timestep=1?

Which of the following statements is **false**?

Which of the following statements is **True**?

During the double thresholding step in Canny edge detection, the high threshold is set at 100 and the low threshold is 40. A pixel gradient magnitude of 65 will be classified as:

Which of the following statements are True?

Which of the following statements are **true**?(Select all that apply)

Which of the following statements are **true** ?(Select all that apply)

Consider the following statements. Which of the following statements are true?

Which of the following statements are **false**?

The gradient of an image I points in the direction of the most rapid change in intensity. Taking image derivatives accentuates (a)_________________ frequencies and hence amplifies noise, since the proportion of noise to signal is larger at (b) _________________frequencies. The common solution is to smooth the image prior to computing gradients. Based on the above data, answer the given subquestions.

Enter the correct answer for Blank (a): **NOTE:** Enter the exact answer without any extra space in the beginning or at the end.

The gradient of an image I points in the direction of the most rapid change in intensity. Taking image derivatives accentuates (a)_________________ frequencies and hence amplifies noise, since the proportion of noise to signal is larger at (b) _________________frequencies. The common solution is to smooth the image prior to computing gradients. Based on the above data, answer the given subquestions.

Enter the correct answer for Blank (b): **NOTE:** Enter the exact answer without any extra space in the beginning or at the end.

In Canny edge detection, a large value of the Gaussian kernel spread σ leads to (a)________________ edges, while a small value of σ leads to (b)_________________ edges. Based on the above data, answer the given subquestions.

Enter the correct answer for Blank (a) : **NOTE:** Enter the exact answer without any extra space in the beginning or at the end.

In Canny edge detection, a large value of the Gaussian kernel spread σ leads to (a)________________ edges, while a small value of σ leads to (b)_________________ edges. Based on the above data, answer the given subquestions.

Enter the correct answer for Blank (b) : **NOTE:** Enter the exact answer without any extra space in the beginning or at the end.

You have a visual codebook with 1500 visual words. From a test image, you extract 1200 SIFT descriptors, each of 128 dimensions. After assigning each descriptor to its nearest visual word, you compute the Bag-of-Words histogram by counting descriptor assignments. Based on the above data, answer the given subquestions.

What is the dimensionality of the Bag-of-Words (BoW) feature vector for this image?________________

You have a visual codebook with 1500 visual words. From a test image, you extract 1200 SIFT descriptors, each of 128 dimensions. After assigning each descriptor to its nearest visual word, you compute the Bag-of-Words histogram by counting descriptor assignments. Based on the above data, answer the given subquestions.

If instead, you concatenate all the 1200 descriptors into a single vector (without using BoW), what will be the dimensionality of that vector?__________________