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Image Filtering for Noise Removal

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Questions and Answers

What is one of the primary uses of both linear and non-linear filtering in image enhancement?

Color correction

Edge detection

Noise removal (correct)

Contrast enhancement

What type of noise is commonly targeted for removal using different filters in image enhancement?

Gaussian noise

'Salt and sugar' noise

Uniform noise

'Salt and pepper' noise (correct)

What is the effect of mean filtering on an image?

Blurs the image by replacing each pixel with the median value from its neighborhood

Smoothes the image by replacing each pixel with the mean value from its neighborhood (correct)

Introduces more noise into the image

Enhances the edges of the image

Which type of noise does the 'Isp' variable represent in the given code snippet?

'Salt and pepper' noise with 0.03 intensity Signup and view all the answers

What is the primary purpose of adding noise to an image in the given code snippet?

To simulate real-world scenarios Signup and view all the answers

How does a mean filter differ from a median filter in image processing?

A mean filter tends to blur images more than a median filter Signup and view all the answers

What is a drawback of mean filtering?

It is not robust to large noise deviations in the image Signup and view all the answers

What is the main advantage of median filtering over mean filtering?

It is better at preserving sharp high-frequency detail Signup and view all the answers

How does increasing the neighborhood size for mean filtering affect the resulting image?

It causes blurring and loss of high-frequency image detail Signup and view all the answers

What type of noise is best dealt with using a measure that is robust to statistical outliers?

'Salt and pepper' noise Signup and view all the answers

What is the effect of applying a median filter to an image with 'salt and pepper' noise?

It preserves sharp high-frequency detail while eliminating the noise Signup and view all the answers

How does the median filter compare to the mean filter in terms of computational cost?

The median filter has higher computational cost Signup and view all the answers

What does it mean when a filter is described as 'robust to statistical outliers'?

It is unaffected by extreme values in the data Signup and view all the answers

Why is mean filtering not effective for 'salt and pepper' noise?

'Salt and pepper' noise consists of statistical outliers which mean filtering is not robust to Signup and view all the answers

In general, what are the drawbacks of mean filtering?

'Salt and pepper' noise remains visible within the image Signup and view all the answers

'Salt and pepper' noise consists of:

'Statistical outliers' Signup and view all the answers