Radiometric Calibration in Image Enhancement Quiz

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What is the main reason for rescaling image brightness?

To decrease the contrast in images
To accommodate human vision, photographic films, and computer displays (correct)
To increase the maximum possible range of values to 0-255
To obscure important details in images

Why might an image have poor contrast on a display if the display can only show a range from 0-63?

Because the image's full range of values cannot be accommodated by the display (correct)
Because the image contains too many bright pixels
Because the display will automatically enhance the image contrast
Because the display uses a different color scheme

How does contrast enhancement impact image pixels?

It blurs the details in the image
It alters each pixel value to utilize the full range of brightness values (correct)
It changes the color scheme of the image pixels
It reduces the number of pixels in the image

In what way does image enhancement affect detail visibility in darker regions of an image?

It makes details in darker regions more clearly visible (D) Signup and view all the answers

What determines the selection of an appropriate technique to improve the quality of a displayed image?

The image itself, user experience, and specific problem (A) Signup and view all the answers

Why are alternative approaches proposed to improve image quality?

To cater for different user experiences and specific image problems (D) Signup and view all the answers

What is the main advantage of digital imagery mentioned in the text?

Allows manipulation of digital pixel values (B) Signup and view all the answers

Why may radiometric corrections still be necessary even if done prior to data distribution?

To optimize the image for visual interpretation (A) Signup and view all the answers

Why is a generic radiometric correction not sufficient for all targets according to the text?

Targets have varying spectral responses (D) Signup and view all the answers

What is the main objective of image enhancement as described in the text?

Improving visual appearance of digital images (D) Signup and view all the answers

Why is custom adjustment often necessary for brightness values in image enhancement?

To account for specific application needs (A) Signup and view all the answers

Which factor necessitates remote sensing devices to be designed for various levels of energy?

Diverse range of target backgrounds (A) Signup and view all the answers

What is the primary purpose of density slicing in image processing?

To emphasize specific features by assigning colors to brightness intervals (D) Signup and view all the answers

How does edge enhancement impact visual transitions between bright and dark regions?

It magnifies local contrast to reinforce transitions (D) Signup and view all the answers

In edge enhancement, what is the role of the Laplacian filter?

It magnifies local contrast to enhance edges (D) Signup and view all the answers

Why is density slicing not considered to provide additional information compared to the original image?

Because it assigns colors arbitrarily to brightness intervals (C) Signup and view all the answers

What effect does edge enhancement have on noise and distinctiveness of visual transitions?

It increases noise and makes transitions blurrier (C) Signup and view all the answers

Which statement best describes the purpose of edge enhancement filters?

To magnify local contrast for reinforcing sharp edges (D) Signup and view all the answers

What does linear stretch do to the original digital values?

Converts them into a new distribution using new minimum and maximum values (D) Signup and view all the answers

How does piecewise linear stretch differ from linear stretch?

It divides the brightness range into segments before stretching each segment individually (B) Signup and view all the answers

What is the main difference between histogram equalization and contrast stretching?

Histogram equalization applies a nonlinear function to reassign brightness evenly, while contrast stretching uses linear scaling (B) Signup and view all the answers

Why is histogram equalization effective in enhancing image detail?

Because it applies a nonlinear function to achieve uniform distribution of intensities (C) Signup and view all the answers

What is the purpose of dividing the original brightness range into segments in piecewise linear stretch?

To emphasize certain segments of brightness for specific applications (C) Signup and view all the answers

What effect does linear stretch have on old intermediate values?

Scales them proportionately between new minimum and maximum values (B) Signup and view all the answers

What is the purpose of the edge-enhancement procedure described by Rohde et al. (1978)?

To accentuate differences in brightness, especially at edges where values differ greatly from the local average. (B) Signup and view all the answers

How is the new digital value calculated in the edge-enhancement procedure according to the text?

By taking the sum of twice the input value and the local average. (D) Signup and view all the answers

What effect does applying a constant have in the edge-enhancement procedure?

It alters the effect of enhancement as needed in specific situations. (B) Signup and view all the answers

How does the output value change brightness levels in Rohde et al.'s edge-enhancement procedure?

It highlights differences in brightness at edges. (B) Signup and view all the answers

In Rohde et al.'s edge-enhancement method, what does twice the input value represent in relation to the local average?

It intensifies differences between pixel values and the local average. (D) Signup and view all the answers

What is the significance of accentuating differences in brightness in an image, as done in Rohde et al.'s edge-enhancement technique?

To enhance visual contrast and highlight edge features. (C) Signup and view all the answers