Radiometric Calibration in Image Enhancement Quiz
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Questions and Answers

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?

    <p>It makes details in darker regions more clearly visible</p> Signup and view all the answers

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

    <p>The image itself, user experience, and specific problem</p> Signup and view all the answers

    Why are alternative approaches proposed to improve image quality?

    <p>To cater for different user experiences and specific image problems</p> Signup and view all the answers

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

    <p>Allows manipulation of digital pixel values</p> Signup and view all the answers

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

    <p>To optimize the image for visual interpretation</p> Signup and view all the answers

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

    <p>Targets have varying spectral responses</p> Signup and view all the answers

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

    <p>Improving visual appearance of digital images</p> Signup and view all the answers

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

    <p>To account for specific application needs</p> Signup and view all the answers

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

    <p>Diverse range of target backgrounds</p> Signup and view all the answers

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

    <p>To emphasize specific features by assigning colors to brightness intervals</p> Signup and view all the answers

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

    <p>It magnifies local contrast to reinforce transitions</p> Signup and view all the answers

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

    <p>It magnifies local contrast to enhance edges</p> Signup and view all the answers

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

    <p>Because it assigns colors arbitrarily to brightness intervals</p> Signup and view all the answers

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

    <p>It increases noise and makes transitions blurrier</p> Signup and view all the answers

    Which statement best describes the purpose of edge enhancement filters?

    <p>To magnify local contrast for reinforcing sharp edges</p> Signup and view all the answers

    What does linear stretch do to the original digital values?

    <p>Converts them into a new distribution using new minimum and maximum values</p> Signup and view all the answers

    How does piecewise linear stretch differ from linear stretch?

    <p>It divides the brightness range into segments before stretching each segment individually</p> Signup and view all the answers

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

    <p>Histogram equalization applies a nonlinear function to reassign brightness evenly, while contrast stretching uses linear scaling</p> Signup and view all the answers

    Why is histogram equalization effective in enhancing image detail?

    <p>Because it applies a nonlinear function to achieve uniform distribution of intensities</p> Signup and view all the answers

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

    <p>To emphasize certain segments of brightness for specific applications</p> Signup and view all the answers

    What effect does linear stretch have on old intermediate values?

    <p>Scales them proportionately between new minimum and maximum values</p> Signup and view all the answers

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

    <p>To accentuate differences in brightness, especially at edges where values differ greatly from the local average.</p> Signup and view all the answers

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

    <p>By taking the sum of twice the input value and the local average.</p> Signup and view all the answers

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

    <p>It alters the effect of enhancement as needed in specific situations.</p> Signup and view all the answers

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

    <p>It highlights differences in brightness at edges.</p> 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?

    <p>It intensifies differences between pixel values and the local average.</p> 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?

    <p>To enhance visual contrast and highlight edge features.</p> Signup and view all the answers

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