Image Processing – MCQs — Multimedia System MCQs

1. What is the primary goal of image processing?
(A) Store data efficiently
(B) Extract meaningful information from images
(C) Compress video files
(D) Improve audio quality

2. Which of the following is an example of image enhancement?
(A) Edge detection
(B) Image compression
(C) Noise removal
(D) Image segmentation

3. Which domain uses Fourier Transform in image processing?
(A) Spatial domain
(B) Frequency domain
(C) Time domain
(D) Color domain

4. What does a histogram of an image represent?
(A) Distribution of image colors
(B) Distribution of pixel intensities
(C) Shape of objects in an image
(D) Image compression ratio

5. Which filter is best for reducing salt-and-pepper noise?
(A) Mean filter
(B) Gaussian filter
(C) Median filter
(D) Sobel filter

6. Which of the following is a first-order derivative operator?
(A) Laplacian
(B) Sobel
(C) Gaussian
(D) Mean

7. Which type of noise appears as random black and white pixels in an image?
(A) Gaussian noise
(B) Speckle noise
(C) Salt-and-pepper noise
(D) Poisson noise

8. In image sharpening, the Laplacian operator is used to detect:
(A) Color changes
(B) Edges
(C) Brightness levels
(D) Noise levels

9. Which process is used to separate an image into its object and background regions?
(A) Filtering
(B) Segmentation
(C) Compression
(D) Enhancement

10. Which method can improve the contrast of an image?
(A) Histogram equalization
(B) Image scaling
(C) Edge detection
(D) Compression

11. Which transform is commonly used for image compression?
(A) Fourier Transform
(B) Discrete Cosine Transform
(C) Laplace Transform
(D) Sobel Transform

12. Which technique reduces high-frequency noise while preserving edges?
(A) Gaussian smoothing
(B) Median filtering
(C) Laplacian sharpening
(D) Histogram equalization

13. Which type of filter uses a weighted average of neighboring pixels?
(A) Median filter
(B) Gaussian filter
(C) Sobel filter
(D) Laplacian filter

14. In image processing, interpolation is used for:
(A) Noise removal
(B) Image compression
(C) Resizing images
(D) Segmentation

15. Which morphological operation removes small objects from an image?
(A) Dilation
(B) Erosion
(C) Opening
(D) Closing

16. Which morphological operation fills small holes in objects?
(A) Dilation
(B) Erosion
(C) Opening
(D) Closing

17. Which of the following is a color model used in image processing?
(A) RGB
(B) ASCII
(C) XML
(D) SQL

18. Which edge detection method uses a pair of convolution masks to detect horizontal and vertical edges?
(A) Laplacian
(B) Sobel
(C) Gaussian
(D) Median

19. Which operation increases the size of objects in a binary image?
(A) Erosion
(B) Dilation
(C) Opening
(D) Closing

20. Which type of image is represented by continuous values of intensity?
(A) Binary image
(B) Grayscale image
(C) Color image
(D) Continuous-tone image

21. What is the purpose of image registration?
(A) Align multiple images into a common coordinate system
(B) Compress an image
(C) Change image format
(D) Reduce noise

22. Which transform converts spatial data into frequency components?
(A) Wavelet Transform
(B) Discrete Cosine Transform
(C) Fourier Transform
(D) Laplace Transform

23. Which type of filter is effective in removing Gaussian noise?
(A) Mean filter
(B) Median filter
(C) High-pass filter
(D) Sobel filter

24. Which is an application of image segmentation?
(A) Medical image analysis
(B) Histogram equalization
(C) Noise addition
(D) Image compression

25. Which term refers to reducing the number of bits required to store an image?
(A) Image enhancement
(B) Image compression
(C) Image scaling
(D) Image registration

26. Which is a high-pass filtering technique?
(A) Laplacian filter
(B) Gaussian filter
(C) Median filter
(D) Mean filter

27. What is the main effect of low-pass filtering?
(A) Edge enhancement
(B) Noise smoothing
(C) Contrast stretching
(D) Edge detection

28. Which method is used to improve image clarity in blurred images?
(A) Histogram equalization
(B) Image restoration
(C) Thresholding
(D) Morphological operations

29. What does thresholding do in image processing?
(A) Enhances edges
(B) Converts a grayscale image to binary
(C) Reduces noise
(D) Improves contrast

30. Which of the following is an edge detection technique?
(A) Prewitt operator
(B) Mean filter
(C) Gaussian smoothing
(D) Histogram equalization

31. What is the range of intensity values in an 8-bit grayscale image?
(A) 0–255
(B) 0–100
(C) 0–512
(D) 0–127

32. Which operation is performed in frequency domain filtering?
(A) Convolution in spatial domain
(B) Multiplication in frequency domain
(C) Addition of images
(D) Thresholding

33. Which transform is suitable for analyzing both spatial and frequency information?
(A) Fourier Transform
(B) Wavelet Transform
(C) Discrete Cosine Transform
(D) Laplacian Transform

34. Which process helps in highlighting fine details in an image?
(A) Smoothing
(B) Sharpening
(C) Compression
(D) Morphology

35. Which operation in image processing is used to combine two images?
(A) Thresholding
(B) Image addition
(C) Filtering
(D) Morphology

36. Which is the first step in most digital image processing systems?
(A) Image enhancement
(B) Image acquisition
(C) Image segmentation
(D) Image compression

37. Which process removes periodic noise in an image?
(A) Low-pass filtering
(B) Band-stop filtering
(C) High-pass filtering
(D) Histogram equalization

38. Which method uses multiple threshold values to segment an image?
(A) Adaptive thresholding
(B) Multi-level thresholding
(C) Global thresholding
(D) Otsu’s method

39. Which type of image contains only two intensity values?
(A) Binary image
(B) Grayscale image
(C) Color image
(D) Indexed image

40. Which operator detects edges by computing the second derivative of intensity?
(A) Laplacian operator
(B) Sobel operator
(C) Prewitt operator
(D) Gaussian filter

41. Which transform is used in JPEG image compression?
(A) Discrete Cosine Transform
(B) Fourier Transform
(C) Wavelet Transform
(D) Laplace Transform

42. Which method adapts the threshold based on local image properties?
(A) Global thresholding
(B) Adaptive thresholding
(C) Multi-level thresholding
(D) Morphological thresholding

43. Which image processing technique is used for removing blur caused by camera motion?
(A) Image deblurring
(B) Histogram equalization
(C) Morphological filtering
(D) Thresholding

44. Which operator uses a 3×3 mask for edge detection?
(A) Sobel operator
(B) Median filter
(C) Gaussian filter
(D) Laplacian operator

45. Which frequency domain filter allows low frequencies to pass and blocks high frequencies?
(A) Low-pass filter
(B) High-pass filter
(C) Band-pass filter
(D) Band-stop filter

46. Which technique enhances image details by boosting high-frequency components?
(A) High-boost filtering
(B) Low-pass filtering
(C) Median filtering
(D) Morphological filtering

47. Which morphological operation is erosion followed by dilation?
(A) Opening
(B) Closing
(C) Dilation
(D) Hit-or-miss transform

48. Which morphological operation is dilation followed by erosion?
(A) Opening
(B) Closing
(C) Erosion
(D) Hit-or-miss transform