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
