1. : What is the primary use of image addition in digital image processing?
(A) Enhance image brightness
(B) Reduce contrast
(C) Sharpen edges
(D) Reduce size
2. : Image subtraction is most commonly used for which application?
(A) Image encryption
(B) Motion detection
(C) Color enhancement
(D) Noise addition
3. : What happens when two identical images are subtracted?
(A) A bright image is obtained
(B) A noisy image is obtained
(C) A black image is obtained
(D) A white image is obtained
4. : Which arithmetic operation is useful for detecting differences between two images?
(A) Addition
(B) Subtraction
(C) Multiplication
(D) Division
5. : Which arithmetic operation is typically used for image masking?
(A) Addition
(B) Subtraction
(C) Multiplication
(D) Division
6. : What is the result of dividing an image by itself (ignoring divide-by-zero)?
(A) A black image
(B) A white image
(C) A noisy image
(D) An unchanged image
7. : What happens to an image when it is multiplied by a constant greater than 1?
(A) It gets darker
(B) It becomes more blurry
(C) It gets brighter
(D) It inverts
8. : Which arithmetic operation can lead to pixel overflow if not controlled?
(A) Subtraction
(B) Addition
(C) Division
(D) All of the above
9. : Which operation is generally used in image blending?
(A) Subtraction
(B) Division
(C) Addition
(D) Multiplication
10. : Multiplying two images is also known as:
(A) Image enhancement
(B) Image sharpening
(C) Image masking
(D) Image restoration
11. : If the result of subtraction is negative, what typically happens?
(A) It wraps around
(B) It is clipped to 0
(C) It becomes white
(D) It becomes transparent
12. : Which operation is sensitive to lighting changes in motion detection?
(A) Addition
(B) Subtraction
(C) Multiplication
(D) Division
13. : What is the result of adding a zero matrix to an image?
(A) Black image
(B) White image
(C) Same image
(D) Inverted image
14. : In image arithmetic, pixel values must be kept within:
(A) 0–100
(B) 0–200
(C) 0–255
(D) 0–512
15. : What is used to avoid division by zero in image division?
(A) Overflow flag
(B) Threshold
(C) Adding a small constant
(D) Log transformation
16. : Which arithmetic operation is generally used to normalize images?
(A) Multiplication
(B) Addition
(C) Subtraction
(D) Division
17. : In remote sensing, subtraction is used to:
(A) Blend images
(B) Detect changes
(C) Rotate images
(D) Resize images
18. : If an image is added to its negative, the result is:
(A) Zero
(B) Constant gray
(C) White
(D) Same as original
19. : Which of the following may cause loss of detail in an image?
(A) Multiplying by a large constant
(B) Subtracting small details
(C) Dividing by a large constant
(D) All of the above
20. : What is the main drawback of image subtraction?
(A) It always enhances the image
(B) It increases image sharpness
(C) It can produce negative values
(D) It increases color
21. : Which operation enhances contrast when applied between two similar images?
(A) Addition
(B) Subtraction
(C) Division
(D) Multiplication
22. : Which operation is used for brightness adjustment?
(A) Multiplication
(B) Subtraction
(C) Division
(D) Addition
23. : Image multiplication is used in:
(A) Edge detection
(B) Image segmentation
(C) Image masking
(D) Thresholding
24. : Which operation may introduce noise if pixel values are not handled properly?
(A) Multiplication
(B) Subtraction
(C) Division
(D) All of the above
25. : Subtracting a blurred image from the original produces:
(A) High-pass filtered image
(B) Low-pass filtered image
(C) Contrast-enhanced image
(D) Noise
26. : What is the function of scalar multiplication in image processing?
(A) Convert to grayscale
(B) Apply gamma correction
(C) Control brightness/contrast
(D) Remove background
27. : What can be a potential effect of repeated image addition?
(A) Overexposure
(B) Blurring
(C) Sharpening
(D) Color inversion
28. : Division in image processing is rarely used because:
(A) It’s computationally expensive
(B) It always reduces contrast
(C) It causes inversion
(D) It creates artifacts easily
29. : Multiplying an image by a mask matrix results in:
(A) No change
(B) Sharpened image
(C) Selected regions preserved
(D) Edge detection
30. : In image arithmetic, underflow occurs when:
(A) Values exceed 255
(B) Values drop below 0
(C) Pixels are multiplied
(D) Images are divided
31. : What is a common use of image addition in medical imaging?
(A) CT enhancement
(B) MRI subtraction
(C) PET-CT fusion
(D) Noise filtering
32. : Which operation is used to enhance moving objects in a video sequence?
(A) Subtraction
(B) Multiplication
(C) Addition
(D) Division
33. : Division by small values in image division can result in:
(A) High values (spikes)
(B) Blurring
(C) Zero image
(D) Negative image
34. : What will be the result of adding two saturated images?
(A) Low contrast image
(B) Overexposed image
(C) Blurred image
(D) Original image
35. : What is the result of subtracting a high-intensity image from a low-intensity image?
(A) White image
(B) Zero image
(C) Negative values clipped to zero
(D) Sharp edges
36. : Which operation is not typically used for edge enhancement?
(A) Addition
(B) Subtraction
(C) Multiplication
(D) None of the above
37. : What kind of images result from multiplying by values less than 1?
(A) Brighter
(B) Darker
(C) Sharper
(D) Noisy
38. : What is the purpose of pixel-wise operations in image arithmetic?
(A) Compression
(B) Feature detection
(C) Pixel-level manipulation
(D) Morphological operations
39. : Which arithmetic operation is best for change detection?
(A) Addition
(B) Subtraction
(C) Division
(D) Rotation
40. : What does dynamic range compression often involve?
(A) Multiplication
(B) Subtraction
(C) Division
(D) Log transformation
41. : Image subtraction assumes the images are:
(A) In different formats
(B) Captured under identical conditions
(C) Grayscale only
(D) Binary
42. : Which arithmetic operation reduces image sharpness when repeated?
(A) Subtraction
(B) Addition
(C) Multiplication
(D) All of the above
43. : What happens when you subtract a mask from an image?
(A) Highlights masked region
(B) Dims the entire image
(C) Sharpens the background
(D) Enhances contrast
44. : Which operation is essential for image normalization?
(A) Subtraction
(B) Division
(C) Multiplication
(D) Addition
45. : Which operation may create division-by-zero problems?
(A) Subtraction
(B) Addition
(C) Division
(D) Multiplication
46. : What’s the advantage of using multiplication over masking with logical operators?
(A) Simplicity and speed
(B) Better accuracy
(C) Color enhancement
(D) Reduces computation
47. : What is the term for adding a constant value to every pixel?
(A) Image scaling
(B) Brightness shift
(C) Thresholding
(D) Equalization
48. : When performing image arithmetic, pixel values are usually stored as:
(A) Strings
(B) Binary values
(C) Unsigned integers
(D) Floating points only
49. : The maximum value after adding two pixels of value 200 each is:
(A) 255
(B) 200
(C) 400
(D) Undefined
50. : What is required before performing any arithmetic operation on images?
(A) Same histogram
(B) Same resolution and dimensions
(C) Same noise level
(D) Same color model
