Virtual Labs

Image Arithmetic

1. Two images have the same dimensions and are to be combined by adding the corresponding pixel values. Which condition is important for direct pixel-wise image addition?

a: The images should have the same dimensions Explanation

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b: The images must have different resolutions Explanation

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c: Only the boundary pixels should be available Explanation

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d: The images must contain only binary values Explanation

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2. Which operation calculates the absolute difference between corresponding pixels of two images?

a: Addition Explanation

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b: Multiplication Explanation

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c: Difference Explanation

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d: Division Explanation

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3. Which of the following can occur when two 8-bit images are added without immediately adjusting the output range?

a: The output pixel can never exceed 255 Explanation

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b: The output pixel can have a value as high as 510 Explanation

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c: The output pixel must always be negative Explanation

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d: The output image must become binary Explanation

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4. An 8-bit image is obtained after adding two images, and some calculated pixel values are greater than 255. Which approach limits those values to the valid 8-bit range without remapping the entire result range?

a: Auto-scaling Explanation

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b: Division Explanation

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c: Clipping Explanation

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d: Difference Explanation

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5. A difference image is calculated using two images A and B. If A(x,y) = 180 and B(x,y) = 230, what is the resulting pixel value?

a: 50 Explanation

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b: -50 Explanation

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c: 410 Explanation

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d: 230 Explanation

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6. Which statement best describes auto-scaling of the result of an image arithmetic operation?

a: It replaces every negative value with 0 and every value above 255 with 255 Explanation

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b: It changes the dimensions of the output image Explanation

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c: It converts the result into a binary image Explanation

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d: It remaps the result values so that the output fits the desired range Explanation

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7. A pixel-wise multiplication is performed on two 8-bit images. If both corresponding pixels have the value 200, what is the unadjusted output value?

a: 400 Explanation

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b: 20000 Explanation

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c: 40000 Explanation

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d: 65025 Explanation

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8. A difference operation is used to compare a test image with a reference image. A large output value at a particular pixel indicates what?

a: The corresponding pixels have similar values Explanation

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b: The corresponding pixels have different values Explanation

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c: The two images have different dimensions Explanation

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d: The corresponding pixels are both zero Explanation

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9. Why can auto-scaling be useful after an image arithmetic operation produces a wide range of pixel values?

a: It maps the result to a suitable display range such as 0 to 255 Explanation

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b: It guarantees that the original pixel values remain unchanged Explanation

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c: It removes the need for corresponding pixels in the input images Explanation

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d: It converts every arithmetic operation into subtraction Explanation

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