Image Enhancement - Spatial Filtering Quiz

Which domain does spatial image filtering operate on?

• Color

• Time

• Frequency

• Spatial

What is the visual effect of lowpass/smoothing spatial filtering?

• Enhanced edges

• No effect

• Reduced noise but blurred edge

• Highlighted fine detail

Which type of filter is an example of a smoothing linear filter?

• Derivative filter

• Averaging filter

• Highpass filter

• Median filter

What is the purpose of sharpening spatial filters?

• To smooth the image

• To highlight edges and fine detail

• To reduce noise

• To blur the image

What does spatial differentiation measure?

• Noise level

• Rate of change of a function

• Color intensity

• Image resolution

What is the formula for the 1st derivative of a function?

• f(x) - f(x-1)

• f(x) + f(x-1)

• f(x) - f(x+1)

• f(x+1) - f(x)

What does the Laplacian filter highlight in an image?

• Color variations

• Smooth areas

• Noise and artifacts

• Edges and other discontinuities

What is the result of subtracting the Laplacian result from the original image?

• A sharpened enhanced image

• A blurred image

• A black and white image

• No change in the image

What is the purpose of Sobel filters?

• To reduce noise

• To enhance color

• To detect edges

• To smooth the image

What is the main difference between 1st and 2nd order derivatives?

• Thicker edges vs. stronger response to fine detail

• Highlighted fine detail vs. blurred edge

• Stronger response to grey level step vs. double response at step changes

• Enhanced edges vs. reduced noise