Digital Image Processing Questions and
Answers with Certified Solutions
What is digital image processing?
✔✔ The use of algorithms and computational techniques to manipulate and enhance digital
images.
What is the purpose of image enhancement?
✔✔ To improve the visual quality of an image by adjusting brightness, contrast, or sharpness.
What is thresholding in digital image processing?
✔✔ A technique used to convert an image into binary form by setting a specific intensity value
as a cutoff.
What is edge detection?
✔✔ A method used to identify the boundaries of objects within an image by detecting changes in
intensity.
What is convolution in image processing?
1
,✔✔ A mathematical operation that applies a filter or kernel to an image to enhance or detect
specific features.
What is a kernel in digital image processing?
✔✔ A small matrix used in convolution operations to apply filters such as sharpening, blurring,
or edge detection.
What is histogram equalization?
✔✔ A technique used to improve contrast by redistributing pixel intensity values across an
image.
What is image segmentation?
✔✔ The process of dividing an image into different regions based on color, intensity, or texture.
What is morphological processing in digital imaging?
✔✔ A set of operations that process images based on shapes, often used for noise removal or
object detection.
What is noise reduction in digital image processing?
2
,✔✔ A technique used to remove unwanted variations in pixel values that can distort an image.
What is a median filter?
✔✔ A noise reduction filter that replaces each pixel’s value with the median of its neighboring
pixels to remove speckle or salt-and-pepper noise.
What is a Gaussian filter?
✔✔ A smoothing filter that reduces noise and detail in an image by applying a Gaussian
function.
What is image restoration?
✔✔ The process of recovering an image that has been degraded due to factors like motion blur
or noise.
What is a Fourier Transform in image processing?
✔✔ A mathematical technique used to convert an image from the spatial domain to the
frequency domain for filtering or analysis.
What is the difference between spatial domain and frequency domain processing?
3
, ✔✔ Spatial domain processing modifies pixel values directly, while frequency domain
processing analyzes and modifies image components in terms of frequency.
What is an adaptive filter in digital imaging?
✔✔ A filter that adjusts its behavior based on local image characteristics to improve image
quality.
What is image interpolation?
✔✔ A technique used to resize images by estimating new pixel values based on surrounding
pixels.
What is a region-growing algorithm in image processing?
✔✔ A method used for image segmentation by grouping pixels with similar characteristics into
larger regions.
What is object recognition in digital image processing?
✔✔ A process of identifying and classifying objects within an image using pattern recognition
techniques.
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Answers with Certified Solutions
What is digital image processing?
✔✔ The use of algorithms and computational techniques to manipulate and enhance digital
images.
What is the purpose of image enhancement?
✔✔ To improve the visual quality of an image by adjusting brightness, contrast, or sharpness.
What is thresholding in digital image processing?
✔✔ A technique used to convert an image into binary form by setting a specific intensity value
as a cutoff.
What is edge detection?
✔✔ A method used to identify the boundaries of objects within an image by detecting changes in
intensity.
What is convolution in image processing?
1
,✔✔ A mathematical operation that applies a filter or kernel to an image to enhance or detect
specific features.
What is a kernel in digital image processing?
✔✔ A small matrix used in convolution operations to apply filters such as sharpening, blurring,
or edge detection.
What is histogram equalization?
✔✔ A technique used to improve contrast by redistributing pixel intensity values across an
image.
What is image segmentation?
✔✔ The process of dividing an image into different regions based on color, intensity, or texture.
What is morphological processing in digital imaging?
✔✔ A set of operations that process images based on shapes, often used for noise removal or
object detection.
What is noise reduction in digital image processing?
2
,✔✔ A technique used to remove unwanted variations in pixel values that can distort an image.
What is a median filter?
✔✔ A noise reduction filter that replaces each pixel’s value with the median of its neighboring
pixels to remove speckle or salt-and-pepper noise.
What is a Gaussian filter?
✔✔ A smoothing filter that reduces noise and detail in an image by applying a Gaussian
function.
What is image restoration?
✔✔ The process of recovering an image that has been degraded due to factors like motion blur
or noise.
What is a Fourier Transform in image processing?
✔✔ A mathematical technique used to convert an image from the spatial domain to the
frequency domain for filtering or analysis.
What is the difference between spatial domain and frequency domain processing?
3
, ✔✔ Spatial domain processing modifies pixel values directly, while frequency domain
processing analyzes and modifies image components in terms of frequency.
What is an adaptive filter in digital imaging?
✔✔ A filter that adjusts its behavior based on local image characteristics to improve image
quality.
What is image interpolation?
✔✔ A technique used to resize images by estimating new pixel values based on surrounding
pixels.
What is a region-growing algorithm in image processing?
✔✔ A method used for image segmentation by grouping pixels with similar characteristics into
larger regions.
What is object recognition in digital image processing?
✔✔ A process of identifying and classifying objects within an image using pattern recognition
techniques.
4
