Computer Knowledge

Digital Image Processing

2,103 Questions

Digital image processing involves manipulating digital images through various algorithms to enhance their visual quality or extract information. Key concepts include noise reduction, high dynamic range imaging, color correction, and sharpening techniques. These concepts are essential for computer science exams and technical certifications.

Color management systemsNoise reduction techniquesHDR image combiningImage sharpening techniquesAlpha matting process

Digital Image Processing Questions

Multiple choice

What is the process of combining multiple images of the same area, taken at different times or from different sensors, called?

  1. Image fusion

  2. Image registration

  3. Image classification

  4. Image enhancement
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Image fusion combines information from multiple images to create a single composite image with enhanced spatial, spectral, or temporal resolution.

Multiple choice

Which type of image processing technique is used to reduce the number of colors in an image?

  1. Color quantization

  2. Edge detection

  3. Image segmentation

  4. Image classification
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Color quantization is a technique used to reduce the number of colors in an image by replacing similar colors with a representative color, thereby reducing the file size and improving compression.

Multiple choice

What is the process of removing unwanted noise from an image called?

  1. Image denoising

  2. Image segmentation

  3. Image classification

  4. Image enhancement
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Image denoising involves removing unwanted noise, such as sensor noise or atmospheric noise, from an image to improve its quality and enhance its interpretability.

Multiple choice

What is the process of converting an image from one coordinate system to another called?

  1. Image reprojection

  2. Image segmentation

  3. Image classification

  4. Image enhancement
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Image reprojection involves converting an image from one coordinate system to another, such as from geographic coordinates to projected coordinates, to ensure accurate spatial referencing.

Multiple choice

Which type of image processing technique is used to extract the boundaries of objects in an image?

  1. Edge detection

  2. Image segmentation

  3. Image classification

  4. Image enhancement
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Image segmentation involves dividing an image into multiple segments or regions based on similarities in pixel values, texture, or other characteristics, making it useful for object detection and boundary extraction.

Multiple choice

What is the term used to describe the process of combining multiple remotely sensed images of the same area taken at different times?

  1. Mosaicking

  2. Warping

  3. Resampling

  4. Georeferencing
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mosaicking is the process of combining multiple remotely sensed images of the same area taken at different times to create a single, seamless image.

Multiple choice

What is the term used to describe the process of adjusting the spatial resolution of remotely sensed imagery to match the resolution of other geospatial data?

  1. Georeferencing

  2. Mosaicking

  3. Warping

  4. Resampling
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Resampling is the process of adjusting the spatial resolution of remotely sensed imagery to match the resolution of other geospatial data, ensuring alignment and compatibility.

Multiple choice

Which technique is commonly used to reduce noise in motion capture data?

  1. Smoothing

  2. Filtering

  3. Interpolation

  4. Extrapolation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Filtering is a common technique used to reduce noise in motion capture data. Filters can be applied to the raw data to remove unwanted noise while preserving important motion details.

Multiple choice

What is the process of adjusting the colors in a video to improve their appearance called?

  1. Video editing

  2. Color correction

  3. Special effects

  4. Animation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Color correction is the process of adjusting the colors in a video to improve their appearance, such as by correcting for color casts or adjusting the overall color balance.

Multiple choice

What is the term for the software used to correct the colors in a video?

  1. Video editor

  2. Color corrector

  3. Special effects software

  4. Animation software
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A color corrector is a software program used to correct the colors in a video, allowing users to adjust the overall color balance, remove color casts, and apply color effects.

Multiple choice

What is the term for the process of removing unwanted objects or elements from a video?

  1. Rotoscoping

  2. Keying

  3. Tracking

  4. Stabilization
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Rotoscoping is the process of removing unwanted objects or elements from a video by manually tracing around them frame by frame.

Multiple choice

Which of the following is NOT a common post-processing effect?

  1. Motion blur

  2. Anti-aliasing

  3. Tessellation

  4. High dynamic range (HDR)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Tessellation is a technique used to increase the detail of a mesh by dividing it into smaller triangles. It is not a post-processing effect.

Multiple choice

Which of the following is NOT a type of texture mapping technique?

  1. Bump mapping

  2. Normal mapping

  3. Parallax mapping

  4. Mipmapping
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Mipmapping is a technique for reducing the size of textures in order to improve performance, while bump mapping, normal mapping, and parallax mapping are all techniques for adding detail and realism to textures.

Multiple choice

Which of the following is NOT a type of anti-aliasing technique?

  1. Multisampling

  2. Supersampling

  3. Temporal anti-aliasing

  4. Anisotropic filtering
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Anisotropic filtering is a technique for improving the quality of textures at oblique angles, while multisampling, supersampling, and temporal anti-aliasing are all techniques for reducing jagged edges on objects.

Multiple choice

Which of the following is a commonly used anti-aliasing technique?

  1. Supersampling

  2. Mipmapping

  3. Z-buffering

  4. Dithering
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Supersampling is a technique that involves rendering an image at a higher resolution than the display resolution and then downsampling it to the display resolution, resulting in smoother edges.