Computer Knowledge

Digital Image Processing

2,042 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

Which image processing technique is used to create a binary image from a grayscale image?

  1. Thresholding

  2. Edge detection

  3. Color correction

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

Thresholding is a technique used to create a binary image from a grayscale image. It involves setting all pixel values below a certain threshold to black and all pixel values above the threshold to white.

Multiple choice

What is the process of combining multiple images into a single composite image called?

  1. Image stitching

  2. Segmentation

  3. Edge detection

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

Image stitching is the process of combining multiple images into a single composite image. This is often done to create panoramic images or to extend the field of view beyond the limitations of a single camera.

Multiple choice

What is the most common stitching method used for panoramic images?

  1. Linear blending

  2. Cylindrical blending

  3. Spherical blending

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

The most common stitching method used for panoramic images is linear blending, which is a simple and straightforward way to blend the edges of multiple images together.

Multiple choice

Which of the following is NOT a common type of perspective correction?

  1. Vertical perspective correction

  2. Horizontal perspective correction

  3. Radial perspective correction

  4. Curvilinear perspective correction
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Radial perspective correction is not a common type of perspective correction. Vertical, horizontal, and curvilinear perspective corrections are more commonly used to adjust the angle of lines and objects in an image.

Multiple choice

Which of the following is NOT a common type of grid overlay used for straightening and perspective correction?

  1. Rule of thirds grid

  2. Golden ratio grid

  3. Square grid

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

Curved grids are not commonly used for straightening and perspective correction. Rule of thirds grid, Golden ratio grid, and Square grid are more commonly used to help align elements in the image and adjust the composition.

Multiple choice

What is the most common method of color correction used in printing?

  1. ICC profiling

  2. Spot color matching

  3. Manual color correction

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

ICC profiling is the most common method of color correction used in printing, as it allows for accurate color reproduction by creating a profile that characterizes the color capabilities of a specific printing device.

Multiple choice

What is the role of a RIP (Raster Image Processor) in color correction?

  1. To convert digital image data into a format suitable for printing.

  2. To apply color correction profiles to the image data.

  3. To generate halftone screens for printing.

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A RIP (Raster Image Processor) plays a crucial role in color correction by converting digital image data into a format suitable for printing, applying color correction profiles to the image data to ensure accurate color reproduction, and generating halftone screens for printing, which helps to create the illusion of continuous tones using a limited number of inks.

Multiple choice

Which color correction technique involves adjusting the overall brightness and darkness of an image?

  1. White balance

  2. Exposure

  3. Contrast

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

Exposure adjustment controls the overall brightness of an image by increasing or decreasing the amount of light captured by the camera sensor.

Multiple choice

Which color correction technique involves adjusting the intensity of colors in an image?

  1. Contrast

  2. Saturation

  3. Hue

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

Saturation adjustment controls the intensity of colors in an image, making them appear more or less vivid.

Multiple choice

Which color correction technique involves adjusting the overall color tone of an image?

  1. White balance

  2. Hue

  3. Temperature

  4. Tint
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Temperature adjustment controls the overall color tone of an image, making it appear warmer or cooler by shifting the colors towards yellow or blue, respectively.

Multiple choice

Which color correction technique involves adjusting the color balance of an image?

  1. Color grading

  2. White balance

  3. Color correction

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

Color grading is a comprehensive color correction technique that involves adjusting the overall color balance, contrast, saturation, and other elements to create a specific visual style or mood.

Multiple choice

Which color correction technique involves adjusting the color temperature of an image?

  1. White balance

  2. Temperature

  3. Tint

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

Temperature adjustment allows you to control the overall color temperature of an image, making it appear warmer or cooler by shifting the colors towards yellow or blue, respectively.

Multiple choice

In data compression, what is the trade-off between compression ratio and reconstruction quality?

  1. Higher compression ratio leads to better reconstruction quality

  2. Higher compression ratio leads to worse reconstruction quality

  3. Compression ratio has no impact on reconstruction quality

  4. Reconstruction quality is independent of compression ratio
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In data compression, there is a trade-off between compression ratio and reconstruction quality. Higher compression ratios generally lead to worse reconstruction quality due to the loss of information during compression.

Multiple choice

What are some of the techniques used in film restoration?

  1. Digital restoration

  2. Photochemical restoration

  3. Color correction

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Film restoration involves a combination of techniques, including digital restoration, photochemical restoration, and color correction. Digital restoration involves using digital technology to clean and repair the film, while photochemical restoration involves using traditional film techniques to restore the film. Color correction is used to adjust the colors in the film to make them more accurate.

Multiple choice

Which matting technique involves using a trimap to define the foreground, background, and unknown regions of an image?

  1. Alpha Matting

  2. Chroma Keying

  3. Color Matting

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

Bayesian Matting utilizes a trimap to represent the different regions of an image and applies statistical methods to estimate the alpha matte.