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 of the following closed-form matting algorithms is known for its ability to handle images with large variations in illumination?

  1. Bayesian Matting

  2. Poisson Matting

  3. Closed-Form Matting

  4. Random Walk Matting
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bayesian Matting is capable of handling images with large variations in illumination. It utilizes a probabilistic framework that allows for the incorporation of illumination models, enabling it to estimate the alpha matte accurately even in challenging lighting conditions.

Multiple choice

What is the primary limitation of closed-form matting algorithms in general?

  1. They can only handle images with simple backgrounds.

  2. They are sensitive to noise in the image.

  3. They require user interaction to provide a trimap.

  4. They are computationally expensive.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Closed-form matting algorithms generally assume that the background is locally smooth and that there is a clear separation between the foreground and background. They may struggle to produce accurate alpha mattes for images with complex or textured backgrounds.

Multiple choice

What is the term used to describe the process of adjusting the exposure and color of multiple photos to match each other before stitching?

  1. Exposure blending

  2. Color correction

  3. White balance adjustment

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

Exposure blending is the term used to describe the process of adjusting the exposure and color of multiple photos to match each other before stitching.

Multiple choice

What is the term used to describe a point on a panoramic image that, when clicked, provides additional information or allows the viewer to navigate to another part of the tour?

  1. Hotspot

  2. Link

  3. Button

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

Hotspot is the term used to describe a point on a panoramic image that, when clicked, provides additional information or allows the viewer to navigate to another part of the tour.

Multiple choice

Which technique is commonly used to stabilize the image of a film that has experienced shrinkage or warping?

  1. Film flattening

  2. Film stretching

  3. Film shrinking

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

Film flattening involves applying heat and pressure to a film to remove wrinkles, creases, and other distortions, restoring its flatness and stability.

Multiple choice

What is the term used to describe the process of correcting color fading and stabilizing the image of a film?

  1. Film restoration

  2. Film digitization

  3. Film color correction

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

Film color correction involves adjusting the colors of a film to restore their original appearance or to achieve a desired aesthetic effect.

Multiple choice

Which of the following is NOT a common post-processing technique used in food photography?

  1. Color Correction

  2. Sharpening

  3. Noise Reduction

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

HDR (High Dynamic Range) Photography is not typically used in food photography as it can result in an unnatural look and loss of detail.

Multiple choice

What is the purpose of using the 'Curves' tool in post-processing?

  1. Adjusting the overall contrast and brightness

  2. Correcting the color balance

  3. Adding a vignette effect

  4. Sharpening the image
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The 'Curves' tool allows precise control over the tonal values of an image, enabling adjustments to the overall contrast and brightness.

Multiple choice

What is the technique of selectively adjusting the brightness and contrast of different areas of an image called?

  1. Dodging and Burning

  2. Color Grading

  3. Split Toning

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

Dodging and Burning involves lightening (dodging) or darkening (burning) specific areas of an image to create a more balanced and visually appealing composition.

Multiple choice

What is the technique of selectively adjusting the color of different areas of an image called?

  1. Color Correction

  2. Color Grading

  3. Split Toning

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

Color Grading involves selectively adjusting the color of different areas of an image to create a specific mood or atmosphere.

Multiple choice

Which of the following is NOT a common post-processing technique used to enhance the sharpness of an image?

  1. Sharpening

  2. Noise Reduction

  3. Lens Correction

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

HDR Photography is not a technique used to enhance the sharpness of an image but rather to create images with a wider dynamic range.

Multiple choice

Which of the following is a common post-processing step in Machine Translation?

  1. Smoothing

  2. Reordering

  3. Error correction

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

Smoothing, reordering, and error correction are common post-processing steps in Machine Translation. Smoothing involves adjusting the probabilities of word sequences to make the output more fluent, reordering involves rearranging the word order to match the target language's grammar, and error correction involves identifying and correcting errors in the Machine Translation output.

Multiple choice

Which of the following is NOT a common color correction technique in product photography?

  1. White balance adjustment

  2. Exposure adjustment

  3. Contrast adjustment

  4. Saturation adjustment

  5. Hue adjustment
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Hue adjustment is not commonly used in product photography as it changes the actual color of the product, which can be misleading to customers.

Multiple choice

Which of the following is NOT a common retouching technique in product photography?

  1. Blemish removal

  2. Wrinkle removal

  3. Dust and scratch removal

  4. Color correction

  5. Shape correction
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Color correction is not a retouching technique, but rather a color adjustment technique. Retouching techniques are used to remove or correct imperfections in the product image, such as blemishes, wrinkles, dust, and scratches.

Multiple choice

Which of the following is NOT a common technique used to sharpen product images in post-processing?

  1. Unsharp mask

  2. High pass filter

  3. Median filter

  4. Gaussian blur

  5. Smart sharpen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Median filter is not a sharpening technique, but rather a noise reduction technique. It is used to remove noise from an image by replacing each pixel with the median value of its neighboring pixels.