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

Which of the following is NOT a common noise reduction technique used in underwater image editing?

  1. Using a noise reduction filter

  2. Applying a median filter

  3. Increasing the overall sharpness of the image

  4. Using a high-pass filter
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Increasing the overall sharpness of the image is not a noise reduction technique. It is a technique used to enhance the definition and detail of the image. Noise reduction techniques, on the other hand, are used to remove or reduce unwanted noise and grain from the image.

Multiple choice

Which of the following is NOT a common technique for removing unwanted reflections from the water surface in underwater images?

  1. Using a polarizing filter

  2. Applying a graduated filter

  3. Cloning or stamping out the reflections

  4. Using a content-aware fill tool
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Applying a graduated filter is not a common technique for removing unwanted reflections from the water surface in underwater images. Graduated filters are typically used to adjust the brightness and contrast of different parts of the image, not to remove specific objects or reflections.

Multiple choice

Which of the following is NOT a common technique for enhancing the underwater images?

  1. Color correction

  2. White balance adjustment

  3. Contrast adjustment

  4. Noise reduction

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

Sharpening is not a common technique for enhancing underwater images. Underwater images often have a soft and hazy appearance due to the scattering of light in water. Sharpening can accentuate this haziness and make the image look unnatural.

Multiple choice

Which of the following is NOT a common tool used for underwater image editing?

  1. Curves

  2. Levels

  3. Hue/Saturation

  4. Spot Healing Brush

  5. Clone Stamp
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Spot Healing Brush is not a common tool used for underwater image editing. It is primarily used for removing small blemishes and imperfections from an image, which is not a common task in underwater image editing.

Multiple choice

Which of the following is NOT a common technique for removing backscatter from underwater images?

  1. Using a polarizing filter

  2. Applying a graduated filter

  3. Cloning or stamping out the backscatter

  4. Using a content-aware fill tool
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Using a polarizing filter is not a common technique for removing backscatter from underwater images. Polarizing filters are primarily used to reduce glare and reflections from non-metallic surfaces, which is not the case with backscatter.

Multiple choice

Which of the following is NOT a common editing technique used in street photography?

  1. Cropping

  2. Adjusting exposure

  3. Adjusting contrast

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

Adding filters is not a common editing technique used in street photography, as street photography typically focuses on capturing the essence and emotions of a particular moment in a candid and spontaneous manner.

Multiple choice

Which of these is a common editing technique used in food photography?

  1. Color correction

  2. Cropping and resizing

  3. Sharpening

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

Color correction, cropping and resizing, and sharpening are common editing techniques used in food photography to enhance the visual appeal and quality of the images.

Multiple choice

In radiography, what is the term used to describe the degree of darkness or lightness in an image?

  1. Contrast

  2. Density

  3. Resolution

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

Density in radiography refers to the degree of darkness or lightness in an image. It is determined by the amount of radiation absorbed by the tissues and structures being imaged.

Multiple choice

What is the term used to describe the process of removing unwanted structures or tissues from an image during image processing?

  1. Segmentation

  2. Reconstruction

  3. Filtering

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

Segmentation in animal radiology refers to the process of removing unwanted structures or tissues from an image during image processing. This helps in isolating and analyzing specific regions of interest.

Multiple choice

What is the term used to describe the process of adjusting the brightness and contrast of an image to optimize its diagnostic value?

  1. Windowing

  2. Leveling

  3. Segmentation

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

Windowing in animal radiology refers to the process of adjusting the brightness and contrast of an image to optimize its diagnostic value. It allows veterinarians to visualize specific structures and tissues more clearly.

Multiple choice

Which chemical etching technique is commonly used for surface modification in microelectronics?

  1. Anisotropic etching

  2. Isotropic etching

  3. Reactive ion etching

  4. Deep reactive ion etching
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Anisotropic etching is a chemical etching technique that produces anisotropic (direction-dependent) etching, resulting in well-defined and controlled surface features.

Multiple choice

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

  1. Adjusting the white balance

  2. Adjusting the contrast

  3. Adjusting the saturation

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

Applying a vignette is not a common post-processing technique used in desert safari photography, as it can darken the edges of the image and make it look less appealing.

Multiple choice

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

  1. Adjusting exposure and contrast

  2. Cropping and resizing the image

  3. Applying filters and effects

  4. Adding watermarks or logos
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Adding watermarks or logos is not a common post-processing technique used in wildlife photography, as it is generally considered unprofessional and distracting. The other options, such as adjusting exposure and contrast, cropping and resizing the image, and applying filters and effects, are all common post-processing techniques used to enhance the visual appeal of wildlife images.

Multiple choice

What is the process of correcting geometric distortions in remotely sensed images called?

  1. Image enhancement

  2. Image classification

  3. Image rectification

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

Image rectification involves geometrically correcting remotely sensed images to remove distortions caused by factors such as sensor geometry and Earth's curvature.

Multiple choice

Which type of data processing technique is commonly used to enhance the visual appearance of remotely sensed images?

  1. Image enhancement

  2. Image classification

  3. Image rectification

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

Image enhancement techniques are applied to remotely sensed images to improve their visual appearance, making them easier to interpret and analyze.