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 is a common image processing technique used to segment medical images?

  1. Region growing

  2. Thresholding

  3. Clustering

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

Region growing is a common image processing technique used to segment medical images.

Multiple choice

Which of the following is a common method for measuring the surface roughness of optical components?

  1. Interferometry

  2. Scatterometry

  3. Profilometry

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

Profilometry is a technique used to measure the surface roughness of optical components by scanning a stylus or light beam across the surface and recording the variations in height.

Multiple choice

Which technique is commonly used to achieve a smooth and reflective surface on an optical component?

  1. Polishing

  2. Coating

  3. Annealing

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

Polishing is a process used to achieve a smooth and reflective surface on an optical component by removing microscopic irregularities and defects.

Multiple choice

Which of the following is not a common type of conservation treatment used for photographs?

  1. Inpainting

  2. Spotting

  3. Fading reduction

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

Laminating is not a common type of conservation treatment used for photographs, as it can cause damage to the photograph and make it difficult to access the photograph for future repairs.

Multiple choice

Which editing technique is commonly used to enhance the colors and vibrancy of food in photographs?

  1. Color correction

  2. Color grading

  3. White balance adjustment

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

Color grading is a post-processing technique used to manipulate the colors in an image to achieve a specific mood, style, or to enhance the overall visual appeal.

Multiple choice

Which post-processing technique is commonly used to add a vintage or retro look to food photographs?

  1. Cross-processing

  2. Desaturation

  3. Vignette

  4. Film grain emulation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Film grain emulation is a post-processing technique that adds a grainy texture to digital images, giving them the appearance of being shot on film, often resulting in a vintage or retro aesthetic.

Multiple choice

What is the term for the technology that allows for the capture of high-dynamic-range (HDR) images in film?

  1. Logarithmic encoding

  2. Wide color gamut

  3. HDRI lighting

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

Logarithmic encoding is a technique used in HDR imaging to capture a wider range of brightness levels than traditional linear encoding.

Multiple choice

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

  1. Bump mapping

  2. Normal mapping

  3. Parallax mapping

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

Phong shading is a shading technique used to calculate the intensity of light reflected from a surface, whereas bump mapping, normal mapping, and parallax mapping are all texture mapping techniques.

Multiple choice

Which of the following is NOT a common texture filtering technique?

  1. Bilinear filtering

  2. Trilinear filtering

  3. Anisotropic filtering

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

Mipmapping is a technique used to reduce the amount of texture memory required by storing multiple versions of the same texture at different resolutions, whereas bilinear filtering, trilinear filtering, and anisotropic filtering are all texture filtering techniques.

Multiple choice

Which of the following is NOT a common texture compression algorithm?

  1. JPEG

  2. PNG

  3. DDS

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

PNG is a lossless image compression algorithm, whereas JPEG, DDS, and ETC are all lossy texture compression algorithms commonly used in game graphics.

Multiple choice

Which of the following is NOT a common texture mapping coordinate system?

  1. UV mapping

  2. Spherical mapping

  3. Cylindrical mapping

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

Planar mapping is not a common texture mapping coordinate system, as it is typically used for mapping textures onto 2D surfaces, whereas UV mapping, spherical mapping, and cylindrical mapping are all commonly used for mapping textures onto 3D models.

Multiple choice

Which of the following is NOT a common technique used to reduce the computational cost of texture mapping?

  1. Mipmapping

  2. Texture filtering

  3. Texture compression

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

Procedural textures are not a common technique used to reduce the computational cost of texture mapping, as they are typically more computationally expensive than pre-made textures.

Multiple choice

What is the primary advantage of using trilinear filtering over bilinear filtering in texture mapping?

  1. Trilinear filtering produces higher quality textures

  2. Trilinear filtering is more computationally efficient

  3. Trilinear filtering reduces texture aliasing

  4. Trilinear filtering requires less texture memory
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Trilinear filtering reduces texture aliasing by interpolating between the four nearest texels, resulting in smoother transitions between textures.

Multiple choice

Which of the following is NOT a common type of anisotropic filtering in texture mapping?

  1. 2x anisotropic filtering

  2. 4x anisotropic filtering

  3. 8x anisotropic filtering

  4. 16x anisotropic filtering
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

16x anisotropic filtering is not a common type of anisotropic filtering in texture mapping, as it is rarely used due to its high computational cost.

Multiple choice

What is the difference between color grading and color correction?

  1. Color grading is the process of adjusting the colors of the footage to match the director's vision

  2. Color correction is the process of fixing any color problems caused by the camera or lighting

  3. Color grading is a more creative process, while color correction is a more technical process

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

Color grading is the process of adjusting the colors of the footage to match the director's vision, while color correction is the process of fixing any color problems caused by the camera or lighting. Color grading is a more creative process, while color correction is a more technical process.