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
What is the term used to describe the process of removing unwanted artifacts and imperfections from an alpha matte?
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Matte cleanup
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Matte refinement
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Matte optimization
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Matte correction
A
Correct answer
Explanation
Matte cleanup is the process of removing unwanted artifacts and imperfections from an alpha matte, such as stray pixels or color fringing, to ensure a clean and seamless composite.
What is the term used to describe the process of using an alpha matte to isolate a specific object or region in an image?
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Object isolation
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Region selection
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Image masking
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Foreground extraction
A
Correct answer
Explanation
Object isolation is the process of using an alpha matte to isolate a specific object or region in an image, allowing for its manipulation or removal from the background.
Which of the following techniques can be used to create a realistic shadow for a composited object using alpha matting?
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Drop shadow
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Gaussian blur
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Color correction
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Motion blur
A
Correct answer
Explanation
Drop shadow is a technique used to create a realistic shadow for a composited object using alpha matting, simulating the natural shadow cast by the object in the scene.
What is the term used to describe the process of combining multiple alpha mattes to create a composite image with multiple layers?
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Layer compositing
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Image stacking
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Matte merging
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Channel blending
A
Correct answer
Explanation
Layer compositing is the process of combining multiple alpha mattes to create a composite image with multiple layers, allowing for the creation of complex and visually appealing compositions.
Which source coding technique is commonly used for compressing images and videos?
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Huffman Coding
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Shannon-Fano Coding
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Lempel-Ziv Coding
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Wavelet Coding
D
Correct answer
Explanation
Wavelet Coding is a powerful source coding technique specifically designed for compressing images and videos. It utilizes wavelet transforms to decompose the data into different frequency bands, enabling efficient compression by exploiting the spatial and spectral characteristics of the data.
What is the term used to describe the process of adjusting the brightness and contrast of an image?
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Exposure
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White balance
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Color correction
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Sharpening
A
Correct answer
Explanation
Exposure refers to the amount of light that reaches the camera's sensor. Adjusting the exposure allows you to control the brightness and contrast of an image.
Which of the following is a type of color filter used in photography?
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Neutral density filter
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Polarizing filter
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Graduated neutral density filter
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All of the above
D
Correct answer
Explanation
Neutral density filters, polarizing filters, and graduated neutral density filters are all types of color filters that are used in photography to achieve specific effects.
What is the term used to describe the process of adjusting the color temperature of an image to match a specific light source?
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White balance
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Color correction
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Color grading
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Color calibration
A
Correct answer
Explanation
White balance is the process of adjusting the color temperature of an image to match a specific light source. This ensures that white objects appear white in the image.
Which of the following is a type of color correction tool used in image editing software?
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Hue/Saturation
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Levels
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Curves
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All of the above
D
Correct answer
Explanation
Hue/Saturation, Levels, and Curves are all types of color correction tools that are used in image editing software to adjust the colors in an image.
Which of the following is NOT a common color correction technique used in architecture photography?
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White balance adjustment
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Exposure compensation
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Color grading
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Desaturation
D
Correct answer
Explanation
Desaturation is not a common color correction technique used in architecture photography. Instead, techniques such as white balance adjustment, exposure compensation, and color grading are more commonly used to enhance the colors in architectural images.
Which of the following is NOT a common perspective correction technique used in architecture photography?
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Lens correction
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Keystone correction
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Straightening horizon lines
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Adjusting vanishing points
D
Correct answer
Explanation
Adjusting vanishing points is not a common perspective correction technique used in architecture photography. Instead, techniques such as lens correction, keystone correction, and straightening horizon lines are more commonly used to correct perspective distortions in architectural images.
Which of the following is NOT a common sharpening technique used in architecture photography?
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Unsharp mask
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High pass filter
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Median filter
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Gaussian blur
C
Correct answer
Explanation
Median filter is not a common sharpening technique used in architecture photography. Instead, techniques such as unsharp mask, high pass filter, and Gaussian blur are more commonly used to enhance the sharpness of architectural images.
Which of the following is NOT a common technique for adding texture to architectural images?
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Overlaying textures
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Using a grunge brush
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Adding noise
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Applying a high pass filter
D
Correct answer
Explanation
Applying a high pass filter is not a common technique for adding texture to architectural images. Instead, techniques such as overlaying textures, using a grunge brush, and adding noise are more commonly used to create a textured effect in architectural images.
Which of the following is NOT a common technique for converting color images to black and white in architecture photography?
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Using a black and white conversion filter
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Desaturating the image
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Using a channel mixer
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Applying a high pass filter
D
Correct answer
Explanation
Applying a high pass filter is not a common technique for converting color images to black and white in architecture photography. Instead, techniques such as using a black and white conversion filter, desaturating the image, and using a channel mixer are more commonly used to achieve a black and white effect.
Which of the following is not a common HDR tone mapping algorithm?
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Linear Tone Mapping
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Reinhard Tone Mapping
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Histogram Equalization
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Adaptive Logarithmic Tone Mapping
C
Correct answer
Explanation
Histogram Equalization is not a specific tone mapping algorithm used in HDR photography. It is a technique for adjusting the distribution of pixel values in an image to improve contrast.