Digital Image Processing EXAM 2024/2025 questions and answers | verified
Matrix size = - Matrix size = M x N x k bits
Field of View (FOV) - - Overall dimensions of
the matrix.
- In CR and DR the size
of the FOV is
determined by the
size of the detector
pixel size= - FOV/matrix
What happens to pixel size as Matrix size increases (FOV stays the same) - As Matrix size gets
bigger, pixel size gets smaller (if FOV stays the same)
Bit Depth - - Number of shades of gray each pixel is capable of displaying
- M x N x k bits
- Each pixel =2k gray levels
- Increase bit depth = more shades of gray
Classes of Image Processing (5)? - 1. Image Enhancement
Goal: to generate a more diagnostic image;
sharpening
2. Image Restoration
Goal: to improve the quality of images that have
distortions or degradations.
3.) Image synthesis
, Goal: To crate a new image from other
images
4. Image Analysis
Goal: allows measurements and statistics to be
performed; extraction of meaningful information
(ie. ROI in CT; leg length measurements)
5. Image Compression
Lossless compression (reversible
compression)
Lossy compression (irreversible
compression)
The spatial location domain - Physical location of each pixel relative to the entire
image
The spatial frequency domain - The location of small structures (details) versus
the location of large structures (contrast)
in an image
how do you Switch domains? - The Fourier transform converts from one domain to the other.
explain what Image Pre-Processing: Dead pixel means? - • Pixels that don't
respond to
radiation at all
• Appear as small
white dots prior
Matrix size = - Matrix size = M x N x k bits
Field of View (FOV) - - Overall dimensions of
the matrix.
- In CR and DR the size
of the FOV is
determined by the
size of the detector
pixel size= - FOV/matrix
What happens to pixel size as Matrix size increases (FOV stays the same) - As Matrix size gets
bigger, pixel size gets smaller (if FOV stays the same)
Bit Depth - - Number of shades of gray each pixel is capable of displaying
- M x N x k bits
- Each pixel =2k gray levels
- Increase bit depth = more shades of gray
Classes of Image Processing (5)? - 1. Image Enhancement
Goal: to generate a more diagnostic image;
sharpening
2. Image Restoration
Goal: to improve the quality of images that have
distortions or degradations.
3.) Image synthesis
, Goal: To crate a new image from other
images
4. Image Analysis
Goal: allows measurements and statistics to be
performed; extraction of meaningful information
(ie. ROI in CT; leg length measurements)
5. Image Compression
Lossless compression (reversible
compression)
Lossy compression (irreversible
compression)
The spatial location domain - Physical location of each pixel relative to the entire
image
The spatial frequency domain - The location of small structures (details) versus
the location of large structures (contrast)
in an image
how do you Switch domains? - The Fourier transform converts from one domain to the other.
explain what Image Pre-Processing: Dead pixel means? - • Pixels that don't
respond to
radiation at all
• Appear as small
white dots prior
