image modifications Flashcards
Compression
affected by?
– affects image file size in memory storage
- useful for storage issues eg. “zipping” files
- actual file size is larger that stored file size
- compression is an algorithm tha can shrink thefile size for storage and recreate the data when retrieving the data
•File memory size can become quiet largedue to
– size of grid (sensor size)
- number of images
- bit depth
types of image manipulation
➢ Edge Enhancement – sharpening filter
➢ Noise Reduction – softening filter
➢ Optimization of density/contrast
➢ Inversion of gray scale
➢ Magnification
➢ Emboss function
➢ Pseudocolor enhancement
what manipulation is this
grey scale inversion
what adjustment was made here
adjustment contrast/brightness
what is the issue with this x ray, how can it be fixed?
overrexposure, density optimization
how was this image changed
decreased contrast
how was this image changed
edge enhancement/ sharpening
how was this altered
noise reduction/ softened
noise reduction?
Remove high-frequency noise
May degrade or remove important diagnostic information
edge sharpening
Remove low-frequency noise; increases image contrast
Exaggerate the contrast difference between adjacent pixels; to increase contrast, all pixel values are stretched; the dark shades become darker and the light shades become lighter
Enhances local contrast and makes edges sharper to diagnose caries, restoration fit, and fractures
simulates disease; crown/ restoration failure
emboss function
Applies a three dimensional effect to the image
Could be useful in presentation situations
automated image analysis tools
•Length (in MiPACS viewer)
•Angles
•Bone Density
•Area
•Circumference
• Image reconstruction
Data is utilized by other software programs and produces different image presentations
creates a 3D image from planes of data
what do these mean
