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Excitation-Scanning Hyperspectral Imaging Microscopy to Efficiently Discriminate Fluorescence Signals
Published on: August 22, 2019
Color changes in electronic endoscopic images caused by image compression
O Katayama1, S Ishihama, K Namiki
1Clinical Laboratory Saitamaken-Saiseikai Kurihashi Hospital Saitama 349-11 Japan.
Diagnostic and Therapeutic Endoscopy
|January 1, 1997
Summary
Image compression in endoscopy affects color accuracy. Increased JPEG compression significantly alters blue color information more than red or green in electronic endoscopic images.
Area of Science:
- Medical Imaging
- Digital Image Processing
- Endoscopy
Background:
- Magneto-optical disks are used for recording electronic endoscopic images.
- Image compression, such as Joint Photographic Image Coding Experts Group (JPEG), is employed to reduce data volume and costs.
- Understanding the impact of compression on image quality is crucial for diagnostic accuracy.
Purpose of the Study:
- To investigate the relationship between varying degrees of JPEG compression and the color information in electronic endoscopic images.
- To quantify color changes in red, green, and blue channels under different compression levels.
Main Methods:
- Eight electronic endoscopic images were recorded onto magneto-optical disks using four JPEG compression modes (none, weak, moderate, strong).
- Images were processed offline, and 10 regions of interest (ROIs) were analyzed.
- Histograms were generated to measure mean densities of red (R), green (G), and blue (B) channels within each ROI.
Main Results:
- Increased compression levels led to greater alterations in color information.
- The blue (B) channel exhibited more significant color changes compared to red (R) and green (G) channels, particularly at higher compression levels.
- Color shifts were more pronounced in regions with lower initial color density.
Conclusions:
- The degree of JPEG image compression directly impacts the color fidelity of electronic endoscopic images.
- Blue color information is most susceptible to degradation from compression artifacts.
- Careful consideration of compression settings is necessary to maintain diagnostic quality in endoscopic imaging.
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