Detecting and correcting video defects to improve image quality of older recordings in the Montreux Jazz Festival digital archive.
To make the Montreux Jazz Festival archive viewable by future audiences, several tools were developed for the automatic detection and correction of video defects in the Montreux Jazz Festival archive. The primary archive remains untouched; the algorithms are only used on the secondary archive.
Origins of video defects :
- Defects that appeared over the years on the original analogue tapes due to natural deterioration.
- Defects that occurred due to wrongly configured playback equipment.
- Defects that occured at recording for reasons such as faulty camera, interference, image cuts etc.
- Defects that appeared on digitized video due to faulty selection of encoding parameters.
Depending on the characteristics of the defect, detection solutions can be applied based on the spatial analysis of the image or on a frequency-domain transform analysis. Filtering is then be applied to such domains for the removal of a perceptual defect.
Three tools were developed at MMSPG to detect and correct defects which had the greatest impact on overall image quality and viewer experience.
Defect types which require correction :
- Dropouts – points or lines which rapidly appear and disappear on an image.
- Lines – visible on the image and can vary in colour, thickness, direction, quantity and position.
- Logos – superimposed from TV channels onto the image and can appear periodically on concerts.
An academic paper was published on this subject. Please visit our conferences page for more information.
MMSPG (Multimedia Signal Processing Group)