Simultaneous luminance and position stabilization for film and video

The Correction of Intensity Flicker in Archived Film

“…Van Roosmalen in 1999 who originate an idea based on estimating two flicker parameters that could be used for flicker correction [1] , but the drawback of this method is that it can not accurately detect the motion regions thus leading to inaccurate flicker correction in these motion regions. Some flicker correction algorithms did not take the inaccurate parameters estimation caused by local motion into account [2,3,4] . The methods suggested in [5], [6] somehow estimated the parameters in motion regions, however, they can be improved both at accuracy of detection and the efficiency.A method based on the cosine basis and the successive over-relaxation is developed in [7], but it is not unfeasible for the computational cost is high.…”

Diagnosis and treatment of film tear in degraded archived media

“…However the quality of archived material often does not match the high standards of quality demanded by digital media due to degradation of the film. The most common forms of degradation include intensity fluctuations in the film (known as flicker [4]) and presence of dirt and sparkle (also called blotches [3]) on the film. Another common form of film degradation is film tear which is caused by the physical ripping of the film.…”

Localised deflicker of moving images

“…There is thus a trade-o between the amount of de icker that can be handled and the propagation of errors in the restored sequence. The key solution to icker compensation is actually to consider the problem as a ltering problem [2,5]. Instead of locking the brightness to the previous frame, it should be sought to average the brightness levels between the current frame and its past and future neighbouring frames.…”

“…Drawing from previous works [2,5], the icker compensation is done here by ltering the icker parameters.…”

“…Ideally the mapping t should be estimated at every pixel site but this would require too much computation. Since the icker artefact is spatially smooth, the solution adopted in the literature is to interpolate the mapping using 2D polynomial [7,4], cosine [2] or spline [5] functions. Using splines for instance yields the following interpolation [5]:…”