Active Lighting for Video Conferencing

Intra-and-Inter-Constraint-Based Video Enhancement Based on Piecewise Tone Mapping

“…However, this method relies on the performance of shot detector and fails to suitably enhance the inter-frame quality within a shot. Furthermore, Sun et al [1] use additional hardware to compensate for the lighting condition for keeping consistency. Since this method has specific system requirements, it cannot be easily applied in other applications.…”

“…Furthermore, as mentioned, most existing works [1][2][3][4][5][6][7][8][9][10] cannot effectively handle the inter-frame consistencies in a video. Although these methods may achieve proper visual qualities in each frame, the qualities among different frames (i.e., inter-frame qualities) may vary.…”

“…However, it should be noted that the idea of our algorithm is general and it can be extended to other enhancement algorithms [1,[7][8][9][10]. Furthermore, in order to make the description clear, in the rest of the paper, we will use boldface to represent vectors (i.e., color histograms) and use unboldface to represent scalars and functions.…”

“…(1). Instead of using the histogram distribution to construct the tone mapping function directly, the method formulated a weighted sum of two objectives as:…”

“…ideo services are of increasing importance in many areas including communications, entertainment, healthcare, and surveillance [1,4,[8][9][10]. However, in many applications, the quality of video service is still hindered by several technical limitations such as poor lightening conditions, bad exposure level, and unpleasant skin color tone [8][9].…”