Global Intensity Correction in Dynamic Scenes
International Journal of Computer Vision
Weighted prediction methods for improved motion compensation
ICIP'09 Proceedings of the 16th IEEE international conference on Image processing
Chromatic sensitivity of illumination change compensation techniques
ISVC'10 Proceedings of the 6th international conference on Advances in visual computing - Volume Part I
Motion compensation based on tangent distance prediction for video compression
Image Communication
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A global brightness-variation compensation (GBC) scheme is proposed to improve the coding efficiency for video scenes that contain global brightness-variations caused by fade in/out, camera-iris adjustment, flicker, illumination change, and so on. In this scheme, a set of two brightness-variation parameters, which represent multiplier and offset components of the brightness-variation in the whole frame, is estimated. The brightness-variation is then compensated using the parameters. We also propose a method to apply the GBC scheme to component signals for video coding. Furthermore, a block-by-block on/off control method for GBC is introduced to improve the coding performance even for scenes including local variations in brightness caused by camera flashes, spotlights, and the like. Simulation results show that the proposed GBC scheme with the on/off control method improves the peak signal-to-noise ratio (PSNR) by 2-4 dB when the coded scenes contain brightness-variations