JAJSF42B April 2018 – June 2019 DLPC3478
Local area brightness boost (LABB), is an image processing algorithm that adaptively gains up regions of an image that are dim relative to the average picture level. Some regions of the image have significant gain applied, and some regions have little or no gain applied. LABB evaluates images frame by frame and derives the local area gains to be used uniquely for each image. Because many images have a net overall boost in gain even if some areas of the image get no gain, the overall perceived brightness of the image is boosted.
Figure 27 shows a split screen example of the impact of the LABB algorithm for an image that includes dark areas.
LABB works best when the decision about the strength of gains used is determined by ambient light conditions. For this reason, there is an option to add an ambient light sensor which can be read by the DLPC3478 device during each frame. Based on the sensor readings, LABB applies higher gains for bright rooms to help overcome any washing out of images. LABB applies lower gains in dark rooms to prevent over-punching of images.