An image correction apparatus calculates a feature value indicative of an average brightness of an input image from the pixel values of the input image and determines a pixel value at a boundary for correcting each pixel of the input image to make it brighter or darker by using the calculated feature value of the input image. The audible and visual indicators of the transmitter are triggered at the rate of the current pulses drawn from the AC line. Systems and methods are provided to enable, among other things, KPI definition, storage, identification of defined or available KPIs, and interaction with the KPIs. Responsive to the event being a result of the cognitive state of the person, an indication of the cognitive state of the person being below a threshold level of cognitive abilities is generated. In the step, conversion discharge is caused in a conversion period after the scan period, thereby decreasing the amount of the wall charge in the pixels. The ion drive includes a substrate with channels therethrough, a conductive material coating on the bottom and top of the substrate, a top electrical lead connected to the conductive material coating covering the top of the substrate, and a bottom electrical lead connected to the conductive material coating covering the bottom of the substrate.