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CMOS-based microelectronic sensors have great potential in the development of biosensors for medical and life science applications. Validating these lab-on-CMOS systems is a challenging task due to the difficulties in obtaining simultaneous ground-truth imaging and sensor data. In this work, we report a real-time imaging platform that generates high-quality images of lab-on-CMOS systems within cell culture environments. The platform was used to validate a CMOS capacitance sensor that monitors cell viability, proliferation, and death. In vitro experiments were performed with human ovarian cancer cell lines, in which time-lapse images and capacitance recordings were acquired simultaneously over three days. The images corroborate the temporal changes in capacitance recordings as the cells proliferate, and unambiguously confirm the sensor's ability to detect single-cell binding events, track cell morphology …