Abstract: A system may include one or more camera modules each containing one or more image sensors. The system may be configured to capture images from light spectra outside the visible band. Therefore, the pixel integration times, and frame rates of the one or more image sensors may be unique and distinct. An image sensor may respond to a trigger control signal by beginning integration of a subset of pixels some duration after an appropriate trigger control signal transitions from low to high. The image sensor may output the frame captured by the pixels a predetermined duration after the trigger control signal transitions, to ensure a deterministic response. Pixels used to generate the image of a subsequent frame may begin integrating during the readout of the current frame. The pixels may be integrated for exactly their programmed integration time, even when the frame rate is varied.

Abstract: A system may include one or more camera modules each containing one or more image sensors. The system may be configured to capture images from light spectra outside the visible band. Therefore, the pixel integration times, and frame rates of the one or more image sensors may be unique and distinct. An image sensor may respond to a trigger control signal by beginning integration of a subset of pixels some duration after an appropriate trigger control signal transitions from low to high. The image sensor may output the frame captured by the pixels a predetermined duration after the trigger control signal transitions, to ensure a deterministic response. Pixels used to generate the image of a subsequent frame may begin integrating during the readout of the current frame. The pixels may be integrated for exactly their programmed integration time, even when the frame rate is varied.

Abstract: Common electronic devices having imaging systems that use a rolling shutter scheme suffer from flicker due to the oscillating brightness of an illuminating light source. Some imaging systems use fast frame rates that result in less than two cycles of the illuminating light source occurring during a single frame capture. For devices that employ rolling shutter schemes and fast frame rates, a method of data collection and processing is provided that utilizes a combination of multiple sets of more than two image data frames to automatically detect flicker. Measured patterns of energy differences between various image frames and a reference image frame may be compared with an expected pattern of energy differences to determine a probability of flicker detection due to a given flicker frequency. This probability of flicker detection may be used to activate flicker avoidance procedures in an electronic device.

Abstract: Common electronic devices having imaging systems that use a rolling shutter scheme suffer from flicker due to the oscillating brightness of an illuminating light source. Some imaging systems use fast frame rates that result in less than two cycles of the illuminating light source occurring during a single frame capture. For devices that employ rolling shutter schemes and fast frame rates, a method of data collection and processing is provided that utilizes a combination of multiple sets of more than two image data frames to automatically detect flicker. Measured patterns of energy differences between various image frames and a reference image frame may be compared with an expected pattern of energy differences to determine a probability of flicker detection due to a given flicker frequency. This probability of flicker detection may be used to activate flicker avoidance procedures in an electronic device.