A system, method and content filtering module is provided for analyzing image data received from an imaging sensor, such as a CCD camera, determining whether or not image data meets appropriate criteria, and potentially blocking unacceptable image data, before the data is stored in a device memory or on some other storage medium, or passed to other applications. This system encourages safer and more responsible use of electronic imaging devices without compromising the general utility of said devices. In particular, it may help to protect young people from making and distributing nude, or sexually suggestive pictures, or pictures containing content that is deemed inappropriate, when using a PDA, camera phone, or computer equipped with a camera.