integrated colour filters, per pixel, to enable red, green and blue to be sensed, each on their own set of pixels. The individual pixel filters present a significant manufacturing challenge. However some camcorders, even consumer grade devices such as the JVC GZ-HD3, introduced around 2007, are triple sensor cameras, usually CCD but could be CMOS. In this case the exact alignment of the three sensors so that the red, green and blue components of the video output are correctly aligned, is the manufacturing challenge. Recorder The recorder writes the video signal onto a recording medium, such as magnetic videotape. Since the record function involves many signal-processing steps, some distortion and noise historically appeared on the stored video; playback of the stored signal did not have the exact characteristics and detail as a live video feed. All camcorders have a recorder-controlling section, allowing the user to switch the recorder into playback mode for reviewing recorded footage, and an image-control section controlling exposure, focus and color balance. The image recorded need not be limited to what appeared in the viewfinder. For documenting events (as in law enforcement), the field of view overlays the time and date of the recording along the top and bottom of the image. The police car or constable badge number to which the recorder was given, the car's speed at the time of recording, compass direction and geographical coordinates may also be seen. Functionality Dedicated camcorders are usually equipped with optical image stabilization, optical zoom, stereo microphone, and touch screen. Additional possible features include a viewfinder (usually digital), a pressure-sensitive knob for zooming at a controllable speed, LED lamp for illuminating in darkness – possibly with an option to adjust automatically, night vision which may be assisted by an infrared lamp, still photography, the ability to capture still photos while filming – usually at a higher resolution than the video, the ability to lock the OIS on far subjects while zoomed in (named "OIS Lock" by Panasonic), the ability to buffer footage before pressing the "record" button to avoid missing moments without having to be constantly recording (named "PRE-REC" by Panasonic), the ability to keep the lens cover open for few minutes into stand-by mode for rapid restarting, internal storage for recording when the inserted memory card's space is exhausted, autofocus able to track objects, and optional visual effects during video recording and playback.:p37<ref name=bh-HC-V500>[https://www.bhphotovideo.com/c/product/839115-REG/Panasonic_HC_V500M_V500M_Full_HD_Camcorder.html Panasonic HC-V500/V500M Full