Processor controls all imaging
10 June 2008
The STv0986 mobile imaging processor from STMicroelectronics controls a phone’s imaging subsystem.
The standalone image signal processor has dual camera support for DSC (digital still camera) perfomance in mobile applications such as PDAs, mobile games, security cameras and video phones, according to the company. The processor supports camera modules including SMIA (standard mobile imaging architecture) compatible sensors with up to 5Mpixel resolution.
An image correction chain, from noise reduction to smooth digital zoom, a JPEG encoder with programmable quantisation tables and compression factors are included. The advanced algorithms enables what the company describes as exceptional quality images. The processor can also support effects such as mirroring, flip and rotation and colouring, such as sepia and black and white.
Continuous video streaming is up to 20frame/sec at 3Mpixel and 12.5frame/sec at 5Mpixel resolution.
The twin video processing pipe architecture eliminates shutter delay so that the captured image matches the current viewfinder frame. It also delivers a full-frame rate camcorder mode, with simultaneous local viewfinder support and video capture though an optional 4x digital zoom.
The autofocus control loop enables the processor to provide still and autofocus with a fast lock of 0.6sec. The autofocus also allows various actuator technologies, such as voice coil, piezo and stepper motors. Image stabilisation is achieved through a combination of light sensitivity control and best-picture identification.
The device can be used with the company’s VB6851, a SMIA-compliant QXGA auto-focus camera and the VS6555, ultra-low power VGA reflowable camera module, optimised for video conferencing.
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