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| ST STV0986超低功耗图像处理方案 | |||||
作者：ST 文章来源：ST 点击数： 更新时间：2008-6-16  |
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The STV0986 is an ultra low power megapixel digital image processor designed to fit into mobile applications. The STV0986 contains advanced image correction, noise reduction techniques and a smooth digital zoom facility, resulting in exceptional image quality in today’s multimegapixel images. The STV0986 supports 2 SMIA sensors, flashgun (LED or Xenon), autofocus and programmable general purpose IOs for additional external actuators. The internal buffer and versatile clock manager within the STV0986 accommodates a wide range of data-rates between the sensors, the STV0986 and the host. 主要特性: ■ Supports 2 mutually exclusive SMIA profile 2 compliant sensors of up to 5 Megapixel resolution(a) ■ Interfaces – Sensor interface: 2 x SMIA CCP Class 2(b) receivers (640Mbit/s) – Host interface: SMIA CCP Class 1(b) transmitter (416Mbit/s) or ITU (8-bit CCIR interface, up to 80MHz) – Control interface: I²C (400kHz) ■ Enhanced video processor – Noise and defect filtering, color reconstruction, sharpness enhancement, 4-channel lens shading correction and barrel distortion correction – Statistic processor for automatic exposure, automatic white balance and auto-focus control – General purpose input/outputs (GPIOs) for controlling external actuators ■ 2 video pipes for full frame-rate concurrent viewfinder and video/still capture. Single shot (e.g. flashgun) thumbnail generation – Gamma correction programmable for both CRT and LCD displays – Color correction matrix – Digital zoom: Smooth 16X downscale capability with up-scale capability to 4X ■ Output formats: JPEG, YUV4:2:2, YUV4:2:0, Planar YUV4:2:0 (up to CIF), RGB888, RGB565, RGB444 ■ 4:2:0 JPEG compression with programmable quantization matrix and target file size ■ JPEG operations up to 30 fps at 2 Megapixel resolution, up to 20 fps at 3 Megapixel resolution, and up to 12.5 fps at 5 Megapixel resolution ■ Interleaved video modes (concurrent viewfinder and video/still capture) – ‘Alternate frame’ mode up to 15 fps – ‘Single frame’ mode up to 30 fps ■ Image rotation/mirroring/flip support for viewfinder (up to CIF) ■ Independent host interface transmitter clock, generated by an embedded PLL - frequency selectable by host ■ Synchronised flash gun control with red-eye reduction (pre-flash and main-flash strobes for high-power LED or Xenon strobe control) ■ Enhanced multi-zone auto-focus (supporting up to 9 zones with programmable weighting) 应用: ■ Mobile phone ■ PDA ■ Wireless security camera  图1. STV0986方框图  图2. STV0986应用框图 详情请见: http://www.st.com/stonline/products/literature/bd/13027.pdf |
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