| ST STV0986超低功耗图像处理方案 |
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| 作者：ST 来源：本站原创 点击数：127 更新时间：2008-6-11 |
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ST公司的STV0986超低功耗图像处理器是高性能可单独使用的图像信号处理器,能把数码相机(DSC)相似的性能带到移动手机中. STV0986能控制手机中的整个图像处理子系统,支持各种照相机模块,包括和SMIA(标准的移动图像架构)兼容的分辨率高达500万象素的传感器.因此STV0986广泛应用在移动手机,PDA和无线安全照相机.本文介绍了STV0986的主要性能,方框图和应用框图.
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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