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Easywave time: 2014.07.05
Category: protocol standard-fh8510 description statement: reprinted, please keep the link
NOTE: If any error occurs, please correct it. These are my Learning Log articles ......
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I. Introduction to fh8510 ISP processing chip
Fh8510 is an image signal processing chip for CIS (CMOS image sensor). It has a powerful built-in Image Processing Engine, CMOS image sensor interface, TV encoder, and D/A converter, provides output of NTSC/PAL and ITU. the bt656 10bit output is mainly used for low-end and mid-range SD analog CCTV cameras, on-board rear video cameras, and building intercom cameras. Fh8510 supports multiple CMOS image sensors, featuring low power consumption, high resolution, flexible configuration, and high customization. The default configurations of fh8510 support ov7740 and ov7725, and more CMOS image sensors can be configured through external EEPROM. The fh8510 OSD adopts hardware image data decompression technology. All OSD data can be stored in the EEPROM. Fh8510 provides an ir led and IR cut control interface, allowing you to set the Open and Close threshold values.
Ii. fh8510 internal Diagram
2.1 Video Input
- Supports svga, D1, and VGA input.
- RGB Bayer
- Maximum data Bit Width: 10-bit
- You can configure positive and negative clock along sampling.
- Valid frame and Active Line Signal Polarity configurable
- Maximum pixel clock 54 MHz
2.2 Image Processing (ISP)
- RGB Bayer data format, arbitrary sensor output window coordinates
- Automatic Color to black/white
- Elimination of fixed mode Noise
- Automatic detection and elimination of bad points
- Sensor column fixed mode noise elimination (external 4kb EEPROM)
- Lens Shade correction)
- Configurable lens center position
- Configurable compensation coefficient table
- Automatic black background Elimination
- Adaptive 2D Noise Reduction
- Image Information Statistics
- The number, position, and size of the statistics window can be configured
- Maximum number of statistical windows: 64
- Provides the maximum, minimum, and average values of each window.
- Automatic exposure, flash elimination at 50Hz/60Hz
- Automatic white balance
- CFA Interpolation Based on Edge Detection
- Automatic Color Correction for configurable color space conversion rgb2rgb
- Gamma Correction, configurable gamma table
- Image Enhancement
- Degree contrast, tone, and saturation adjustment
- Image sharpening (5x5 filtering, intensity matching)
- Image Scaling
- You can configure the zoom core to support stepless scaling and match the output and SD formats of the sensor.
- Horizontal and vertical scaling ratio configurable
- Supports 64-phase, and the initial phase is configurable independently.
- Image resolution
- VGA sensor, 420tvl
- D1, svga sensor, 540tvl
2.3 video output
- Composite Video CVBS (NTSC 720 × 480 pal 720 × 576)
- ITU.BT-656 (10bit) output (optional)
2.4 OSD
1 graphic layer superposition (external 8 k eeprom)
- Configurable graphic window position
- Graphic window height and width configurable
- Graphic Data Format configurable (supports lossless compression 1 ~ 6 BPP index Bitmap)
- Configurable color palette content, supports a maximum of 64-color 32-bit color palette (argb8888 format)
- Hardware flash Display Control
- Hardware Graphic Data Extraction
- Hardware graphic data DMA transmission handshake
Clock 2.5
2.6 EEPROM Configuration
- 2 K byte supports multiple CMOS image sensor configurations
- 4 K byte supports multiple CMOS image sensor configurations and column fixation mode noise elimination
- 8 K byte supports multiple CMOS image sensor configurations, column fixation mode noise elimination, OSD
Iii. Typical application scenarios include building intercom, security monitoring, and rear view systems, as shown in the following figure:
It can be directly used with sensor such as ov7725. I don't know what the price is. It looks good, this IC.
