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WT8893
The WT8893 is a highly-integrated video processor SoC dedicated for ADAS/AVM applications. The chip includes CVBS input from 4 channel video decoders, 4 individual contrast/brightness adjustment function, input scaling up/down for accurate fish-eye correction, input image position adjustment function to correct the camera assembling error, video image processing, fisheye correction, perspective adjustment, combine front/rear/left/right four images to top view with adjustable image size and boundary fusion processing providing seamless AVM image, AWB technology to provide a uniform image, output video contrast/ brightness/ sharpness adjustment and scaling adjustment, OSD, video encoder, output interface with one analog NTSC/PAL CVBS or digital CCIR 656/601 output or DVR 720P raw data (30/60Hz), serial flash memory (max. 2ea) for JPG and MCU code, external 1GB (64M*16) DDR for video buffer (max. 2GB), and SPI/I2C interfaces. This chip has been qualified for the Automotive Electronics Council standard Q100 (AEC-Q100) Grade 2. While most AVM chips in the market are DSP-based solution, the WT8893 is hardwired ASIC which provides cost-effective solution with low-power consumption compared to its counterparts.
Features
- 32-bit MCU embedded
- Video digital input interface
CVBS input from 4 channel video decoders through CCIR 656, YUV 4:2:2 image format
- Resolution: NTSC 720 x 480i,PAL 720 x 576i
- 4-channel multiplexed inputs at 108 MHz with 9-bit inputs
- Input video color process
- 4 individual vignetting compensation
- Input scaling up/down for accurate fish-eye correction
- Input image position adjust to correct error of assembling camera
- 4 individual picture X-Y axis position and size adjustment
- 4 individual mirror function
- Fish-eye correction Process
- Display video and video image process
(a) Front video: original, horizontal 180° (XV(-45)), horizontal 130° (FE(130))
(b) Rear video: original, horizontal 180° (XV(-45)), horizontal 130° (FE(130))
(c) Right video: original, horizontal 65° (YV(50~80) + FE(90) + ZV(45))
(d) Left video: original, horizontal 65° (YV(50~80) + FE(90) + ZV(45))
(e) AVM video: front + rear + right + left video image process
(f) Adjustable resolution 1°
(g) 4 video input sources can be selected to any 4 video processes.
- Fish eye angle correction
(a) adjustable range 130° ~ 190°, adjustable resolution 1°
(1) 150° (115° horizontal - 85° vertical -150° diagonal) (±5°)
(2) 170° (130° horizontal - 96° vertical -170° diagonal) (±5°)
(3) 180° (180° horizontal - 112° vertical - 180° diagonal) (±5°)
(b) 4 individual lens distortion calibration: 4 stage radial ± adjustment
- New video process algorithm improve image saw-tooth
- Perspective adjustment
- Combine 4 images to top view
(a) adjust the image size of front/rear/left/right
(b) content shift up/down/right/left and few angle rotation
(c) the AVM image spilt screen can be adjusted
- Video window width / height / location adjustment
- Scaling up/down process
Output video zoom in/out and position adjustment
- Provide seamless AVM image by fusion boundary
- Increase 4 images uniformity by auto white balance
- Frame Rate Conversion
- From 50/60 Hz input to 50/60 Hz output
- Group Delay Under 100ms
- Output video color process
- Contrast adjustment
- Brightness adjustment
- Sharpness adjustment
- OSD
- Support multi overlap layers display including background ICON Video, Static parking guidance lines, distance display, Visualization UPA.
- Background/ICON
- Support JPG file format
- JPG file for ICON and background
- Support JPG file alpha-blending and dynamic image fade in/fade out effect
- Support JPG file transparent
- Support JPG copy / move function
- 6 layer overlap including JPEG, UPA, ...etc.
- Character using for distance display
(a) Character size16*18 pixel
(b) Support 64 colors
(c) Support alpha-blending and transparent
(d) Support 2X, 3X, 4X magnify
(e) Support blinking (programmable period and duty cycle)
(f) Position could be adjusted
- Static parking guidance lines
(a) 8 colors (user programmable) for static car motion line function
(b) Support alpha-blending
(c) Line width size can be adjusted
(d) Position can be adjusted
(e) Support fish-eye (non-straight) mode
- Visualization UPA
(a) Support 4 rectangle display
(b) Support 8 color (user programmable) for display
(c) Support alpha-blending for display
(d) Position and size could be adjusted
- Overlap layer priority
- Video < JPG (background) < Static distance guide lines < Character < Visualization UPA
- Adjust individual alpha-blending register
- Output process
- Support ouput scaling adjustment
- Video encoder
- Standard Video output CVBS: NTSC/PAL
- Output interface
- 1 analog NTSC/PAL CVBS
- 1 digital CCIR 656 or 601 output
- DVR Raw Data 720P (30/60 Hz)
- Memory Interface
- Serial flash memory (max. 2ea) for JPG and MCU code
- Support 1GB 64M*16 (Max. 2Gb) DDR2 SDRAM memory for video buffer
- Slave mode controller Interface
- High speed SPI/I2C interface
- Electrical Characteristics
- Operating Temperature: -40 ºC ~ +105 ºC
- Storage Temperature: -50 ºC ~ +125 ºC
- AEC-Q100
- This product has been qualified to the Automotive Electronics Council (AEC) standard Q100 (Grade 2)
- 32-bit MCU embedded