WT8893
【 General Description 】 |
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) |