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)


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