LEOCULUS - Automotive Video Interface

Brief Summary:

 

What:

Leoculus is an interface to display analog video from a Rear View Camera on car monitors that only display digital video (Peugeot S.A., Tesla Motors, etc.).

Why:

There are after-market interfaces with many features for these cars, but they are expensive and most people want the RVC option the most. They're paying for things they don't really want.

How:

The interface transmits the camera feed when it's on reverse, and the on-board computer's feed otherwise. It's a 2 to 1 mux. It has to decode and serialize the input video signal first.

Here's a schematic:

 

• The camera's output/interface input is analog video, CVBS (Composite, Video, Blanking, Sync).
• CVBS injected into processor/decoder for chroma/luma separation. Output is 8 bit BT656 / YCbCr video.
• Serialization of YCbCr/BT656 for transmission over LVDS (Low-Voltage Differential Signaling).
• Injected into a multiplexer. Input selected when the car is on "reverse".
• The other multiplexer's input is active otherwise and relays what the head-unit normally shows.

Input signal	Connector	Output Signal	Connector
On-board computer	LVDS-HSD	Digital video to LCD screen	LVDS HSD
RVC CVBS	RCA connector
Reverse light + GND	2 pin connector

 

 

Details:

Camera	Specs
	Technology: CCD.cam Oscillator: 27MHz (from teardown). Output signal: Analog, CVBS. NTSC/PAL. Connector: RCA plug. Chipset: PC3089

Screen	Specs
	Tech: TFT LCD touchscreen. Make: Continental. EMF DGT2 CEM01 Dimensions: 7″, 800×480 Connector: 4pin Fakra HSD-LVDS 90° jack

Connector	Specs
	Reference: D4S20G-400A5-B Color: White (type B). Number of Pins: 4. Manufacturers: Rosenberger, Amphenol, Yamaichi, etc.