Redundant video path for vehicle rear view camera system
A rear view video system for a vehicle includes a display and a rear view camera that generates a raw video signal. A video modification module receives the raw video signal and generates a modified video signal based thereon. A video analysis module analyzes whether the modified video signal is valid or invalid. A switch outputs the modified video signal to the display when the vehicle is in reverse and the modified video signal is valid and outputs the raw video signal to the display when the vehicle is in reverse and the modified video signal is invalid.
1. A rear view video system for a vehicle, comprising:
a display;
a rear view camera that generates a raw video signal;
a video modification module that receives the raw video signal and that generates a modified video signal based thereon;
a video analysis module that analyzes whether the modified video signal is valid or invalid; and
a switch that outputs the modified video signal to the display when the vehicle is in reverse and the modified video signal is valid and that outputs the raw video signal to the display when the vehicle is in reverse and the modified video signal is invalid.
2. The rear view video system of claim 1 , further comprising a buffer arranged between the rear view camera and the video modification module.
3. The rear view video system of claim 1 , wherein the video modification module serializes the modified video signal.
4. The rear view video system of claim 3 , further comprising a deserializer arranged between the video modification module and the switch.
5. The rear view video system of claim 1 , wherein the video analysis module determines that the modified video signal is invalid when the modified video signal includes a frozen image.
6. The rear view video system of claim 5 , wherein the video analysis module calculates a phase difference for images in the modified video signal to determine whether or not the modified video signal includes the frozen image.
7. The rear view video system of claim 1 , wherein the video analysis module determines that the modified video signal is invalid when the modified video signal includes an all-white image or an all-black image.
8. The rear view video system of claim 7 , wherein the video analysis module determines whether or not the modified video signal includes the all-white image or the all-black image based upon luma values.
9. The rear view video system of claim 1 , further comprising a serializer arranged between the switch and the display.
10. The rear view video system of claim 1 , wherein the video modification module adds overlay information to the raw video signal when generating the modified video signal.
11. The rear view video system of claim 1 , further comprising side and front view cameras, wherein the video modification module combines the raw video signal with images from the side and front view cameras when generating the modified video signal.
12. The rear view video system of claim 1 , wherein the video analysis module determines that the modified video signal is invalid when the video modification module does not generate the modified video signal within a predetermined period after a reverse event occurs.
13. A video output system for a vehicle, comprising:
a video modification module that receives a raw video signal from a first camera and that generates a modified video signal based thereon; and
a video analysis module that analyzes whether the modified video signal is valid or invalid and that outputs the modified video signal when the modified video signal is valid and that outputs the raw video signal when the modified video signal is invalid.
14. The video output system of claim 13 , wherein the video analysis module determines that the modified video signal is invalid when the modified video signal includes a frozen image.
15. The video output system of claim 14 , wherein the video analysis module calculates a phase difference for images in the modified video signal to determine whether or not the modified video signal includes the frozen image.
16. The video output system of claim 13 , wherein the video analysis module determines that the modified video signal is invalid when the modified video signal includes an all-white image or an all-black image.
17. The video output system of claim 16 , wherein the video analysis module determines whether or not the modified video signal includes the all-white image or the all-black image based upon luma values.
18. The video output system of claim 13 , further comprising a serializer arranged between the video analysis module and a display.
19. The video output system of claim 13 , wherein the video modification module adds overlay information to the raw video signal when generating the modified video signal.
20. The video output system of claim 13 , wherein the video modification module combines the raw video signal with images from a second camera when generating the modified video signal.