COLOR MASK FOR AN IMAGE SENSOR OF A VEHICLE CAMERA

• US 20100134616A1
• Filed: 07/07/2008
• Published: 06/03/2010
• Est. Priority Date: 08/24/2007
• Status: Abandoned Application

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Bergen, Lothar, Seger, Ulrich, Fritz, Steffen
• Application Number:
  US12/452,935
• Publication Number:
  US 20100134616A1
• Time in Patent Office: Days
• US Class Current: 348/135
• CPC Class Codes: H04N 23/12 with one sensor only
• CPC Class Codes: H04N 25/13 characterised by the spectral characteristics of the filter elements

Abstract

A color mask for an image sensor of a vehicle camera has a matrix arrangement made up of first filter pixels and second filter pixels. In every horizontal row and/or every vertical column, first filter pixels and second filter pixels are situated, the first filter pixels and the second filter pixels having different transmission behaviors. The second filter pixels have a more comprehensive transmission behavior, e.g., completely transparent to optical light. The first filter pixels are preferably red.

Claims

1-12. -12. (canceled)

13. A color mask for an image sensor of a vehicle camera, comprising:

a matrix arrangement of a plurality of first filter pixels and a plurality of second filter pixels, wherein the first filter pixels and the second filter pixels have different transmission behaviors for optical light, and wherein the matrix arrangement includes horizontal rows and vertical columns, and wherein at least one of;

(a) each row of the matrix arrangement includes at least one first filter pixel and at least one second filter pixel; and

(b) each column of the matrix arrangement includes at least one first filter pixel and at least one second filter pixel.

14. The color mask as recited in claim 13, wherein the matrix arrangement includes only the first filter pixels and the second filter pixels.

15. The color mask as recited in claim 13, wherein the wavelength range transmitted by the second filter pixels includes the wavelength range transmitted by the first filter pixels.

16. The color mask as recited in claim 15, wherein the second filter pixels are essentially completely transparent to optical light.

17. The color mask as recited in claim 15, wherein the first filter pixels are red filter pixels.

18. The color mask as recited in claim 15, wherein the first filter pixels are situated offset relative to one another in at least one of (a) sequential rows and (b) sequential columns.

19. The color mask as recited in claim 18, wherein the matrix arrangement has alternating rows of a first row type and a second row type, the first row type solely including second filter pixels and the second row type including both the first and second filter pixels, and wherein two nearest rows of second row type include the first filter pixels in different columns.

20. The color mask as recited in claim 18, wherein the matrix arrangement has alternating columns of a first column type and a second column type, the first column type including both the first and second filter pixels, and the second column type solely including second filter pixels, and wherein two nearest columns of first column type include the first filter pixels in different rows.

21. The color mask as recited in claim 18, wherein the matrix arrangement includes alternating first pixels and second pixels in each column and in each row.

22. The color mask as recited in claim 21, wherein the first filter pixels and the second filter pixels form a chessboard pattern having first diagonals of first filter pixels and second diagonals of second filter pixels.

23. A camera for a vehicle, comprising:

an image sensor having a matrix arrangement of sensor pixels for receiving optical light and outputting image signals; and

a color mask situated in front of the image sensor, wherein the color mask includes;

a matrix arrangement of a plurality of first filter pixels and a plurality of second filter pixels, wherein the first filter pixels and the second filter pixels have different transmission behaviors for optical light, and wherein the matrix arrangement includes horizontal rows and vertical columns, and wherein at least one of;

(a) each row of the matrix arrangement includes at least one first filter pixel and at least one second filter pixel; and

(b) each column of the matrix arrangement includes at least one first filter pixel and at least one second filter pixel;

wherein each filter pixel is situated directly in front of a sensor pixel.

24. A vehicle image-sensing system, comprising:

a camera for a vehicle, the camera including;

an image sensor having a matrix arrangement of sensor pixels for receiving optical light and outputting image signals;

a color mask situated in front of the image sensor, wherein the color mask includes;

a matrix arrangement of a plurality of first filter pixels and a plurality of second filter pixels, wherein the first filter pixels and the second filter pixels have different transmission behaviors for optical light, and wherein the matrix arrangement includes horizontal rows and vertical columns, and wherein at least one of;

(a) each row of the matrix arrangement includes at least one first filter pixel and at least one second filter pixel; and

(b) each column of the matrix arrangement includes at least one first filter pixel and at least one second filter pixel;

wherein each filter pixel is situated directly in front of a sensor pixel; and

at least one control-and-analyzer device receiving image signals from the camera and ascertaining from a time curve of the image signals whether objects emitting a red tail-light or a white head-light are situated in a detection range of the camera.