Digital camera

Patent metadata

Field	Value
Publication number	US-9716845-B2
Application number	US-201514639186-A
Country	US
Kind code	B2
Filing date	Mar 5, 2015
Priority date	Mar 6, 2014
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

A digital camera has a 2D image sensor designed as a CCD or CMOS sensor that can be used to measure distances based on a runtime measurement in synchronization with a pulsed infrared source. The measured distances are used to carry out a 3D reconstruction of a detected object. The digital camera does not have to have an infrared cut-off filter; however, it can have an infrared cut-off filter that can be dynamically activated in full or in part or deactivated in relation to pixels of the image sensor. In the latter event, individual areas of the image sensor, for which the infrared cut-off filter is deactivated, are used for the 3D reconstruction or for images in the infrared range. The remaining areas of the sensor are used for images of high color quality in the visible light spectrum. In the event that no infrared cut-off filter is present, individual areas of the image sensor are used for the 3D reconstruction or for images in the infrared range. The remaining areas of the sensor are used for images in the visible light spectrum.

First claim

What is claimed is:

1. A digital camera with a 2D image sensor that is operative to measure distances based on a runtime measurement in synchronization with a pulsed infrared source and based on which the measured distances are used to carry out a 3D reconstruction of a detected object, the improvement wherein the camera does not have an infrared cut-off filter or wherein it has an infrared cut-off filter that can be dynamically activated in full or in part or deactivated in relation to pixels of the image sensor; wherein in the event that the infrared cut-off filter can be dynamically activated in full or in part or deactivated in relation to the pixels of the image-sensor, individual areas of the image sensor, for which the infrared cut-off filter is deactivated, are used for the 3D reconstruction or for images in the infrared range; wherein the remaining areas of the sensor are used for images of high color quality in the visible light spectrum; and wherein, in the event that no infrared cut-off filter is present, individual areas of the images sensor are used for the 3D reconstruction or for images in the infrared range, whereby the remaining areas of the sensor are used for images in the visible light spectrum.

2. The digital camera defined in claim 1 , wherein the respective areas of the sensor are either (1) contiguous, such that individual areas each comprising a plurality of pixels are used for the 3D reconstruction and/or for images in the infrared range and individual areas, each comprising a multitude of pixels for images in the visible light spectrum, or (2) the sensor areas are alternatingly associated pixel-by-pixel with the 3D reconstruction and/or images in the infrared range and images in the visible light spectrum.

3. The digital camera defined in claim 1 , wherein the infrared cut-off filter is activated for the entire sensor area in time multiplex operation; wherein the operation of the sensor is divided in time for images in the infrared range, including 3D reconstruction, and for images in the visible light spectrum.

4. A The digital camera defined in claim 1 , wherein the image sensor is expanded by special pixels in the form of at least one of pn-photo diodes, gates and pinned diodes; and wherein the distance measurements and the 3D reconstruction are carried out using the special pixels.

5. The digital camera defined in claim 4 , wherein the pixels of the sensor that are not special pixels do not have an infrared cutoff filter or have an infrared cut-off filter that can be dynamically activated in full or in part in relation to these pixels of the image sensor; wherein individual areas of the image sensor for which the infrared cut-off filters are deactivated are used for images in the infrared range; wherein the remaining areas of the sensor are used for images of high color quality in the visible light spectrum; wherein in the event that no infrared cut-off filter is present, individual areas of the image sensor are used for images in the infrared range; and wherein the remaining areas of the sensor are used for images in the visible light spectrum.

6. The digital camera defined in claim 4 , wherein the image sensor includes an integrated 3D evaluation logic.

7. The digital camera defined in claim 1 , wherein the camera is operative to realize five modes: “images in the visible range,” “images in the infrared range,” “images in the visible and infrared range,” “images in the visible range and 3D reconstruction” and “3D reconstruction.”

8. The digital camera defined in claim 1 , wherein the image sensor includes an integrated pulsed infrared source.

9. The digital camera defined in claim 1 , wherein the infrared cut-off filters form a combination with at least one of an adjustable micro-mirror arrangement, a piezo-electrically controllable interference filter and an electrically tunable liquid crystal filter.

10. A method of using the digital camera defined in claim 1 , comprising the steps of operating a vehicle barrier having a barrier column, a barrier arm and a drive mechanism for pivoting the barrier arm between a blocking position and an open position, wherein the digital camera is used for at least one of a vehicle recognition, a license plate recognition, recognizing a following vehicle and monitoring for vandalism, and wherein images obtained by the digital camera are evaluated by an electronic evaluation logic device that is connected to a control of the vehicle barrier.

11. The digital camera defined in claim 1 , wherein the camera comprises at least one of a CCD or CMOS sensor.

12. The digital camera defined in claim 4 , wherein the camera comprises at least one of a CCD or CMOS sensor.

13. The digital camera defined in claim 4 , wherein the camera is operative to realize five modes: “images in the visible range,” “images in the infrared range,” “images in the visible and infrared range,” “images in the visible range and 3D reconstruction” and “3D reconstruction.”

14. The digital camera defined in claim 4 , wherein the image sensor includes an integrated pulsed infrared source.

15. The digital camera defined in claim 4 , wherein the infrared cut-off filters form a combination with least one of an adjustable micro-mirror arrangement, a piezo-electrically controllable interference filter and an electrically tunable liquid crystal filter.

16. A method of using the digital camera defined in claim 4 , comprising the steps of operating a vehicle barrier having a barrier column, a barrier arm and a drive mechanism for pivoting the barrier arm between a blocking position and an open position, wherein the digital camera is used for at least one of a vehicle recognition, a license plate recognition, recognizing a following vehicle and monitoring for vandalism, and wherein images obtained by the digital camera are evaluated by an electronic evaluation logic device that is connected to a control of the vehicle barrier.

Assignees

• Skidata Ag

Inventors

• Schlechter Thomas

Classifications

• G01S7/4816 Primary

  of receivers alone · CPC title

• G02B5/208

  for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation · CPC title

• H04N13/207

  using a single two-dimensional [2D] image sensor · CPC title

• H04N13/254

  in combination with electromagnetic radiation sources for illuminating objects · CPC title

• H04N5/2226

  Determination of depth image, e.g. for foreground/background separation (determining depth by image analysis in general G06T7/50; segmentation by image analysis in general G06T7/10) · CPC title