Distance detector
A distance detector comprising: a laser transmitter and receiver for generating a laser beam to irradiate an object and to receive return light reflected in response from the object, an image detection system for generating an image of a view, the image detection system including an objective lens for collecting light from the view, an image sensor for receiving light collected by the objective lens and for generating the image therefrom, and a digital display for displaying the image such that the digital display displays a real-time image of the view, a laser beam indicium on the digital display or a laser beam indicium generator configured to display laser beam indicium on the digital display, wherein the laser beam indicium indicates a direction of the laser beam, and a range-finding system for determining the distance to an object irradiated by the laser beam using return light and for displaying distance.
1. A distance detector for golf flag detection, wherein the distance detector is an integral device comprising:
a laser transmitter and receiver for generating a laser beam to irradiate an object and to receive return light reflected from the object;
an image detection system for generating an image of a view, the image detection system including an objective lens for collecting light from the view, an image sensor for receiving light collected by the objective lens and for generating the image therefrom, and a digital display for displaying the image such that the digital display displays a real-time image of the view;
a feature detector configured to:
receive the real-time image of the view;
detect one or more objects within the real-time image; and
perform content-based digital image object detection by:
comparing the one or more objects the real-time image with a set of pre-computed image metrics, wherein a golf flag is specified as a desired target object;
determining how well each of the one or more objects matches the desired target object and
identify a best matching object as a golf flag from the one or more objects; and
a range-finding system configured to determine a distance to the golf flag using the return light, and to display the distance.
2. The distance detector of claim 1 , wherein the feature detector is configured to respond to detection of the golf flag by generating an alert to alert a user.
3. The distance detector of claim 1 , comprising a laser beam indicium or a laser beam indicium generator configured to display the laser beam indicium, wherein the laser beam indicium indicates a direction of the laser beam.
4. The distance detector of claim 3 , configured to display the laser beam indicium when the feature detector detects the golf flag, when the range-finding system determines the distance to the golf flag, or when the golf flag is centred in the digital display.
5. The distance detector of claim 1 , wherein the range-finding system displays the distance to a target object on the digital display.
6. The distance detector of claim 1 , wherein, when the laser beam is pointed at the golf flag for more than a first predefined time interval, the range-finding system displays the distance to the golf flag for at least a second predefined time interval.
7. The distance detector of claim 6 , wherein the range-finding system ceases to display the distance to the golf flag after the second predefined time interval.
8. The distance detector of claim 3 , wherein the laser beam indicium comprises cross-hairs.
9. The distance detector of claim 3 , further comprising a view-finder for a user to view the golf flag.
10. The distance detector of claim 9 wherein the range-finding system displays the laser beam indicium so as to be viewable through the view-finder.
11. The distance detector of claim 9 wherein the laser beam indicium comprises one or more marks on the view-finder.
12. The distance detector of claim 1 wherein the feature detector is further configured to control the digital display to display a target object indicium indicating a location of the golf flag on the digital display.
13. The distance detector of claim 12 , wherein the target object indicium at least partially boxes the golf flag as displayed on the digital display.
14. The distance detector of claim 12 , wherein the target object indicium comprises one or more elements displayed on the digital display suggestive of a square, rectangle or other quadrilateral.
15. The distance detector of claim 12 comprising a laser beam indicium which indicates a direction of the laser beam, and wherein the range-finding system is configured to determine the distance to the golf flag when the target object indicium and the laser beam indicium coincide or overlap.
16. The distance detector of claim 3 , wherein the range-finding system comprises the laser beam indicium generator.
17. The distance detector of claim 3 , wherein the laser beam indicium comprises one or more marks on the digital display.
18. A distance detection method for golf flag detection, comprising:
transmitting a laser beam so as to irradiate an object;
receiving return light reflected from the object in response to irradiation of the object;
collecting light of a view that includes the object with an objective lens;
outputting an image of the view based on the return light;
receiving the image and displaying the image on a digital display such that the digital display displays a real-time image of the view;
detecting in the image a golf flag with a feature detector, the feature detector configured to:
receive the real-time image of the view;
detect one or more objects within the real-time image; and
perform content-based digital image object detection by:
comparing the one or more objects the real-time image with a set of pre-computed image metrics, wherein a golf flag is specified as a desired target object;
determining how well each of the one or more objects matches the desired target object and identify a best matching object as a golf flag from the one or more objects;
determining a distance to the golf flag using the return light; and
displaying the distance.
19. The distance detector of claim 1 , wherein the image detection system includes a memory for storing images captured by the image sensor.
20. The distance detector of claim 19 , wherein the feature detector is configured to perform an heuristic algorithm arranged such that each time a golf flag is detected in a user's view, information regarding characteristics of the golf flag is stored in the memory.
21. The distance detector of claim 1 , further comprising a scanning mode that allows a user to move the laser beam across a range of objects including a golf flag as the desired target object to find the distance to the golf flag in real time.
22. The distance detector of claim 1 , further comprising a “lock-in mode” which allows a user to select a golf flag as a particular target object, wherein when the user points the laser beam for more than a first predefined time interval, the golf flag as the particular target object is locked in the image display.
23. The distance detection method of claim 18 , further comprising activating a “scanning mode” that allows a user to move the laser beam across a range of objects including a golf flag as the desired target object to find the distance to the golf flag in real time.
24. The distance detection method of claim 18 , further comprising activating a “lock-in mode” which allows a user to select a golf flag as a particular target object, wherein when the user points the laser beam at the golf flag for more than a first predefined time interval, the golf flag is locked in the image display.