Automatic image capture
An improved automatic image capture system for an intelligent mobile device having a camera guides a user to position the camera so only a single image needs to be automatically captured. A trapezoidal view finder on a display of the intelligent mobile device may be used to orient the camera with respect to a target document so there is an appropriate pitch and roll angle between the camera and the target document to avoid shadows caused by the camera or user. Further the user is guided to maximize the occupancy of the view finder with the document so that the document is maximized within the view finder. When all requisite conditions are satisfied, the camera automatically captures the image of the document for post-processing.
1. A method of automatic image capture of a target document using an intelligent mobile device having a camera comprising the steps of:
showing a view finder on a display of the intelligent mobile device;
guiding a user to maximize occupancy of the view finder with an image of the target document as a first condition; and
automatically capturing the target document image for post-processing when the occupancy is maximized;
wherein a shape of the view finder comprises a trapezoidal shape such that when a preferred pitch and roll angle of the camera with respect to the target document is achieved, the camera is tipped back from vertical and there is no shadow from the camera or user within the view finder.
2. The method as recited in claim 1 further comprising the step of:
directing the user to orient the camera with respect to the target document so that the target document image is oriented to correspond to a given shape of the view finder prior to the capturing step.
3. The method as recited in claim 1 further comprising the step of:
testing the target document for sufficient brightness and contrast with respect to a background for the target document as a second condition prior to the capturing step.
4. The method as recited in claim 3 further comprising the step of:
determining the corners of the target document image within the view finder as a third condition prior to the capturing step.
5. The method as recited in claim 4 further comprising the step of:
assuring focus of the camera with respect to the target document as a fourth condition prior to the capturing step.
6. The method as recited in claim 5 further comprising the step of repeating the steps of claims 1 and 3 - 5 should any of the conditions fall outside acceptable parameters prior to the capturing step.
7. The method as recited in claim 5 further comprising the step of checking stability of the camera with respect to the target document prior to the capturing step.
8. The method as recited in claim 1 wherein the guiding step comprises the steps of:
displaying the view finder on the display as a static view finder;
displaying a secondary view finder on the display that is oriented with the camera and moves as the camera moves relative to the target document; and
orienting the camera with respect to the target document so that the secondary view finder is superimposed on the static view finder, indicative of the appropriate positioning of the target document image within the view finder.
9. The method as recited in claim 1 wherein the guiding step comprises the steps of:
displaying a target box at the center of the view finder on the display; displaying a cross-hair on the display that is tied to motion of the camera; and
orienting the camera with respect to the target document so that the cross-hair is within the target box, indicative of the appropriate positioning of the target document image within the view finder.
10. The method as recited in claim 1 wherein the guiding step comprises the step of:
animating an indicia on the display to provide the user with information as to which direction to move the camera to maximize occupancy.
11. The method as recited in claim 10 wherein the animating step comprises the steps of:
determining a distance from each edge of the target document image to the corresponding edge of the view finder;
based upon the distances initiating the direction in which the camera should be moved to maximize occupancy; and
moving the indicia in a manner to indicate the direction to the user.
12. The method as recited in claim 11 wherein the direction is selected from the group consisting of in or out, left or right, up or down and rotate.
13. A method of automatic image capture of a target document using an intelligent mobile device having a camera comprising the steps of:
showing a trapezoidal view finder on a display of the intelligent mobile device;
guiding a user of the intelligent mobile device to orient the camera at an appropriate pitch and roll angle with respect to the target document so an image of the target document has approximately the same trapezoidal shape on the display as the trapezoidal view finder and so that the camera and user do not cast a shadow on the target document image; and
automatically capturing the target document image for post-processing when the target document image satisfies required conditions within the trapezoidal view finder.
14. The method as recited in claim 13 further comprising the step of:
directing the user to maximize occupancy of the trapezoidal view finder with the target document image as one of the required conditions prior to the capturing step.
15. The method as recited in claim 14 further comprising the step of:
testing the target document for sufficient brightness and contrast with a background of the target document as one of the required conditions prior to the capturing step.
16. The method as recited in claim 15 further comprising the step of:
determining the corners of the target document image within the trapezoidal view finder as one of the required conditions prior to the capturing step.
17. The method as recited in claim 16 further comprising the step of:
assuring focus of the camera with respect to the target document as one of the required conditions prior to the capturing step.
18. The method as recited in claim 17 further comprising the step of:
repeating the steps of claims 13 - 17 should any of the required conditions fall outside acceptable parameters prior to the capturing step.
19. The method as recited in claim 13 wherein the guiding step comprises the steps of:
displaying the trapezoidal view finder on the display as a static trapezoidal view finder;
displaying a secondary trapezoidal view finder on the display that is oriented with the camera and moves as the camera moves relative to the target document; and
orienting the camera with respect to the target document so that the secondary trapezoidal view finder is superimposed on the static trapezoidal view finder, indicative of the appropriate positioning of the target document image within the static trapezoidal view finder.
20. The method as recited in claim 1 wherein the guiding step comprises the steps of:
displaying a target box at the center of the trapezoidal view finder on the display;
displaying a cross-hair on the display that is tied to motion of the camera; and
orienting the camera with respect to the target document so that the cross-hair is within the target box, indicative of the appropriate positioning of the target document image within the trapezoidal view finder.