Camera Based Method For Text Input And Keyword Detection
First Claim
1. Camera based method for text input and detection of a keyword or of a text-part within a printed page or a screen containing the keyword/text-part comprising the steps of:
- a) directing a camera module on the printed page or on the screen and continuously displaying the image acquired by the camera module;
b) capturing an image with the camera module, containing the keyword or text-part therein and displaying the captured image;
c) digital image filtering of the captured image including contrast enhancement, shadow compensation, unwarping and rotation of the captured image in order to obtain an artifact reduced image with a substantially horizontal text alignment;
d) detection of word blocks contained in the artifact reduced image, each word block containing most likely a recognizable word;
e) performing OCR within each word block to get its text content;
f) determination of A-blocks among the word blocks according to a keyword probability determination rule, wherein each A-block containing most likely the keyword, such that the A-blocks are preselected among the word blocks for a further selection;
g) assignment to each A-block an attribute, which can preferably be an enumerated number;
h) indication of the A-blocks in the display by a frame or a background color and displaying their attributes as overlays within the artifact reduced and displayed image for the further selection of the keyword;
i) further selection of an A-block containing the keyword based on the displayed attribute of the keyword;
j) displaying the text content of the further selected A-block and forwarding the text content as text input to a current application running on a mobile communication device containing the camera or to a camera connected electronic device.
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Abstract
The present invention relates to a camera based method for text input and detection of a keyword or of a text-part within page or a screen comprising the steps of: directing a camera module on the printed page and capturing an image thereof; digital image filtering of the captured image; detection of word blocks contained in the image, each word block containing most likely a recognizable word; performing OCR within each word block; determination of A-blocks among the word blocks according to a keyword probability determination rule, wherein each of the A-blocks contains most likely the keyword; assignment of an attribute to each A-block; indication of the A-blocks in the display by a frame or the like for a further selection of the keyword; further selection of the A-block containing the keyword based on the displayed attribute of the keyword; forwarding the text content as text input to an application.
10 Citations
1 Claim
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1. Camera based method for text input and detection of a keyword or of a text-part within a printed page or a screen containing the keyword/text-part comprising the steps of:
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a) directing a camera module on the printed page or on the screen and continuously displaying the image acquired by the camera module; b) capturing an image with the camera module, containing the keyword or text-part therein and displaying the captured image; c) digital image filtering of the captured image including contrast enhancement, shadow compensation, unwarping and rotation of the captured image in order to obtain an artifact reduced image with a substantially horizontal text alignment; d) detection of word blocks contained in the artifact reduced image, each word block containing most likely a recognizable word; e) performing OCR within each word block to get its text content; f) determination of A-blocks among the word blocks according to a keyword probability determination rule, wherein each A-block containing most likely the keyword, such that the A-blocks are preselected among the word blocks for a further selection; g) assignment to each A-block an attribute, which can preferably be an enumerated number; h) indication of the A-blocks in the display by a frame or a background color and displaying their attributes as overlays within the artifact reduced and displayed image for the further selection of the keyword; i) further selection of an A-block containing the keyword based on the displayed attribute of the keyword; j) displaying the text content of the further selected A-block and forwarding the text content as text input to a current application running on a mobile communication device containing the camera or to a camera connected electronic device.
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Specification