Method for extracting raw data from an image resulting from a camera shot
a camera shot and raw data technology, applied in the field of extraction of raw data from an image resulting from a camera shot, can solve the problems of difficult to obtain the threshold, insufficient, and complicated homographic calculations used to date,
Inactive Publication Date: 2010-02-11
REAL EYES 3D
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Benefits of technology
[0027]For this purpose, first of all, it provides a method for accurately determining a noise contextual datum used for correcting the extracted raw data, and notably, the threshold value Vs at which the printed or handwritten information may be extracted without being concerned with knowing whether the grid lines are present or not, regardless of the sought-after pattern. Further, this threshold value may be used as a gradient threshold for seeking the pattern in order to reduce the processing requirements to the one and only pattern searching step. If the intention is to extract information for a color image, each color component of the image should be considered for calculating a unique threshold in order to extract color information.
[0140]Moreover, with the purpose of eliminating the drawbacks of the searching methods for patterns (physical, plotted, or printed contours), expressing some contextual data and involving proportions set beforehand, the invention proposes determining the real height / width ratio of the quadrilateral formed by four identified points of a pattern present in the image of a contour which is used for determining some contextual data of the image and this, in order to be able to reconstruct a document having the same proportions.
[0158]An important advantage of this method consists in that it is not very sensitive to lack of orthogonality of the adjacent sides of the quadrilateral which is frequently the case when the quadrilateral is a pattern plotted by hand. Indeed, conventional solutions are particularly sensitive to such defects (instability in the case of lack of orthogonality).
Problems solved by technology
It is found that this threshold is difficult to obtain by using a conventional histogram technique which does not provide satisfactory results.
It is found that one of the drawbacks of this method precisely consists in that it involves proportions set beforehand.
Moreover, it is found that the homographic calculations used hitherto, are particularly complicated.
Method used
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Embodiment Construction
[0176]In the example illustrated in FIG. 1, the original document which is intended to be shot with a camera is positioned on a planar supporting medium, horizontally.
[0177]The camera is positioned above the plane of the supporting medium and therefore of the document, at a determined height, the axis of the camera which is orientated towards the document being oblique (here, an angle of incidence of about 30°).
[0178]The image of the document taken by the camera is located in an image plane which extends perpendicularly to the optical axis of the camera.
[0179]The orthogonal projection of the optical centre C of the camera in the plane of the supporting medium is called the base of the camera.
[0180]The plane passing through point C which is parallel to the plane of the supporting medium is the apparent horizon of the supporting medium.
[0181]The pattern of a rectangle of document DT provides at the image, a quadrilateral A, B, C, D (FIG. 2), the segments DC and AB of which are borne b...
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The method according the invention allows the extracting raw data from an image resulting from a camera shot.It comprises determining, for each point of the image of a combination V0[C,L] of colour components of the image, calculating, for each point of the image, of a value VN+1[C,L], iterating said calculating a predetermined number of times then taking into account the values of the final image VNfinal [C, L] in each point of the image, calculating for each point of the image of the difference D [C, L]=VNfinal [C, L]−V0 [C, L], calculating of a noise contextual datum VS, correcting the extracted raw data D[C, L], with the contextual datum VS, calculating of a corrected value I*[C, L] taking into D*[C, L] and presenting the extracted data under a desired angle.
Description
BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a method for extracting raw data from an image resulting from a camera shot.[0003]More specifically but not exclusively, it relates to a method for presenting data extracted from an image along a desired view angle, from a digital image taken by a photographic or cinematographic camera whether integrated or not into a communication device under any incidence.[0004]It is notably applied to transmission and storage of text data and digitized graphics viewed beforehand by a camera under any incidence and then processed by correcting the projective deformation and / or optionally by enhancing the resolution in order to obtain a corrected image having higher legibility, viewed along an angle of incidence different from that of the camera shot, for example under normal incidence or any predetermined incidence. Of course, with the invention useful information may be extracted before or after corr...
Claims
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IPC IPC(8): H04N5/217G06K9/40G06T3/00H04N5/262
CPCG06T3/00H04N5/262H04N9/64H04N23/00
InventorLEFEBURE, MARTINBENABID, ANAS
OwnerREAL EYES 3D