Method for shooting and taking evidence through handheld camera

A camera shooting and hand-held technology, applied in image data processing, instruments, calculations, etc., can solve the problems of lost line segment length and distance of blanking points, high algorithm time complexity, and inability to adapt to practical applications, etc. The method is simple to achieve. , the effect of wide application prospects and low complexity

Inactive Publication Date: 2013-05-01
TIANJIN UNIV
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AI Technical Summary

Problems solved by technology

[0006] For digital images, the currently commonly used detection algorithms for blanking points are: the first type uses statistical methods to estimate line parameters according to image edge features, and then uses the obtained parameters to calculate blanking points [1]. Although it has an advantage in theory, the time complexity of the algorithm is high, and the effic...

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  • Method for shooting and taking evidence through handheld camera
  • Method for shooting and taking evidence through handheld camera
  • Method for shooting and taking evidence through handheld camera

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Embodiment Construction

[0034] The present invention is a detection algorithm of the third type of blanking point, which uses the straight line information in the image to calculate the blanking point [2] [3]. The method has the advantages of being simple and general, and the algorithm complexity is low.

[0035] There are four steps in the hand-held camera shooting forensic technology. The following is a detailed description of these four steps:

[0036] Step 1: Extract the straight line information of the original image

[0037] In the world coordinate system, there are many parallel or intersecting straight lines in man-made buildings, and such straight lines also exist in man-made objects such as bridges and roads. The obtained projection planes will intersect at a point, which is the blanking point. The camera rotation angle can be expressed by using the hidden line calculated in the picture, that is, the tilt angle of the horizon. The hidden line is obtained through the hidden point, so the ...

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Abstract

The invention relates to an image evidence-taking technology. The invention aims at adopting the bevel angle of a blanking line, which is obtained by computing, to perform the certification of camera shooting modes, and adopts the technical scheme that the method for shooting and taking evidence through a handheld camera comprises the following steps of: firstly, extracting linear information of an original image, secondly, positioning a corresponding blanking point according to the extracted linear information, thirdly, computing the rotation angle of a camera, and fourthly, performing the certification of shooting modes according to the rotation angle. The method is mainly applied to image forensics.

Description

technical field [0001] The invention relates to image forensics technology, belongs to the field of computer image content security, and relates to a method for calculating the rotation angle of a camera. Specifically, it relates to a method for taking evidence with a hand-held camera. Background technique [0002] With the rapid development of mobile handheld devices and the Internet, data acquisition, especially image data, has become easier and easier, but the requirements for image information processing are also getting higher and higher. Pictures are the most intuitive expression of recording culture. In addition to the intuitive information contained in the pictures, other hidden clues should also be given equal attention, such as the authentication of the way the pictures were taken. Aiming at the above problems, a general calculation method of camera rotation angle proposed by the present invention provides a feasible solution. [0003] For the detection of the pi...

Claims

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Application Information

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IPC IPC(8): G06T7/00
Inventor 操晓春姜峰李思远
Owner TIANJIN UNIV
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