CN101889865A - Method for extracting handprints on irregular object - Google Patents
Method for extracting handprints on irregular object Download PDFInfo
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- CN101889865A CN101889865A CN2010102014759A CN201010201475A CN101889865A CN 101889865 A CN101889865 A CN 101889865A CN 2010102014759 A CN2010102014759 A CN 2010102014759A CN 201010201475 A CN201010201475 A CN 201010201475A CN 101889865 A CN101889865 A CN 101889865A
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Abstract
The invention discloses a method for extracting handprints on an irregular object, which belongs to the technical field of handprint extraction. The method organically combines optical photographing extraction with three-dimensional image technology to fuse the handprints which are remained at different positions of the irregular object by a three-dimensional model and comprises the following steps of: a, photographing the irregular object and the handprint skin lines by using a camera; and b, processing pictures obtained in step a by using computer software, building the three-dimensional model of the irregular object and performing mapping treatment on a handprint area. Compared with the prior art, the method for extracting the handprints on the irregular object has the advantages that: incomplete fragments of all partial handprints are entirely reproduced by the three-dimensional model; detection and identification can be dynamically and completely carried out by using the handprint information from all angles; the use ratio of the on-spot handprints is improved; an action target and characteristics of a criminal in a crime process can be obviously displayed; and thus, the method has a high popularization and application value.
Description
Technical field
The present invention relates to the impression of the hand extractive technique, the extracting method of impression of the hand on specifically a kind of irregular object.
Background technology
Along with the personalization day by day that decoration, finishing and furniture are made, surperficial irregular article are more and more in the daily life.In criminal case crime scene, often find to be retained in the impression of the hand on the surface imperfection object.The criminal is in commit a crime course, because the action target is different, during these irregular objects, the impression of the hand streakline of being left over can occur in different directions in contact, and most impression of the hand streakline is that be interrupted, discontinuous, leaves over several dotted region sometimes even only.Routine is taken pictures and extracted is to write down the impression of the hand streakline by fixed angle and viewpoint from a spatial direction, thereby the quantity of information that can support utilization greatly reduces naturally, all can not reach the condition that check is identified very little because of a characteristic point that photo reflected under a lot of situations.
In addition, for the impression of the hand that is retained on rotary body, the streamlined object, cylindric such as being retained in, coniform object or other edge more complicated such as the impression of the hand on the objects such as bulb, because its surface is a curved surface, thereby conventional the shooting when extracting, can only show the streakline feature of an angle by a photo, other angles be distortion otherwise be not photograph, in most cases can't finish check and identify.
Summary of the invention
Technical assignment of the present invention is at above-mentioned the deficiencies in the prior art, and a kind of extracting method with impression of the hand on the irregular object of optical pickup and dimensional Modeling Technology combination is provided.
Technical assignment of the present invention is realized in the following manner: the extracting method of impression of the hand on the irregular object may further comprise the steps:
A, optics extract
By camera irregular object and impression of the hand streakline are taken pictures;
B, digital convergence
Utilize computer software that step a gained photo is handled, set up the threedimensional model of irregular object, and pinup picture is carried out in the impression of the hand zone handle; Described computer software is a various 3 d modeling software commonly known in the art, as Photo Modeler, ImageModeler etc.
Described irregular object is many plane bodies, rotary body, edge clear polyhedron or streamlined polyhedron, wherein,
Many plane bodies refer to the object that the surface is made of the plane of different directions, different sizes, as the position, corner in house, the seamed edge of door and window, tables and chairs and all kinds of furniture surface, various packing cratess, packing box, and book, this etc.;
Rotary body refers to that the surface is the object of the surfaces of revolution, as various cylindric, coniform objects or other edge more complicated such as objects such as bulbs;
The edge clear polyhedron refers to comprise a curved surface in the surface at least, has edge lines clearly, can find the marginal object of adjacently situated surfaces clearly, as alarm clock, audio amplifier, display etc.;
Streamlined polyhedron refers to that streamlined polyhedron refers to that the surface is airflow design, ill-defined object, the shape of these type of article shows as the surface slyness, the lines flow smoothly, there are not big fluctuating and sharp-pointed corner angle, there is not tangible demarcation line between the surface, also be difficult for differentiating its each surperficial shape, as mouse, some art work etc.
Utilize camera that irregular object and impression of the hand streakline are taken pictures, generally include luminous intensity distribution, take steps such as modeling photo and shooting pinup picture photo, be specially:
Luminous intensity distribution
Shine irregular object with even soft scattered light, make each surface of irregular object obtain even illumination;
Take the modeling photo
Take the modeling photo from different perspectives, the modeling photo can intactly reflect the overall picture of irregular object, shows the features of shape of irregular object;
Take the pinup picture photo
The requirement of taking a picture according to material evidence in the position of leaving over the impression of the hand streakline on the irregular object is taken, place scale, uniform light distribution, use micro-lens, the vertical shooting, obtain clear, accurate, indeformable impression of the hand photo, to satisfy the clear purpose that manifests fingerprint on three-dimensional stereo model.
Above-mentioned image pickup method can be used for various irregular objects, but is mainly used in many plane bodies of small size and edge clear polyhedron.The many plane bodies of described small size are carried finger: each plane all is not more than the object of a hand length.After the requirement of taking a picture according to material evidence was taken whole surface, the display resolution of impression of the hand streakline can satisfy the requirement that check is identified.
For the many plane bodies of large scale, shooting process comprises sign impression of the hand zone, luminous intensity distribution, shooting modeling photo and takes the pinup picture photo, is specially:
Sign impression of the hand zone:
Under the situation of not damaging the impression of the hand streakline, the requirement that scale is taken a picture by material evidence is attached to around the impression of the hand, or other marks are placed on around the impression of the hand streakline, delimit the impression of the hand region, its objective is when making up stereomodel, to the position of this zone definite impression of the hand streakline on each plane, become face separately and carry out the pinup picture processing, to guarantee the display resolution of this zone impression of the hand streakline;
Luminous intensity distribution:
Shine irregular object with even soft scattered light, make each surface of irregular object obtain even illumination;
Take the modeling photo:
Take the modeling photo from different perspectives, the modeling photo can intactly reflect the overall picture of irregular object, shows the features of shape of irregular object;
Take the pinup picture photo:
The requirement of taking a picture according to material evidence in the position of leaving over the impression of the hand streakline on the irregular object is taken, place scale, uniform light distribution, use micro-lens, the vertical shooting, obtain clear, accurate, indeformable impression of the hand photo, to satisfy the clear purpose that manifests fingerprint on three-dimensional stereo model.
The many plane bodies of described large scale, its surface then is far longer than the size of a palm, the impression of the hand streakline of being left on it only accounts for its last very little zone, surface, after the requirement of taking a picture according to material evidence was taken whole surface, the display resolution of impression of the hand streakline can't satisfy the requirement that check is identified.
For rotary body, the process of taking pictures comprises space orientation, luminous intensity distribution, shooting modeling photo and takes the pinup picture photo, is specially:
Space orientation
Utilize the incidental space orientation standard drawing of computer software that irregular object is carried out space orientation;
Luminous intensity distribution
Shine irregular object with even soft scattered light, make each surface of irregular object obtain even illumination;
Take the modeling photo
Take the modeling photo from different perspectives, the modeling photo can intactly reflect the overall picture of irregular object, shows the features of shape of irregular object;
Take the pinup picture photo
The requirement of taking a picture according to material evidence in the position of leaving over the impression of the hand streakline on the irregular object is taken, place scale, uniform light distribution, use micro-lens, the vertical shooting, obtain clear, accurate, indeformable impression of the hand photo, to satisfy the clear purpose that manifests fingerprint on three-dimensional stereo model.
For streamlined polyhedron, the process of taking pictures comprises luminous intensity distribution, takes the pinup picture photo, irregular object is done the kinking processing and taken the modeling photo, is specially:
Luminous intensity distribution
Shine irregular object with even soft scattered light, make each surface of irregular object obtain even illumination;
Take the pinup picture photo
The requirement of taking a picture according to material evidence in the position of leaving over the impression of the hand streakline on the irregular object is taken, place scale, uniform light distribution, use micro-lens, the vertical shooting, obtain clear, accurate, indeformable impression of the hand photo, to satisfy the clear purpose that manifests fingerprint on three-dimensional stereo model;
Irregular object is made kinking to be handled
Twine some fine rules according to vertical and horizontal on irregular object, fine rule should be adjacent to the surface, and the vertical and horizontal fine rule has abundant intersection point to finish modeling;
The intersection point of vertical and horizontal fine rule is many more, and the characteristic point that makes up irregular object surface is just many more, and then the surface of Jian Liing is just accurate more.
Take the modeling photo
Take the modeling photo from different perspectives, the modeling photo can intactly reflect the overall picture of irregular object, shows the features of shape of irregular object.
In the process of above-mentioned shooting modeling photo, when can intactly reflecting the overall picture of irregular object, what the number of shooting should be tried one's best lacks.
Utilize computer software to set up threedimensional model and carry out the process that pinup picture handles to be known method, be applied to when of the present invention, this process mainly comprises following step:
(1) camera data collection.Because software is not also known actual used camera information, so need the calibration camera lens, to obtain the relevant parameter of camera, comprises 3D position, camera lens aperture, focal length and distortion etc.
(2) set up the threedimensional model of object.According to the modeling program requirement, carry out photo importing, punctuate and related, line and related, modeling computing, demonstration successively, become step such as face, form the threedimensional model of object.Many plane bodies, rotary body, edge clear polyhedron and streamlined polyhedral concrete modeling method have nothing in common with each other, and select diverse ways according to the features of shape of object and the mould mode that becomes of software during concrete operations.
(3) carry out the pinup picture processing to leaving over the impression of the hand position.After threedimensional model makes up and to finish, can do local the modification and refinement, and then the 2D image on the photo extracted as material be attached to mold surface it.Pinup picture can also can independently be specified by system according to automatic distribution is set.In the inventive method, the pinup picture of object integral body is generally carried out automatically by system, impression of the hand streakline zone then needs to set up on their own, selection requires the impression of the hand photo plaster of shooting at respective regions according to material evidence, guaranteed the true reappearance of object global shape so on the one hand, can improve the resolution of impression of the hand streakline again, satisfy the requirement that check is identified.
The extracting method of impression of the hand compared with prior art organically combines optical photographing extraction and 3-D view technology on the irregular object of the present invention, has following outstanding beneficial effect:
(1) the incomplete segment of each several part impression of the hand on the irregular object is intactly reproduced out by three-dimensional stereo model, do as a whole, the overall picture of impression of the hand is left in multi-angle, comprehensive, spatial displaying, can using with the each several part information completely, finish check and identify, improve the utilization rate of on-the-spot impression of the hand;
(2) evaluation of testing of the impression of the hand information of utilizing all angles that can be dynamic, complete, and can show action target and the feature of criminal in the crime process intuitively, by analyzing mutual relation and the model of action between the impression of the hand streakline, can also analyze criminal's behavioural habits characteristics, infer way of committing offenses and criminal's features such as height figure, not only help better carrying out the identification of individual, and, determine that the investigation direction will be very helpful for delimiting scope of investigation;
(3) impression of the hand feature and the relative position thereof that is retained on rotary body or the streamlined polyhedron can be showed accurately, the impression of the hand that is retained on rotary body or the streamlined polyhedron that has overcome the prior art extraction is difficult to finish the deficiency that check is identified.
Description of drawings
Accompanying drawing 1-1 is embodiment 1 a modeling photograph taking angle sketch map;
Accompanying drawing 1-2 is embodiment 1 a pinup picture photograph taking angle sketch map;
Accompanying drawing 1-3 is the modeling process surface chart of embodiment 1;
Accompanying drawing 1-4 is the threedimensional model of books behind the pinup picture of embodiment 1;
Accompanying drawing 2-1 is the sign impression of the hand area schematic of embodiment 2;
Accompanying drawing 2-2 is the modeling photograph taking angle sketch map of embodiment 2;
Accompanying drawing 2-3 is the pinup picture photograph taking angle sketch map of embodiment 2;
Accompanying drawing 2-4 is punctuate, the line operation chart of embodiment 2;
Accompanying drawing 2-5 is that 2 pairs of defined areas of embodiment become the face sketch map separately;
Accompanying drawing 2-6 is that embodiment 2 chooses the pinup picture area schematic;
Accompanying drawing 2-7 is the threedimensional model of desk behind embodiment 2 pinup pictures;
Accompanying drawing 3-1 is the space orientation standard drawing of embodiment 3;
Accompanying drawing 3-2 is four shooting angle sketch maps in side of embodiment 3;
Accompanying drawing 3-3 is the end face shooting angle sketch map of embodiment 3;
Accompanying drawing 3-4 is the threedimensional model of the cup after embodiment 3 pinup pictures are handled;
Accompanying drawing 4-1 is the modeling photograph taking angle sketch map of embodiment 4;
Accompanying drawing 4-2 is the pinup picture photograph taking angle sketch map of embodiment 4;
Accompanying drawing 4-3 is the 3D viewer model after 4 one-tenth faces of embodiment are handled;
Accompanying drawing 4-4 is the threedimensional model that embodiment 4 pinup pictures are handled the back alarm clock;
Accompanying drawing 5-1 is the pinup picture photograph taking angle sketch map of embodiment 5;
Accompanying drawing 5-2 is the modeling photograph taking angle sketch map of embodiment 5;
The threedimensional model of the accompanying drawing 5-3 mouse that to be embodiment 5 constructed by point;
Accompanying drawing 5-4 is the threedimensional model that embodiment 5 pinup pictures are handled the back mouse.
The specific embodiment
Explain below the extracting method of impression of the hand on the irregular object of the present invention being done with specific embodiment with reference to Figure of description.The digital convergence process is that example is introduced with Photo Modeler Pro 3 d modeling software.
Embodiment one (the many plane bodies of small size are example with books surface impression of the hand):
Concrete steps are:
1, optics extracts
1-1, luminous intensity distribution
Scattered light irradiation books with evenly soft make each surface of books obtain even illumination.
1-2, shooting modeling photo
Take respectively from both direction, every photo is the best with the plane that can intactly present three different directions, as Figure 1-1.
1-3, shooting pinup picture photo
Leave of the requirement of the plane of impression of the hand, place scale, use micro-lens, camera lens optical axis, take respectively, shown in Fig. 1-2 perpendicular to the impression of the hand plane according to the material evidence photograph.
2, digital convergence
The 2-1 camera data is gathered
The space orientation standard drawing that provides with software is an object, gathers camera data and preservation.
2-2 sets up the threedimensional model of object
The photo of taking is imported computer, carry out steps (as Figure 1-3) such as punctuate and related, line and related, modeling computing, demonstration successively, set up the threedimensional model of object.
The 2-3 pinup picture is handled
Carry out pinup picture by 3D viewer interface, software can select impression of the hand streakline clear photograph to be attached on the respective planes automatically, shown in Fig. 1-4.
Do not reach requirement if refer to the impression of the hand definition, can also be by in the 3D viewer options dialog box, the resolution adjustment function under the advanced tab improves display resolution.
Embodiment two (the many plane bodies of large scale are example with table limit impression of the hand):
Concrete steps are:
1, optics extracts
1-1, sign impression of the hand zone
Under the situation of not damaging the impression of the hand streakline, the requirement that scale is taken a picture by material evidence is attached to around the impression of the hand, delimits the impression of the hand region, shown in Fig. 2-1.
1-2, luminous intensity distribution
Scattered light irradiation desk with evenly soft makes each surface of desk obtain even illumination.
1-3, shooting modeling photo
Take the overall picture of desk from different perspectives.In order on photo, to find the point at object limit, angle exactly, should use little aperture, to obtain the big depth of field.Shown in Fig. 2-2
1-4, shooting pinup picture photo
The requirement of taking a picture according to material evidence in the impression of the hand position places scale, uses micro-lens, camera lens optical axis perpendicular to the impression of the hand plane, takes respectively, shown in Fig. 2-3.
2, digital convergence
The 2-1 camera data is gathered
Directly use embodiment 1 gained data to get final product.
2-2 sets up the threedimensional model of object
The modeling photo of taking (shown in Fig. 2-2) is carried out photo importing, punctuate and related, line and step such as related successively, adversary's plating line zone, proportionally the lines of chi mark separately, and carry out association, shown in Fig. 2-4.Set up the threedimensional model (when being carried out to the face operation, should note the independent one-tenth face in zone that the Comparative Examples chi delimited, shown in Fig. 2-5) of object.
2-3 carries out the pinup picture processing to leaving over the impression of the hand position
After the impression of the hand region chosen, the right button of clicking the mouse was chosen properties of selected option, by the material/layer function, selected the impression of the hand photo of close-up photography to carry out pinup picture and handled, shown in Fig. 2-6.
Finger-print region on the different angles plane is carried out respectively obtaining impression of the hand and meeting the 3D model that the object overall picture that requires is identified in check, shown in Fig. 2-7 after pinup picture handles.
Embodiment three (rotary body is an example with the impression of the hand on the bottle cap):
Concrete steps are:
1, optics extracts
1-1, space orientation
Utilize the incidental space orientation standard drawing of computer software that irregular object is carried out space orientation, that is, bottle cap is put on the printed space orientation standard drawing.The space orientation standard drawing is that software is incidental, shown in accompanying drawing 3-1.
1-2, luminous intensity distribution
Scattered light irradiation bottle cap with evenly soft makes each surface of bottle cap obtain even illumination;
1-3, shooting modeling photo
From five angle shots: wherein four angles keep flat and clap and over against the bottle cap side, adjacent two photograph taking angles are separated by 90 °, and such four photos just can intactly show the overall picture all around of bottle cap, shown in Fig. 3-2; Also have an angle to take from the direction over against the bottle cap end face, the characteristics at reflection bottle cap top are shown in Fig. 3-3.
1-4, shooting pinup picture photo
If object is bigger, then should take closeup photograph to the impression of the hand zone according to the requirement that material evidence is taken a picture, with handle by the later stage pinup picture obtain can clear demonstration impression of the hand streakline the 3D model.And in the present embodiment, the volume of bottle cap is less, and utilizing the modeling photo of having taken to carry out the pinup picture processing is enough to satisfy the clear purpose that manifests fingerprint on three-dimensional stereo model, so this step can be omitted.
2, digital convergence
The 2-1 camera data is gathered
Directly use embodiment 1 gained data to get final product.
2-2 sets up the threedimensional model of object
The modeling photo of taking (shown in Fig. 3-2, Fig. 3-3) is carried out photo importing, punctuate and related, line and related, modeling computing, demonstration successively, becomes step such as face, set up the threedimensional model of bottle cap.
The 2-3 pinup picture is handled
Utilization meets the photo of pinup picture requirement, carries out pinup picture and handles, as shown in Figure 3-4.
Embodiment four (the edge clear polyhedron is an example with the impression of the hand on the alarm clock):
Concrete steps are:
1, optics extracts
1-1, luminous intensity distribution
Scattered light irradiation alarm clock with evenly soft makes each surface of alarm clock obtain even illumination.
1-2, shooting modeling photo
From different angles its each surface is taken, so that can set up the 3D model of object preferably, shown in Fig. 4-1.
1-3, shooting pinup picture photo
To the requirement of taking a picture according to material evidence in the impression of the hand position, place scale, use micro-lens, camera lens optical axis perpendicular to the impression of the hand surface, take respectively, shown in Fig. 4-2.
2, digital convergence
The 2-1 camera data is gathered
Directly use embodiment 1 gained data to get final product.
2-2 sets up the threedimensional model of object
The modeling photo of taking (shown in Fig. 4-1) is carried out photo importing, punctuate and related, line and related, modeling computing, demonstration successively, becomes step such as face, shown in Fig. 4-3, set up the threedimensional model of object.
2-3 carries out the pinup picture processing to leaving over the impression of the hand position
The pinup picture photo of taking is imported, finish pinup picture by 3D viewer interface, shown in Fig. 4-4.
Embodiment five (streamlined polyhedron is an example with the impression of the hand on the mouse):
Concrete steps are:
1, optics extracts
1-1, luminous intensity distribution
Scattered light irradiation mouse with evenly soft makes each surface of mouse obtain even illumination;
1-2, shooting pinup picture photo
Take one group of mouse photo according to the requirement that material evidence is taken a picture, the original looks of record mouse are used for carrying out after model construction is finished pinup picture simultaneously and handle, shown in Fig. 5-1.
1-3, mouse is made kinking handle
Twine some fine rules according to vertical and horizontal on irregular object, fine rule should be adjacent to the surface, and the vertical and horizontal fine rule has abundant intersection point to finish modeling.
1-4, shooting modeling photo
Take the modeling photo from different perspectives, intactly reflect the overall picture of mouse, shown in accompanying drawing 5-2.
2, digital convergence
The 2-1 camera data is gathered
Directly use embodiment 1 gained data to get final product.
2-2 sets up the threedimensional model of object
The modeling photo of taking (shown in Fig. 5-2) is carried out photo successively imports, to all photos carry out punctuate with related after, obtain the threedimensional model of the mouse constructed by point, shown in Fig. 5-3.Utilize CreatePoint Cloud from selection (the becoming face automatically) method of software, generate the surface that constitutes by institute's reconnaissance by the point of choosing.
2-3 carries out the pinup picture processing to leaving over the impression of the hand position
After setting up each surface, choose each surface respectively, utilize the pinup picture photo that it is carried out pinup picture one by one and handle, just can obtain the threedimensional model of mouse, shown in Fig. 5-4.
Claims (5)
1. the extracting method of impression of the hand on the irregular object may further comprise the steps:
A, optics extract
By camera irregular object and impression of the hand streakline are taken pictures;
B, digital convergence
Utilize computer software that step a gained photo is handled, set up the threedimensional model of irregular object, and pinup picture is carried out in the impression of the hand zone handle;
Described irregular object is many plane bodies, rotary body, edge clear polyhedron or streamlined polyhedron, wherein,
Many plane bodies refer to the object that the surface is made of different directions, different big or small plane;
Rotary body refers to that the surface is the object of the surfaces of revolution;
The edge clear polyhedron refers to comprise a curved surface in the surface at least, has edge lines clearly, can find the marginal object of adjacently situated surfaces clearly;
Streamlined polyhedron refers to that the surface is airflow design, ill-defined object.
2. the extracting method of impression of the hand is characterized in that on the irregular object according to claim 1, and step a comprises luminous intensity distribution, takes the modeling photo and takes the pinup picture photo, is specially:
Luminous intensity distribution:
Shine irregular object with even soft scattered light, make each surface of irregular object obtain even illumination;
Take the modeling photo:
Take the modeling photo from different perspectives, the modeling photo can intactly reflect the overall picture of irregular object, shows the features of shape of irregular object;
Take the pinup picture photo:
The requirement of taking a picture according to material evidence in the position of leaving over the impression of the hand streakline on the irregular object is taken, place scale, uniform light distribution, use micro-lens, the vertical shooting, obtain clear, accurate, indeformable impression of the hand photo, to satisfy the clear purpose that manifests fingerprint on three-dimensional stereo model.
3. the extracting method of impression of the hand is characterized in that on the irregular object according to claim 2, and step a comprises sign impression of the hand zone, luminous intensity distribution, shooting modeling photo and takes the pinup picture photo, is specially:
Sign impression of the hand zone:
Under the situation of not damaging the impression of the hand streakline, the requirement that scale is taken a picture by material evidence is attached to around the impression of the hand, or other marks are placed on around the impression of the hand streakline, delimits the impression of the hand region;
Luminous intensity distribution:
Shine irregular object with even soft scattered light, make each surface of irregular object obtain even illumination;
Take the modeling photo:
Take the modeling photo from different perspectives, the modeling photo can intactly reflect the overall picture of irregular object, shows the features of shape of irregular object;
Take the pinup picture photo:
The requirement of taking a picture according to material evidence in the position of leaving over the impression of the hand streakline on the irregular object is taken, place scale, uniform light distribution, use micro-lens, the vertical shooting, obtain clear, accurate, indeformable impression of the hand photo, to satisfy the clear purpose that manifests the impression of the hand streakline on three-dimensional stereo model.
4. the extracting method of impression of the hand is characterized in that on the irregular object according to claim 2, and step a comprises space orientation, luminous intensity distribution, shooting modeling photo and takes the pinup picture photo, is specially:
Space orientation:
Utilize the incidental space orientation standard drawing of computer software that irregular object is carried out space orientation;
Luminous intensity distribution:
Shine irregular object with even soft scattered light, make each surface of irregular object obtain even illumination;
Take the modeling photo:
Take the modeling photo from different perspectives, the modeling photo can intactly reflect the overall picture of irregular object, shows the features of shape of irregular object;
Take the pinup picture photo:
The requirement of taking a picture according to material evidence in the position of leaving over the impression of the hand streakline on the irregular object is taken, place scale, uniform light distribution, use micro-lens, the vertical shooting, obtain clear, accurate, indeformable impression of the hand photo, to satisfy the clear purpose that manifests fingerprint on three-dimensional stereo model.
5. the extracting method of impression of the hand is characterized in that on the irregular object according to claim 2, and step a comprises luminous intensity distribution, takes the pinup picture photo, irregular object is done the kinking processing and taken the modeling photo, is specially:
Luminous intensity distribution:
Shine irregular object with even soft scattered light, make each surface of irregular object obtain even illumination;
Take the pinup picture photo:
The requirement of taking a picture according to material evidence in the position of leaving over the impression of the hand streakline on the irregular object is taken, place scale, uniform light distribution, use micro-lens, the vertical shooting, obtain clear, accurate, indeformable impression of the hand photo, to satisfy the clear purpose that manifests fingerprint on three-dimensional stereo model;
Irregular object is made kinking to be handled:
Twine some fine rules according to vertical and horizontal on irregular object, fine rule should be adjacent to irregular object surface, and the vertical and horizontal fine rule has abundant intersection point to finish modeling;
Take the modeling photo:
Take the modeling photo from different perspectives, the modeling photo can intactly reflect the overall picture of irregular object, shows the features of shape of irregular object.
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| CN2010102014759A CN101889865A (en) | 2010-06-17 | 2010-06-17 | Method for extracting handprints on irregular object |
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| CN2010102014759A CN101889865A (en) | 2010-06-17 | 2010-06-17 | Method for extracting handprints on irregular object |
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| CN104068863A (en) * | 2013-03-26 | 2014-10-01 | 上海市刑事科学技术研究院 | Photographing device for forensic science rough surface fingerprint evidence and photographing method thereof |
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| CN104068863B (en) * | 2013-03-26 | 2016-05-25 | 上海市刑事科学技术研究院 | Photographic means and the photographic means thereof of the evidence obtaining of forensic science rough surface finger mark |
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