CN109827659B - Full-spectrum evidence obtaining instrument and method for obtaining evidence of cambered surface - Google Patents
Full-spectrum evidence obtaining instrument and method for obtaining evidence of cambered surface Download PDFInfo
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- CN109827659B CN109827659B CN201910223381.2A CN201910223381A CN109827659B CN 109827659 B CN109827659 B CN 109827659B CN 201910223381 A CN201910223381 A CN 201910223381A CN 109827659 B CN109827659 B CN 109827659B
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Abstract
The invention relates to the technical field of trace extraction, in particular to a full spectrum evidence obtaining instrument for obtaining evidence of a cambered surface, which comprises: the full spectrum camera is used for collecting full spectrum light and imaging; the light source part comprises a parallel light source and a side light source, the parallel light source is used for emitting specific spectrum light rays parallel to the optical axis of the full-spectrum camera, and the side light source is used for flexibly adjusting an included angle between the side light source and the full-spectrum camera according to the requirements of a user and emitting the specific spectrum light rays; the adjustment part, adjustment part are used for holding the cambered surface material evidence to with the angle of full spectrum camera cooperation continuous adjustment cambered surface material evidence and light source portion, full spectrum camera still is used for handling the image of the cambered surface material evidence who obtains and obtains the cambered surface flattening drawing. The invention aims to solve the problems of light reflection and image distortion when shooting and obtaining evidence of cambered surface material evidence. The invention also discloses a full spectrum forensics method for the cambered surface forensics.
Description
Technical Field
The invention relates to the technical field of trace extraction, in particular to a full-spectrum evidence obtaining instrument and an evidence obtaining method for obtaining evidence of a cambered surface.
Background
The evidence photographic equipment (including evidence camera, camera light source, etc.) is an important equipment for further trace identification by the department of official, inspection, law, department, etc. to obtain evidence. The camera can be used for obtaining evidence of traces on objects with complex geometry and providing basis for solving a case and fixing a case, so that the material evidence camera plays an important role in the examination work of cases such as criminals, civil affairs and the like.
The case scene is various, this means that criminal technical policemen need prepare to deal with the various condition on scene when going out on-the-spot, and the latent vestige on the object surface is not imaged with natural light under many circumstances, consequently, facing changeable investigation scene, the technical staff needs to have more kinds of technical means to carry out the harmless extraction to the latent vestige material evidence on scene in the on-the-spot investigation process, when improving the investigation means, promoting investigation efficiency, hi-Tech, multi-functional, integrated investigation equipment can adapt to the needs of criminal technical development more.
In order to solve the above problems, in a document with publication number CN105242485A entitled portable potential material evidence light distribution evidence obtaining light source device and an evidence obtaining method thereof, a portable potential material evidence light distribution evidence obtaining light source device is described, which includes a lens interface, a light source housing, a lamp tube, a half mirror and a light source. The lower end of the lens interface is detachably connected with the top of the light source shell; the bottom of the light source shell is connected with the top of the lamp tube. The semi-transparent semi-reflecting mirror is obliquely arranged in the light source shell and can transmit ultraviolet rays, and the included angle between the semi-transparent semi-reflecting mirror and the horizontal plane can be adjusted within a preset range. The light source comprises a multiband surface light source and a red ultraviolet light source; the multiband surface light source is positioned on one side of the semi-transparent semi-reflecting mirror; the red ultraviolet light source is arranged below the semi-transparent semi-reflecting mirror. The top of the light source shell is provided with a filter sheet groove, and the filter sheet groove is positioned so that the filter sheet inserted into the filter sheet groove is positioned right below the joint interface. The invention also discloses a evidence obtaining method of the portable potential material evidence light distribution evidence obtaining light source device. The invention can meet the requirement of various light distribution modes required on the site of a complex crime case, and is convenient to operate and carry.
But above-mentioned device is mainly applied to the forensics of plane material evidence, when carrying out the shooting of cambered surface material evidence (be the vestige on the cylinder side) and forensics, has the problem that reflection of light, image have the distortion, is unfavorable for extracting effective image evidence.
In view of the above situation, there is an urgent need for a evidence obtaining instrument capable of obtaining evidence of the surface of the arc physical evidence.
Disclosure of Invention
The invention provides a full-spectrum evidence obtaining instrument and a method for obtaining an arc surface evidence, aiming at the problems of light reflection and image distortion when shooting and obtaining the arc surface evidence.
The basic scheme provided by the invention is as follows: a full gloss register for easy reference appearance for cambered surface is forensics includes:
the full spectrum camera is used for collecting full spectrum light and imaging;
a light source section including a collimated light source for emitting a specific spectrum light parallel to an optical axis of the full spectrum camera;
the adjusting part is used for containing the cambered surface material evidence and is matched with the full-spectrum camera to continuously adjust the angle between the cambered surface material evidence and the light source part, and the full-spectrum camera is also used for processing the obtained image of the cambered surface material evidence to obtain a cambered surface flattening image;
wherein, the parallel light source is fixedly connected or detachably connected with the full spectrum camera.
The invention has the advantages that: the angles of the arc-surface material evidence, the light source part and the full-spectrum camera are continuously adjusted through the adjusting part, so that the full-spectrum camera can acquire an image of the full-spectrum camera, wherein the angle of the arc-surface material evidence is right (a tangent line of the cross section of the arc-surface material evidence and an optical axis of the full-spectrum camera are located in the same vertical plane), and finally, a distortion-free arc-surface flattening image of the arc-surface material evidence is obtained.
Further, the light source part also comprises a side light source, the side light source is used for flexibly adjusting an included angle between the side light source and the optical axis of the full-spectrum camera according to the requirement of a user and emitting specific spectrum light, and the light measuring source is fixedly connected or detachably connected with the full-spectrum camera.
The parallel light source and the light measuring source can be respectively and independently used according to actual conditions. Certainly also can carry out the light filling of the specific spectrum light of multi-angle to the cambered surface material evidence through parallel light source and sidelight source cooperation, especially sidelight source and parallel light source cooperation, the condition that can effectual reduction reflection of light. For a camera, if the local brightness of the cambered physical evidence is much higher than that of other areas, a light spot, also called reflection, is formed in an image due to too large contrast during imaging. In the scheme, the side light source can be matched with the parallel light source, the brightness of other areas is improved, the contrast between a local area (the position right opposite to the parallel light source) and other areas is reduced, and the problems of light spots and light reflection during imaging can be effectively solved.
Further, full gloss register for easy reference camera includes camera body, camera lens and display screen, and the camera lens is fixed in the front portion of camera body, and the middle part at the camera body is connected to the display screen, and the display screen rotates with the camera body to be connected.
The display screen rotates with the camera body to be connected and conveniently accomodates and carry, is carrying out the evidence of obtaining of specific angle moreover, and this device can the person of facilitating the use observe, improves the travelling comfort, and specific angle includes lower position, needs the angle of bending over and obtaining the evidence, and such design compact structure conveniently carries and uses.
Further, the parallel light source comprises an annular parallel substrate, a short wave ultraviolet light source, a long wave ultraviolet light source, a blue light source, a green light source, a white light source and an infrared light source, the short wave ultraviolet light source, the long wave ultraviolet light source, the blue light source, the green light source, the white light source and the infrared light source are all fixed on the parallel substrate, the parallel substrate is installed at the front part of the lens, and the circle center of the parallel substrate is located on the optical axis of the lens.
In such a way, multispectral light rays coaxial with the lens can be formed, and the use by a user is convenient.
Further, the side light source is also used for forming diffuse reflection specific spectrum light with other reflecting surfaces in a matched mode, the side light source comprises a side light support rod, a side light base plate, a short wave ultraviolet light source, a long wave ultraviolet light source, a blue light source, a green light source, a white light source and an infrared light source, the short wave ultraviolet light source, the long wave ultraviolet light source, the blue light source, the green light source, the white light source and the infrared light source are all fixed on the side light base plate, the side light base plate is fixedly connected with the side light support rod, and the side light support rod is a gooseneck tube which can change with external driving force.
The angle of the side light source can be conveniently adjusted by the mode, and the side light source is conveniently matched with the parallel light source for use. The multispectral light rays which are diffusely reflected and formed by matching with other reflecting surfaces such as a wall surface, a desktop or other baffles can improve the imaging quality through simple operation.
Furthermore, the adjusting part comprises a control submodule, an objective table and a servo motor, the servo motor is fixed below the objective table and can drive the objective table to rotate, and the control submodule is used for controlling the rotating speed of the servo motor according to an instruction input by a user.
This allows for controlled rotation of the stage and ensures imaging quality.
Further, regulation portion still including being used for fixed cambered surface material evidence and making the centre of a circle of cambered surface material evidence bottom surface and the centre of rotation of objective table align's centre of rotation centering mechanism, centre gripping centering mechanism can be according to the position control height of vestige on the cambered surface material evidence.
The mode can improve imaging quality and ensure that the trace of the cambered surface material evidence can be imaged completely.
Further, the regulating part includes objective table, swinging boom and servo motor, and servo motor fixes on the objective table, and the one end and the objective table of swinging boom are connected, and servo motor drive swinging boom rotates around the objective table, and the other end of swinging boom is equipped with can carry out the holder fixed to the camera body.
In such a mode, the full spectrum camera rotates around the cambered surface material evidence on the objective table to obtain images of the cambered surface material evidence at all angles.
Furthermore, the full-spectrum evidence obtaining instrument comprises a camera body, a processing module and a storage module, wherein the camera body is used for collecting image optical signals of the cambered surface material evidence and converting the image optical signals into image electrical signals, the processing module is used for receiving the image electrical signals sent by the camera body and processing the image electrical signals into a single cambered surface image, then the single cambered surface image is cut, each picture retains a local image with less distortion in the single cambered surface image, then the local images are spliced into a cambered surface flattening image, and the processing module sends the cambered surface flattening image to the storage module for storage.
By the method, the arc surface flattening graph can be automatically generated by a single arc surface image, and the use by a user is facilitated. The meaning of each picture is that the camera shoots the pattern of the cambered surface material evidence at each angle. And cutting the single cambered surface image to obtain a local image with less distortion, and splicing the local image into a cambered surface flattening image.
A full spectrum forensics method for cambered surface forensics comprises the following steps:
s1 light processing step: irradiating multispectral light rays onto the cambered surface material evidence according to actual requirements;
s2 image acquisition step: collecting image optical signals of the cambered surface material evidence and converting the image optical signals into image electrical signals;
s3 image preprocessing step: processing the image electrical signals into a single cambered surface image, then cutting the single cambered surface image, and reserving a local image with the least distortion in the single cambered surface image for each picture;
s4 image stitching step: and splicing the partial images into an arc surface flattening diagram.
The invention has the advantages that: the automatic generation of the arc surface flattening drawing of a single arc surface image is realized, and the use by a user is facilitated. And cutting the single cambered surface image to obtain a local image, and splicing the local image into a cambered surface flattening image.
Drawings
Fig. 1 is a schematic structural diagram of a full spectrum camera in embodiment 1 of the present invention;
FIG. 2 is a schematic view of the structure of FIG. 1 from another perspective;
FIG. 3 is a partial sectional view of an object stage of another structure in example 1;
FIG. 4 is a schematic structural view of the stage with the limiting rods in an open state;
FIG. 5 is a schematic structural view of a position-limiting rod on the stage in a closed state;
fig. 6 is a schematic view of a connection structure of the full spectrum camera and the adjustment portion in embodiment 2;
FIG. 7 is a side view of the stage of example 1;
fig. 8 is a schematic view of the spatial structure of fig. 7.
Detailed Description
The following is further detailed by the specific embodiments:
reference numerals in the drawings of the specification include: the camera comprises a camera body 10, a lens 12, a display screen 13, a parallel light source 14, a side light source 15, a side light support rod 18, an object stage 20, a servo motor 21 and a limiting rod 22.
Example 1
A full gloss register for easy reference appearance for cambered surface is forensics includes: a full spectrum camera, a light source part and an adjusting part.
The full spectrum camera (as shown in fig. 1 and fig. 2) is used for collecting full spectrum light and imaging, and includes a camera body 10, a lens 12 and a display 13, the lens 12 is fixed in front of the camera body 10, and the display 13 is rotatably connected to the camera body 10 and can be turned upside down, left and right (in other preferred embodiments, fixed connection is selected).
The light source part comprises a parallel light source 14 and a side light source 15, the parallel light source 14 is used for emitting specific spectrum light rays coaxial with the optical axis of the full-spectrum camera, and the side light source 15 is used for flexibly adjusting an included angle between the side light source and the full-spectrum camera according to the requirements of a user and emitting the specific spectrum light rays. Specifically, the parallel light source 14 includes an annular parallel substrate, a short-wave ultraviolet light source, a long-wave ultraviolet light source, a blue light source, a green light source, a white light source, and an infrared light source, the short-wave ultraviolet light source, the long-wave ultraviolet light source, the blue light source, the green light source, the white light source, and the infrared light source are all fixed on the parallel substrate, the parallel substrate is installed in front of the lens 12, and the center of the parallel substrate is located on the optical axis of the lens 12. The side light source 15 comprises a side light support rod 18, a side light base plate, a short wave ultraviolet light source, a long wave ultraviolet light source, a blue light source, a green light source, a white light source and an infrared light source, wherein the short wave ultraviolet light source, the long wave ultraviolet light source, the blue light source, the green light source, the white light source and the infrared light source are all fixed on the side light base plate, the side light base plate is fixedly connected with the side light support rod 18, and the side light support rod 18 is a gooseneck tube which can change form along with external driving force.
The adjusting part is used for containing the cambered surface material evidence and is matched with the full-spectrum camera to continuously adjust the angle between the cambered surface material evidence and the light source part, and the full-spectrum camera is also used for processing the acquired image of the cambered surface material evidence to obtain a cambered surface flattening image; the adjusting part comprises a control submodule, an object stage 20 and a servo motor 21, the servo motor 21 is fixed below the object stage 20, the servo motor 21 can drive the object stage 20 to rotate, and the control submodule is used for controlling the rotating speed of the servo motor 21 according to an instruction input by a user. The adjusting part further comprises a clamping and centering mechanism for fixing the arc physical evidence and aligning the circle center of the bottom surface of the arc physical evidence with the rotation center of the object stage 20. Specifically, the centering mechanism in this embodiment includes three positioning points disposed on the object stage 20, the three positioning points form a regular triangle, a center of an inscribed circle of the regular triangle coincides with a rotation center of the object stage 20, each positioning point is hinged with a limiting rod 22, and a torsion spring is disposed between the limiting rod 22 and the object stage 20. The fixing of the arc surface material evidence can be realized through the three limiting rods 22, and whether the center of the bottom surface circle of the arc surface material evidence is aligned with the rotation center of the objective table 20 or not is conveniently adjusted and observed.
In this embodiment, an object stage 20 with another structure and a clamping and centering mechanism corresponding thereto are also disclosed, the clamping and centering mechanism is a three-jaw chuck (as shown in fig. 3) in the prior art, the three-jaw chuck includes three limiting rods 22, the limiting rods 22 are inverted L-shaped, the limiting rods 22 are slidably connected with the object stage 20, a sliding groove for sliding the limiting rods 22 is provided on the object stage 20, and the limiting rods 22 can slide along the radial direction of the object stage 20 and can also slide along the axial direction of the object stage 20, that is, the height is adjusted. The specific locking mode increases the friction between the limiting rod 22 and the object stage 20, and in this embodiment, an extruded elastic layer is arranged between the limiting rod 22 and the object stage 20, so that the friction is increased by increasing the relative pressure between the limiting rod 22 and the object stage 20, and in other embodiments, the friction coefficient between the limiting rod and the object stage can be increased. The contact part of the limiting rod 22 and the cambered surface material evidence is arranged to be an outward convex cambered surface. The restraining bar 22 is in use in both an open and closed position (shown in figures 4 and 5).
The parallel light source 14 and the light measuring source are fixedly connected or detachably connected with the full-spectrum camera respectively, the side light source 15 is also used for being matched with other reflecting surfaces to form diffuse-reflected specific spectrum light, the full-spectrum evidence obtaining instrument comprises a camera body 10, a processing module and a storage module, the camera body 10 is used for collecting image optical signals of cambered surface material evidence and converting the image optical signals into image electrical signals, the processing module is used for receiving the image electrical signals sent by the camera body 10 and processing the image electrical signals into a single cambered surface image, then the single cambered surface image is cut, each image retains local images with little distortion in the single cambered surface image, then the local images are spliced into a cambered surface flattening image, and the processing module sends the cambered surface flattening image to the storage module for storage.
Specifically, the parallel light source 14 in this embodiment adopts a multiband light source lamp set design, integrates light combinations of short-wave ultraviolet light, long-wave ultraviolet light, blue light, green light, white light, and infrared light, corresponds to the independent six-hole rotating wheel type filter set, and realizes one-to-one correspondence and one-key switching of the light sources and the filter through background software, thereby avoiding misoperation. The specific technique can be found in the document having patent No. ZL201510812700.5 by the present applicant.
The lens 12 in this embodiment is a full spectrum high definition lens 12, the light flux range of which covers the 150 nm-1100 nm band, the lens 12 is designed with a large aperture and a large light flux opening, specifically, the lens is focused at 35mm and has a maximum aperture F3.0, and the lens integrates a 3cm macro function. The camera body 10 is an ISG04M-GE scientific camera manufactured by Chongqing Rui Vision science and technology Limited, has a spectral sensing range of 150 nm-1100 nm, is sharp in imaging, has less noise and does not need to be additionally provided with a radiator. The device has HDMI and SDI dual output interfaces, and can output and play back full high definition video signals at the same time. Six groups of switchable light sources are adopted, and the light power of each group is more than or equal to 3W; six groups of switchable rotating wheel type filter disc groups are adopted, and comprise short-wave ultraviolet light, long-wave ultraviolet light, blue light, green light, white light and infrared light; the video resolution is more than or equal to 1920 multiplied by 1080 pixels and 25 sheets/second, and the photographic pixels are more than or equal to 2 million pixels; display screen 13 size: less than or equal to 5.5 inches, and the display resolution is more than or equal to 1920 multiplied by 1080 pixels; the size of the whole machine is less than or equal to 315 multiplied by 225 multiplied by 110 mm; the weight of the whole machine is less than or equal to 2 kg. The ISG04M-GE scientific camera manufactured by Chongqing Rui Vision science and technology Limited company in the embodiment comprises a processing module, and a Bluetooth module is additionally arranged on the camera to realize communication with a control sub-module in the embodiment.
The control sub-module in the embodiment selects a single chip microcomputer of STC12C5A60S2, and the servo motor 21 selects a servo motor 21 with the model number of TTSTTS.
When in specific use: firstly, whether the planar material evidence is a common planar material evidence or an arc surface material evidence (specifically, a trace formed on an arc surface of a cylinder) is determined, and if the planar material evidence is the planar material evidence, the planar material evidence can be directly used by a user in the embodiment to collect the planar material evidence. If a large area of wall surfaces or other places of a crime scene needs to be searched for whether biological traces exist or not, the parallel light source 14 or the side light source 15 can be arranged in an area needing to be detected, and after the fact that the traces exist is determined, the parallel light source 14 directly collects the biological traces. For example, after reaching a case scene, the side light source 15 and the parallel light source 14 are firstly turned on, then the type and the angle of light rays emitted by the side light source 15 are changed, for example, the short-wave ultraviolet light source is firstly turned on to detect whether grease and sweat fingerprints are shown, after the existence of a trace on the wall surface is determined, the parallel light source 14 is then turned on to collect the trace.
When the marks are left on cylindrical objects, such as glass cups, stainless steel armrests, even lipstick, and the like. At first place the central authorities of objective table 20 (being about to the axis coincidence of cambered surface material evidence in the axis when the rotation of objective table 20), then install full gloss register for easy reference camera on the swinging boom, adjust centre gripping centering mechanism's height, open parallel light source 14 and sidelight source 15, aim at cambered surface material evidence and prepare to shoot.
Then, a start instruction is sent to the control submodule, in this embodiment, the control submodule is in signal communication with the camera body 10 (specifically, in this embodiment, communication is performed through a bluetooth module), after the control submodule receives the start instruction, a signal for starting shooting is sent to the camera body 10, the servo motor 21 drives the object stage 20 to rotate, and meanwhile, the camera body 10 starts shooting (as shown in fig. 6). In other preferred embodiments, the control submodule is in signal communication with the camera body 10, and after the camera body 10 starts shooting, a start instruction is sent to the control submodule, and the servo motor 21 starts rotating. In both cases, the speed at which the servomotor 21 rotates is related to the camera body 10 to ensure that a clear single image of the arc is obtained. The servo motor 21 and the camera body 10 are adjusted through a control submodule, and the specific relation is related to the parameters of the camera body 10.
After the camera body 10 obtains a single arc image of the arc physical evidence, the single arc image is cut, each image retains a local image with little distortion in the single arc image, then the local images are spliced into an arc flattening diagram, and the processing module sends the arc flattening diagram to the storage module for storage, so that the arc flattening diagram of the arc physical evidence is obtained.
In the prior art, a picture can be stretched, but when the technology is applied to an image of a cambered physical evidence, the image can be used as a legal evidence, so that certain rigor is lacked. However, the solution provided by the invention can ensure the rigor of the evidence and ensure that the acquired image is undistorted.
The specific splicing method is also briefly described. If a PC is available, the PC loaded with PS (Photoshop) can be directly used for combing, specifically, splicing is selected in a Photomerge dialog box, and then a browse button is clicked to select a photo. The software will then automatically complete the splice. In the present embodiment, the idea related to determining the overlapping portion of each single image and then stitching the overlapping portions to obtain the arc-surface flattening diagram is applied, but the difference is that in the present embodiment, the overlapping portion is mainly completed by the camera body 10, and a specific code can be compiled by those skilled in the art by analogy with the content disclosed in the foregoing.
The embodiment discloses a full spectrum forensics method for cambered surface forensics by means of the device, which comprises the following steps:
s1 light processing step: irradiating multispectral light rays onto the cambered surface material evidence according to actual requirements;
s2 image acquisition step: collecting image optical signals of the cambered surface material evidence and converting the image optical signals into image electrical signals;
s3 image preprocessing step: the image electrical signals are processed into a single cambered image, then the single cambered image is cut, and each picture retains a local image with little distortion in the single cambered image;
s4 image stitching step: and splicing the partial images into an arc surface flattening diagram.
Example 2
Compared with the embodiment 1, the difference is only that the adjusting part comprises an object stage 20, a rotating arm and a servo motor 21, the servo motor 21 is fixed on the object stage 20, one end of the rotating arm is connected with the object stage 20, the servo motor 21 drives the rotating arm to rotate around the object stage 20 (as shown in fig. 8), the other end of the rotating arm is provided with a clamping piece capable of fixing the fixed camera body 10, and the clamping piece is specific and is in a form similar to a clamping jaw in a related product of a mobile phone support. Of course, the clamp may be detachably fixed by a fixing means such as a screw or a bolt without being limited by a name. The stage 20 is also provided with a stopper rod 22.
This can ensure the stability of the camera body 10. In practical use, portability is reduced.
Example 3
Compared with the embodiment 1, the difference is only that the embodiment is only directed at the arc physical evidence left on the regular cylinder, the adjusting part further comprises a diameter detection module, the diameter detection module is used for detecting the diameter of the arc physical evidence and feeding back the diameter to the control submodule, and the control submodule controls the rotating speed of the objective table 20 according to the diameter of the arc physical evidence. Specifically, diameter detection module is photosensitive sensor (reflective or inductive all can, reflective needs the transmitter, the inductive type is direct response illumination intensity), photosensitive sensor evenly inlays and establishes the upper surface at objective table 20 and forms three detection lines that are not parallel to each other (use objective table 20 rotation center as the centre of a circle, the initial point of three detection lines all outwards extends from this centre of a circle), when cambered surface material evidence is placed on objective table 20, control submodule is through calculating the quantity that photosensitive sensor was sheltered from, can learn the diameter of this cambered surface material evidence. The three detection lines can assist in judging whether the circle center of the cambered surface material evidence coincides with the rotation center of the objective table 20. The model number of the photosensitive sensor in this embodiment is LLS08-J, only two pins can be directly connected with the pins of the single chip, if the number is large, one driving chip can be selected, and those skilled in the art can select the photosensitive sensor according to actual situations, and details are not described herein. The servo motor 21 and the stage 20 may be optionally provided with a speed reducer according to actual conditions (i.e. the servo motor 21 may be a servo motor 21 with a speed reducing function).
In particular, this is mainly done to optimize the relationship between the rotation speed of the servo motor 21 and the camera body 10. Because the size (diameter) of the arc physical evidence has certain difference, the linear velocity of the arc physical evidence has certain difference when the angular velocity of the rotation of the servo motor 21 is constant. In the embodiment 1, the method can basically realize the purpose of obtaining the arc surface flattening diagram with clear arc surface material evidence. However, when some arc physical evidence exceeds the original technical parameters of the camera body 10, the image may be unclear (the linear velocity is too fast, and the movement is relatively fast), and at this time, the rotation speed of the servo motor 21 or the stage 20 needs to be controlled and reduced in this embodiment. The linear velocity of the cambered surface material evidence cannot be infinitely increased, because the larger the diameter of the cambered surface material evidence is, the smaller the distortion of the acquired image is, and in some cases, the change can be almost ignored, which is not the problem to be solved by the invention.
The foregoing is merely an example of the present invention, and common general knowledge in the field of known specific structures and characteristics is not described herein in any greater extent than that known in the art at the filing date or prior to the priority date of the application, so that those skilled in the art can now appreciate that all of the above-described techniques in this field and have the ability to apply routine experimentation before this date can be combined with one or more of the present teachings to complete and implement the present invention, and that certain typical known structures or known methods do not pose any impediments to the implementation of the present invention by those skilled in the art. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (8)
1. A full gloss register for easy reference appearance for cambered surface is forensics includes:
the full spectrum camera is used for collecting full spectrum light and imaging;
the method is characterized in that: the cambered surface material evidence is left on the regular cylinder; further comprising:
a light source section including a collimated light source for emitting a specific spectrum light parallel to an optical axis of the full spectrum camera;
the adjusting part is used for containing the cambered surface material evidence and is matched with the full-spectrum camera to continuously adjust the angle between the cambered surface material evidence and the light source part, and the full-spectrum camera is also used for processing the obtained image of the cambered surface material evidence to obtain a cambered surface flattening image;
wherein, the parallel light source is fixedly connected or detachably connected with the full spectrum camera;
the adjusting part comprises a control submodule, an objective table and a servo motor, the servo motor is fixed below the objective table and can drive the objective table to rotate, and the control submodule is used for controlling the rotating speed of the servo motor according to an instruction input by a user;
the adjusting part also comprises a diameter detection module, the diameter detection module is used for detecting the diameter of the cross section of the cambered surface material evidence and feeding back the diameter to the control submodule, and the control submodule controls the rotating speed of the objective table according to the diameter of the cross section of the cambered surface material evidence; the diameter detection module is a photosensitive sensor, the photosensitive sensor is uniformly embedded on the upper surface of the objective table to form three detection lines which are not parallel to each other, the rotation center of the objective table is taken as a circle center, the starting points of the three detection lines extend outwards from the circle center, and when the cambered surface physical evidence is placed on the objective table, the three detection lines are used for assisting in judging whether the central axis of the cambered surface physical evidence coincides with the rotation center of the objective table or not; the control submodule obtains the diameter of the cross section of the cambered surface material evidence by calculating the shielded number of the photosensitive sensors.
2. The full spectrum forensic instrument for arc forensics of claim 1, wherein: the light source part also comprises a side light source, the side light source is used for flexibly adjusting an included angle between the side light source and the optical axis of the full-spectrum camera according to the requirement of a user and emitting specific spectrum light, and the light measuring source is fixedly connected or detachably connected with the full-spectrum camera.
3. The full spectrum forensic instrument for arc forensics of claim 2, wherein: the full-spectrum camera comprises a camera body, a lens and a display screen, wherein the lens is fixed at the front part of the camera body, the display screen is connected to the middle part of the camera body, and the display screen is rotatably connected with the camera body.
4. The full spectrum forensic instrument for arc forensics of claim 3, wherein: the parallel light source comprises a circular parallel substrate, a short wave ultraviolet light source, a long wave ultraviolet light source, a blue light source, a green light source, a white light source and an infrared light source, the short wave ultraviolet light source, the long wave ultraviolet light source, the blue light source, the green light source, the white light source and the infrared light source are all fixed on the parallel substrate, the parallel substrate is installed at the front part of the lens, and the circle center of the parallel substrate is located on the optical axis of the lens.
5. The full spectrum forensic instrument for arc forensics of claim 4, wherein: the side light source is also used for forming diffuse-reflected specific spectrum light rays by matching with other reflecting surfaces, and comprises a side light support rod, a side light substrate, a short-wave ultraviolet light source, a long-wave ultraviolet light source, a blue light source, a green light source, a white light source and an infrared light source, wherein the short-wave ultraviolet light source, the long-wave ultraviolet light source, the blue light source, the green light source, the white light source and the infrared light source are all fixed on the side light substrate, the side light substrate is fixedly connected with the side light support rod, and the side light support rod is a gooseneck tube which can change with external driving force.
6. The full spectrum forensic instrument for arc forensics of claim 1, wherein: the adjusting part further comprises a clamping and centering mechanism which is used for fixing the cambered surface material evidence and enables the circle center of the bottom surface of the cambered surface material evidence to be aligned with the rotation center of the objective table, and the clamping and centering mechanism can adjust the height according to the position of the trace on the cambered surface material evidence.
7. The full spectrum forensic instrument for arc forensics of claim 1, wherein: the adjusting part comprises an objective table, a rotating arm and a servo motor, the servo motor is fixed on the objective table, one end of the rotating arm is connected with the objective table, the servo motor drives the rotating arm to rotate around the objective table, and the other end of the rotating arm is provided with a clamping piece capable of fixing the camera body.
8. The full spectrum forensic instrument for arc forensics of claim 1, wherein: the full-spectrum evidence obtaining instrument comprises a camera body, a processing module and a storage module, wherein the camera body is used for collecting image optical signals of arc-surface material evidence and converting the image optical signals into image electrical signals, the processing module is used for receiving the image electrical signals sent by the camera body and processing the image electrical signals into a single arc-surface image, then the single arc-surface image is cut, each picture retains a local image with little distortion in the single arc-surface image, then the local images are spliced into an arc-surface flattening image, and the processing module sends the arc-surface flattening image to the storage module for storage.
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| CN201910223381.2A CN109827659B (en) | 2019-03-22 | 2019-03-22 | Full-spectrum evidence obtaining instrument and method for obtaining evidence of cambered surface |
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| CN205210500U (en) * | 2015-10-27 | 2016-05-04 | 中国飞行试验研究院 | Machine carries camera shadow -free lighting device |
| US10798310B2 (en) * | 2016-05-17 | 2020-10-06 | Hypermed Imaging, Inc. | Hyperspectral imager coupled with indicator molecule tracking |
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