CN201057559Y

CN201057559Y - Device for implementing bar code recognition by PC camera

Info

Publication number: CN201057559Y
Application number: CNU2006201563512U
Authority: CN
Inventors: 张德富
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-11-21
Filing date: 2006-11-21
Publication date: 2008-05-07
Anticipated expiration: 2016-11-21

Abstract

The utility model relates to a device which realizes the readability of bar codes through a PC camera; the device comprises a shell made of non-transparent materials and a removable PC camera arranged in the shell, wherein the shell is also provided with an auxiliary light source composed of one group or multiple groups of scattering light sources, the fixed position distance to the PC camera of the front end of the shell is provided with a readability window made of transparent materials, the PC camera is provided with a focus determining device, and the auxiliary light source is composed of one group or multiple groups of scattering light sources and controlled by a photosensitive switch; the utility model combines the common PC camera with the special shell to solve the problems of focus adjustment and light interference, which greatly reduces the cost and has also very convenient operation; the utility model not only can be used in the technology field of readability of bar codes, but also can be used in the technology field of readability of other image signals.

Description

A kind of device that utilizes the PC camera to realize bar code recognition

Technical field:

The utility model relates to a kind of recognition telltale, especially a kind of device that utilizes the PC camera to realize bar code recognition.

Background technology:

Along with the widespread use of electronic product, increasing occasion need read the information of various images, along with bar code progressively in the application in internet and WVAS field.Various identifications are printed on printed matter, the barcode recognition equipment of reflective equipment is not developed in succession, in addition, use the professional bar code scan equipment of (as showing bar code) at internet and WVAS field specially and also occurring on the market, but the scanning device of specialty costs an arm and a leg by mobile phone and portable terminal.Seriously influenced the popularization of barcode technology in the WVAS field.

Summary of the invention:

The purpose of this utility model is to provide a kind of device of the PC of utilization camera reading images signal, and its cost is low, and is easy to use.

For reaching above-mentioned purpose, the utility model adopts following technical scheme:

A kind of device that utilizes the PC camera to realize bar code recognition, described device comprises a shell, dismountable setting PC camera in the enclosure, establish one group or organize the secondary light source that scattering light source is formed more in the shell in addition, be provided with one recognition window in the front end distance P C of shell camera fixed position.

Described PC camera is provided with focal length and determines device.

Described focal length determines that device is the camera lens circle, its spacing certain direction focal length stretching distance of fixing.

Described focal length determines that device is a mould, its spacing certain direction focal length stretching distance of fixing.

Secondary light source is one group or organizes scattering light source more and form, and adopts light activated switch control secondary light source.

Secondary light source is asymmetric to the camera center.

The position of every group of secondary light source is positioned at the line segment vertical projection that forms with cam lens, secondary light source on the same plane of identification window, and the mid point of projection line segment exceeds identification window.

Adopt technique scheme, the utility model utilizes common PC camera and special shell etc. to combine, and has solved focus adjustment problem and light interference problem, and the cost of the specialized equipment of Jiang Diing is operated also very convenient greatly.

Description of drawings:

Fig. 1 is the utility model structural representation;

Fig. 2 is the utility model PC camera structure synoptic diagram;

Fig. 3 is the utility model secondary light source fundamental diagram;

Fig. 4 is the utility model identification window and the secondary light source location drawing.

Embodiment:

Below in conjunction with drawings and Examples the utility model is described in further detail.

As shown in Figure 1, a kind of device that utilizes the PC camera to realize bar code recognition, described device comprises:

Shell 1 is light-proof material, and main effect is fixing PC camera, and utilizes height of self and the identification window opened of top to make things convenient for the user to be distinguished object to be placed on the optimum position.

PC computer 2 is used for the image that operating software is handled the subject that passes over from the PC camera, and identifies the bar code information content from image.

Secondary light source 3 is used for the subject insufficient light and can not gives additional light source under the situation of camera normal photographing, the flashlamp of similar camera.

PC camera 4, form by camera lens, photosensitive material, picture processing chip and shell, finish the collection of image and be converted to digital signal and by connecting line the image transfer that is taken in the PC computer, supply is with the program software display image or be for further processing.

Connecting line 5 is used to connect PC camera and PC computer, and the image transfer that the PC camera is taken is in the PC computer.

Be identified object 6 as printed matter, mobile phone screen, mobile terminal screen etc.Print bar code above or shown bar code.

Identification window 7 has been opened the identification window of a fixed measure at the top of shell.This window form of expression is high transparent glass.

As shown in Figure 2, be the structural representation of the utility model PC camera 4,

PC camera of the present utility model has two kinds of mode of operations.Pattern one is placed on outside the identification equipment casing.Camera as purposes such as chats uses.Pattern two is placed in the identification equipment casing and casing, secondary light source, PC computer, connecting line, identification window etc. are formed a cover barcode recognition equipment.

Described PC camera 4 comprises:

Photosensitive material 41 is responsible for the light that sees through camera lens is carried out opto-electronic conversion.

The recognition mode lens focus is determined device 42, can show as camera lens circle or other equipment.Camera lens physics in the focusing process show as in lens mount near or away from photosensitive material.The maximum difference of recognition mode and common chat pattern is the distance of imaging object from camera.Object in the visual field that recognition mode is taken is several square centimeters.And the visual field that the chat pattern the is taken object of tens square centimeters in head portrait etc. normally.Therefore under two kinds of mode of operations, relate to the focusing process again of camera lens.Common chat process user can adjust the focal length of camera according to the clear picture degree that computer shows.And recognition mode is too little owing to the object that is taken, and is made up of a large amount of intensive staggered point or lines of black and white, if not accurate the focusing, the image that is taken can not restore the information of original bar code clearly.The client focuses according to image again if desired, and the operating cycle is oversize, and operation is very inconvenient.The distance that therefore can adopt the prior camera lens of measuring under the identification optimal cases to leave photosensitive material is determined device for the focal length that the basis makes.Such as but be not restricted to the camera lens circle, camera lens is away from photosensitive material when clockwise rotating, camera lens is near photosensitive material when rotating counterclockwise.To use the camera lens circle to be fixed up away from the maximum position of camera lens, and this position just in time be the optimum distance of recognition mode.As long as the user clockwise rotates camera lens to recognition mode the time till can not rotate from common chat mode switch like this.

Camera lens 43 is responsible for the light of gathering the subject reflection or launching from the external world.

Lens mount 44, fixed lens, and the track of camera adjusting is provided.

Head shell 45 holds devices such as fixed lens, lens mount, photosensitive material, process chip and peripheral circuit.The recognition mode lens focus determines that device can be installed in the head shell, also can be installed in other positions.

Process chip and peripheral circuit 46 are handled the signal import and by the signal wire with the PC computer digital signal are exported in the computer from photosensitive material.

As Fig. 3, the utility model secondary light source fundamental diagram:

Be identified object 6, printed matter or mobile phone screen and mobile terminal screen etc.

Direct reflection light 8, object such as the mobile phone screen glass-mirror reflection of the light of secondary light source 3 emissions through being taken.

Diffuse light 9, the object diffuse reflection of light through being taken of secondary light source emission.

Identification window 7, shell are light-proof material, and identification window is a light transmissive material, and both have limited the scope of light-permeable jointly.

Camera 4 is taken the object that shows or be printed with bar code.

Secondary light source 3 is because the recognizing apparatus shell is a light-proof material.When subject is not reflective printed matter or luminous deficiency, the camera imaging effect is poor.Therefore adopt light-operated secondary light source, insufficient light in housing, secondary light source emits beam, and light is by mode effect and subjects such as reflection and direct projections.Secondary light source be chosen as scattering light source, and choice of location can not allow the light of its emission be identified directly to enter cam lens in a large number after the direct reflection of the serious subject of window glass and direct reflection and influences shooting effect.

As shown in Figure 4, the utility model identification window and the secondary light source location drawing:

Cam lens position 4.

Secondary light source position 3

Secondary light source is projected position 3 ' on the identification window plane.

Cam lens is projected position 4 ' on the identification window plane.

The line segment that cam lens and secondary light source form is at the mid point 10 of identification window plane projection.

The light 11 of secondary light source emission.

Secondary light source is at identification window position direct reflection light 12.

In order to prevent that the glass of secondary light source in the identification window position from entering cam lens in a large number with the direct reflection light that is identified the generation of object screen glass and causing the actual photographed object to be shrouded and can not distinguish by a hickie.

Adopt technique scheme, the utility model utilizes common PC camera and special shell etc. to combine, and has solved focus adjustment problem and light interference problem, and the cost of Jiang Diing is operated also very convenient greatly.

The utility model not only can utilize in the bar code reading technical field, also can be used in the technical field of other recognition picture signal.

Claims

1. one kind is utilized the PC camera to realize the device that bar code is distinguished, it is characterized in that: described device comprises a shell, dismountable setting PC camera in the enclosure, establish one group or organize the secondary light source that scattering light source is formed more in the shell in addition, be provided with a recognition window in the front end distance P C of shell camera fixed position.

2. a kind of device that utilizes the PC camera to realize bar code recognition as claimed in claim 1, it is characterized in that: described PC camera is provided with focal length and determines device.

3. a kind of device that utilizes the PC camera to realize bar code recognition as claimed in claim 2, it is characterized in that: described focal length determines that device is the camera lens circle, its spacing certain direction focal length stretching distance of fixing.

4. a kind of device that utilizes the PC camera to realize bar code recognition as claimed in claim 2, it is characterized in that: described focal length determines that device is a mould, its spacing certain direction focal length stretching distance of fixing.

5. as claim 1,2,3 or 4 described a kind of devices that utilize the PC camera to realize bar code recognition, it is characterized in that: secondary light source is one group or organizes scattering light source more and form, and adopts light activated switch control secondary light source.

6. a kind of device that utilizes the PC camera to realize bar code recognition as claimed in claim 5, it is characterized in that: secondary light source is asymmetric to the camera center.

7. as claim 1,2,3 or 4 described a kind of devices that utilize the PC camera to realize bar code recognition, it is characterized in that: the position of every group of secondary light source is positioned at the line segment vertical projection that forms with cam lens, secondary light source on the same plane of identification window