CN201533831U

CN201533831U - Non-contact type centrometer

Info

Publication number: CN201533831U
Application number: CN2009202561293U
Authority: CN
Inventors: 夏来德
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-11-17
Filing date: 2009-11-17
Publication date: 2010-07-28
Anticipated expiration: 2019-11-17

Abstract

The utility model relates to a non-contact type centrometer, which structurally comprises a CPU core-board interface circuit, a CCD image acquisition circuit, a reference laser cursor circuit, a key circuit, a data storage circuit, an LCD liquid crystal display circuit, a flashlight light source circuit, a power source, a charging circuit, a programming circuit and a reset circuit. The non-contact type centrometer has the advantages that the centrometer does not contact with a tested person completely so as to thoroughly avoid possible pathophoresis, and testing personnel can operate in a handheld form, thereby avoiding embarrassed postures when utilizing a traditional interpupillary distance measuring scale and a contact type centrometer. In addition, the non-contact type centrometer utilizes a high-speed digital image processing chip, and is faster and more accurate in data processing. Measured results are more accurate and reliable. Moreover, the non-contact type centrometer can be used for replacing the traditional interpupillary distance measuring scale and the common contact type centrometer.

Description

Contactless centrometer

Technical field:

What this utility model was related is contactless centrometer, belongs to optometry and joins the optometry of mirror industry and join the mirror device technical field.

Background technology:

In order to carry out the glasses preparation, the interpupillary distance that eyes are measured on accurate science ground is to cause the pass important step with holding water.Traditional way is to use ruler directly to measure, afterwards, common centrometer has appearred again, though common centrometer is to measure, above dual mode can produce subjective error all inevitably, and, ruler or common centrometer all can contact different persons under inspection inevitably in the measuring process, and be like this, both unhygienic also inconvenient.Sometimes also can produce embarrassment beyond description.

Summary of the invention:

The utility model proposes a kind of contactless centrometer, be intended to realize conveniently, accurately, fast, scientifically carrying out the measurement of interpupillary distance.Thoroughly overcome the contact defective in traditional ruler measurement and the measurement of common centrometer, and avoid the inconvenience of the measurement posture in traditional ruler measurement and the measurement of common centrometer fully; And, increase substantially the degree of accuracy that interpupillary distance is measured.

Technical solution of the present utility model: its structure is the first output/input of core cpu plate circuit and corresponding the joining of I/O end of ccd image Acquisition Circuit, corresponding the joining of I/O end of the second output/input of core cpu plate circuit and instrument key circuit, corresponding the joining of I/O end of the 3rd output/input of core cpu plate circuit and instrument data memory circuit, corresponding the joining of outfan of the first input end of core cpu plate circuit and power circuit, corresponding the joining of outfan of second input of core cpu plate circuit and program burn writing circuit, corresponding the joining of outfan of the 3rd input of core cpu plate circuit and electrify restoration circuit, corresponding the joining of input of first outfan of core cpu plate circuit and light source for instrument circuit, corresponding the joining of input of second outfan of core cpu plate circuit and reference laser cursor generation circuit, corresponding the joining of input of the 3rd outfan of core cpu plate circuit and LCD liquid crystal display circuit.

Advantage of the present utility model: instrument does not contact fully with the measured, thereby has thoroughly avoided contingent pathophoresis, and the tester can adopt handheld operation, thus the awkward posture when having avoided traditional interpupillary distance rule and contact centrometer to use.Adopt novel high speed Digital Image Processing chip, date processing is faster more accurate.Measurement result also just more accurately and reliably.Can be widely used in, the mirror industry is joined in the eyes optometry, is used for the measurement of eye pupil distance.Can be used for substituting traditional interpupillary distance rule and substitute common centrometer.

Description of drawings

Accompanying drawing 1 is the structural representation of contactless centrometer.

Among the figure 1 is core cpu plate circuit, the 2nd, ccd image Acquisition Circuit, the 3rd, reference laser cursor generation circuit, the 4th, LCD liquid crystal display circuit, the 5th, instrument key circuit, the 6th, instrument data memory circuit, the 7th, light source for instrument circuit, the 8th, power circuit, the 9th, program burn writing circuit, the 10th, electrify restoration circuit.

The specific embodiment

Contrast accompanying drawing 1, its structure is the first output/input of core cpu plate circuit 1 and corresponding the joining of I/O end of ccd image Acquisition Circuit 2, corresponding the joining of I/O end of the second output/input of core cpu plate circuit 1 and instrument key circuit 5, corresponding the joining of I/O end of the 3rd output/input of core cpu plate circuit 1 and instrument data memory circuit 6, corresponding the joining of outfan of the first input end of core cpu plate circuit 1 and power circuit 8, corresponding the joining of outfan of second input of core cpu plate circuit 1 and program burn writing circuit 9, corresponding the joining of outfan of the 3rd input of core cpu plate circuit 1 and electrify restoration circuit 10, corresponding the joining of input of first outfan of core cpu plate circuit 1 and light source for instrument circuit 7, corresponding the joining of input of second outfan of core cpu plate circuit 1 and reference laser cursor generation circuit 3, corresponding the joining of input of the 3rd outfan of core cpu plate circuit 1 and LCD liquid crystal display circuit 4.

Core cpu plate interface circuit 1 adopts Samsung processor S3C2440, and S3C2440 adopts the ARM920T kernel can satisfy the requirement of real time imaging rapid extraction computing, and this circuit is achieved as follows function: response user's button operation.Program operation and sound, light prompting.Gather and read ccd image, then ccd image is carried out the view data processing and comprise the gray processing processing, feature extraction and definite measured's pupil position, determine reference light target size, and then calculate the actual range of measured's pupil according to pupil position in the image and benchmark cursor magnitude proportion.Send in real time and record the result to the LCD liquid crystal display.

Ccd image Acquisition Circuit 2, the function of realization are that ccd image is gathered and sent to the core cpu plate in real time and handles.CPU S3C2440 has CAMERRA interface (S3C2440-GPIO-J) can external various digital cameras.

Reference laser cursor generation circuit 3, the function of realization is: under the control of CPU, generate the reference laser cursor according to predetermined mode, preset time, shine near the facial eyeball of measured.Carry out the basis of reference that interpupillary distance is calculated in order to digital camera collection conduct.

LCD liquid crystal display circuit 4 provides the interface of CPU to the LCD liquid crystal display.The LCD module adopts STN8X2 character mode lcd display.And directly drive by CPU GPIO mouth (S3C2440-GPIO-C).

Centrometer button 5, storage and relevant indicating circuit, key circuit has been realized the response of CPU to user key-press.When normal operation of program and operation, CPU indicates to realize corresponding acousto-optic buzzer and the control of LED lamp.Some pre-set parameters that memory circuit can be preserved the user are as brightness fiducial value etc.Button (K1:S3C2440-GPIO-F1 wherein, K2:S3C2440-GPIO-F4), buzzer (S3C2440-GPIO-B0), LED (S3C2440-GPIO-B5) lamp is connected with CPU by the GPIO mouth, memory circuit adopt 24C02 and by the I2C interface (SCL:S3C2440-GPIO-E14, SDA:S3C2440-GPIO-E15) and CPU carry out communication.

Power supply, the power pack in program burn writing and the electrify restoration circuit 6 can adopt aneroid battery or external power adapter power supply.The program burn writing interface adopts jtag interface can realize writing of centrometer CPU program.Electrify restoration circuit (S3C2440-H16) can be realized the switch of the centrometer operate as normal that powers on.

During instrument work:

Machine powers on, instrument enters holding state, in case touch trigger switch, promptly sends work order, at this moment, the CCD imaging system is gathered measured's facial information figure, and sends DMP to, and DMP is according to the signal that obtains, calculate measured's interpupillary distance rapidly, and these data are sent to the demonstration charactron, and come out now. because measured's interpupillary distance image and reference light are marked on a map similarly is synchronous acquisition, so avoided owing to the measured does not fix the error that produces.

Utilize the CCD imaging technique, by the DMP image processor, facial information to the measured that CCD collected is calculated, is analyzed, and again according to two interpupillary distances of measured in the image and reference light target relative scale, and then calculates measured's two interpupillary accurate distances.

Claims

1. contactless centrometer, it is characterized in that the first output/input of core cpu plate circuit and corresponding the joining of I/O end of ccd image Acquisition Circuit, corresponding the joining of I/O end of the second output/input of core cpu plate circuit and instrument key circuit, corresponding the joining of I/O end of the 3rd output/input of core cpu plate circuit and instrument data memory circuit, corresponding the joining of outfan of the first input end of core cpu plate circuit and power circuit, corresponding the joining of outfan of second input of core cpu plate circuit and program burn writing circuit, corresponding the joining of outfan of the 3rd input of core cpu plate circuit and electrify restoration circuit, corresponding the joining of input of first outfan of core cpu plate circuit and light source for instrument circuit, corresponding the joining of input of second outfan of core cpu plate circuit and reference laser cursor generation circuit, corresponding the joining of input of the 3rd outfan of core cpu plate circuit and LCD liquid crystal display circuit.