CN201431445Y

CN201431445Y - Non-contact centrometer

Info

Publication number: CN201431445Y
Application number: CN2009200428428U
Authority: CN
Inventors: 夏来德
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-06-26
Filing date: 2009-06-26
Publication date: 2010-03-31
Anticipated expiration: 2019-06-26

Abstract

The utility model relates to a non-contact centrometer, which comprises a CPU core board interface circuit, a CCD image acquisition circuit, a circuit for measuring the distance between a human face and a CCD camera, a centrometer button circuit, a centrometer data memory circuit, a LCD liquid crystal display circuit, a centrometer light source circuit, a power circuit, a program writting circuitand a power-on reset circuit. The utility model has the advantages that the centrometer is not fully contacted with the tested persons so as to completely prevent the spread of possible diseases, andthe testing personnel can adopt handheld operation so as to prevent the embarrassing posture when the traditional interpupillary distance measuring ruler and the contact centrometer are used; in addition, the utility model adopts a novel high-speed digital image processing chip, so that the data processing is faster and more accurate, and the measurement result is more accurate and more reliable;and the utility model can be widely used in optometry for measuring the interpupillary distance, and can be used for replacing the traditional interpupillary distance measuring ruler and the common centrometer.

Description

Contactless centrometer

Technical field:

What this utility model was related is contactless centrometer, belongs to the optometry equipment technical field that the mirror industry is joined in optometry.

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, can make things convenient for, accurately, fast, scientifically carry 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 interface circuit and corresponding the joining of I/O end of ccd image Acquisition Circuit, second output/input of core cpu plate interface circuit and I/O end corresponding join of people's face to the range measurement circuit between the CCD photographic head, corresponding the joining of I/O end of the 3rd output/input of core cpu plate interface circuit and centrometer key circuit, corresponding the joining of I/O end of the 4th output/input of core cpu plate interface circuit and centrometer data storage circuitry, first outfan of core cpu plate interface circuit 1 and the input of LCD liquid crystal display circuit join, second outfan of core cpu plate interface circuit 1 and the input of centrometer circuit of light sources join, the first input end of core cpu plate interface circuit and the outfan of power circuit join, second input of core cpu plate interface circuit and the outfan of program burn writing circuit join, and the 3rd input of core cpu plate interface circuit and the outfan of electrify restoration circuit join.

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.In addition, this utility model adopts novel high speed Digital Image Processing chip, and 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 electric functional-block diagram of contactless centrometer.

The specific embodiment

Contrast Fig. 1, its structure is the first output/input of core cpu plate interface circuit 1 and corresponding the joining of I/O end of ccd image Acquisition Circuit 2, second output/input of core cpu plate interface circuit 1 and I/O end corresponding join of people's face to the range measurement circuit 3 between the CCD photographic head, corresponding the joining of I/O end of the 3rd output/input of core cpu plate interface circuit 1 and centrometer key circuit 5, corresponding the joining of I/O end of the 4th output/input of core cpu plate interface circuit 1 and centrometer data storage circuitry 6, first outfan of core cpu plate interface circuit 1 and the input of LCD liquid crystal display circuit 4 join, second outfan of core cpu plate interface circuit 1 and the input of centrometer circuit of light sources 7 join, the first input end of core cpu plate interface circuit 1 and the outfan of power circuit 8 join, second input of core cpu plate interface circuit 1 and the outfan of program burn writing circuit 9 join, and the 3rd input of core cpu plate interface circuit 1 and the outfan of electrify restoration circuit 10 join.

Described core cpu plate interface circuit 1, this core adopt 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 and measure the distance of CCD photographic head to people's face, then ccd image is carried out the view data processing and comprise the gray processing processing, feature extraction is also determined human eye, the position of the bridge of the nose, and then calculate the distance of human eye reality to the distance of people's face according to the CCD photographic head.Send facial image in real time and record the result to the LCD liquid crystal display.

Described ccd image Acquisition Circuit 2 and people's face be to the range measurement circuit 3 between the CCD photographic head, and partial circuit is realized 2 functions, and one of them function is that ccd image is gathered and sent to the core cpu plate in real time and handles.Another function is to record the distance of photographic head to people's face, so that the reference frame of calculating actual range to be provided.CPU S3C2440 has CAMERRA interface (S3C2440-GPIO-J) can external various digital cameras, the range measurement circuit adopts the ultrasonic ranging principle, (TXD1:S3C2440-GPIO-H4 RXD1:S3C2440-GPIO-H5) reads the result of measurement to CPU S3C2440 by serial ports RS232.

Described LCD liquid crystal display circuit 4., this circuit provide the interface of CPU to the LCD liquid crystal display.The LCD module adopts STN 8X2 character mode lcd display.And directly drive by CPU GPIO mouth (S3C2440-GPIO-C).

Described centrometer key circuit 5, centrometer data storage circuitry 6, centrometer circuit of light sources 7, this key circuit have 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..

Described power circuit 8, program burn writing circuit 9, electrify restoration circuit 10, the power pack in this circuit 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 work: machine powers on, instrument enters holding state, in case shake-up trigger switch, promptly send work order, at this moment, the excusing from death ripple takes place and accepter calculates distance L between instrument and measured by the excusing from death wave reflection time of emission. and send DMP to, simultaneously, the CCD imaging system is gathered measured's facial information figure this moment, 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 range-measurement system works asynchronously with imaging system, so avoided owing to the measured does not fix the error that produces.

Instrument utilizes CCD imaging technique and ultrasonic ranging principle, by the DMP image processor, the measured's that CCD collected facial information is calculated, is analyzed, again according to the ultrasound wave range finding from, and then calculate measured's two interpupillary accurate distances.

Claims

1, contactless centrometer, it is characterized in that the first output/input of core cpu plate interface circuit and corresponding the joining of I/O end of ccd image Acquisition Circuit, second output/input of core cpu plate interface circuit and I/O end corresponding join of people's face to the range measurement circuit between the CCD photographic head, corresponding the joining of I/O end of the 3rd output/input of core cpu plate interface circuit and centrometer key circuit, corresponding the joining of I/O end of the 4th output/input of core cpu plate interface circuit and centrometer data storage circuitry, first outfan of core cpu plate interface circuit and the input of LCD liquid crystal display circuit join, second outfan of core cpu plate interface circuit and the input of centrometer circuit of light sources join, the first input end of core cpu plate interface circuit and the outfan of power circuit join, second input of core cpu plate interface circuit and the outfan of program burn writing circuit join, and the 3rd input of core cpu plate interface circuit and the outfan of electrify restoration circuit join.