CN102946507B - Method and system for reducing shooting background noises of camera - Google Patents

Abstract

A method for reducing shooting background noises of a camera is applied to a system with a main chip and the camera which are mutually connected. The method comprises the following steps: 1, setting a clock signal phase A at a main chip receiving end and a clock signal phase B at a camera transmitting end, wherein X is a permissible phase deviation maximum value; 2, performing phase matching operation on the clock signal phase A at the receiving end and the clock signal phase B at the camera transmitting end, if a matching difference result is smaller than X, entering a step 4, otherwise, entering a step 3; 3, equally dividing the signal phase B at the receiving end according to all-phase 360 degrees and setting as n, namely B1, B2, ..., Bn, performing matching operation on equally divided phase signals of the clock signal phase A at the receiving end and the clock signal phase B at the camera transmitting end till the matching difference is the minimum, and if the matching difference value is smaller than X, A is equal to By and y is equal to 1, 2, 3, ..., n; and 4, ending, and entering a normal shooting process. By the method and the system, the noises are reduced by adjusting the phase matching degree of clock signal input and clock signal output, thus improving the shooting effect of the camera.

Description

A kind of camera that reduces is taken pictures the method and system of background noise

Technical field

The present invention relates to a kind of terminal equipment shooting technology, particularly relate to a kind of camera that reduces and to take pictures the method and system of background noise.

Background technology

In prior art, it is mostly the raising about the technique of camera module own, and add corresponding filter circuit and solve the noise problem that camera takes pictures, the improvement of camera module technique and add the increase that corresponding filter circuit must cause cost, take corresponding PCB space, cause unnecessary cost increase and the restriction of layout.

At present, it is no matter the camera of cpu i/f or MIPI interface, cabling all will do corresponding impedance Control, to reach in signals transmission the deviation that there will not be in amplitude or phase place, and then avoid producing the displacement of corresponding signal, when causing camera to be taken pictures, background noise is bigger than normal, affects image quality.

Summary of the invention

The object of the invention is to overcome the deficiencies in the prior art, provide a kind of camera that reduces to take pictures the method and system of background noise, carry out reduction noise by the phase matched degree of adjustment clock signal constrained input, improve camera and to take pictures effect.

In order to achieve the above object, the technical solution used in the present invention is, a kind of camera that reduces is taken pictures the method for background noise, and described method is applied to the system comprising interconnective master chip, camera, comprises the following steps:

Step 1, arrange the clock signal phase A of master chip receiving terminal, camera transmitting terminal clock signal phase B, X are the maximum that phase deviation allows;

Step 2, to receiving terminal clock signal phase A, camera transmitting terminal clock signal phase B carries out the matching operation of phase place, if result coupling difference is less than X, then enters step 4; Otherwise enter step 3;

Step 3, according to all phase 360 degree, decile signal phase is carried out to receiving end signal phase place B, and is set to n, i.e. B1, B2 ..., Bn; Meanwhile, carry out matching operation to the decile phase signal of receiving terminal clock signal phase A and camera transmitting terminal clock signal phase B, until coupling difference is minimum, and coupling difference is less than X, then A=By, wherein y=1,2,3 ... n;

Step 4, end, enter and normally take pictures.

Further, described master chip shows serial line interface with camera by DSI(Display serial interface) or DBI interface communication be connected.

Further, described phase deviation X is default value, namely allows camera to produce the phase deviation of maximum background noise of taking pictures.

Further, the phase place A described in step 2 and the matching operation of phase place B comprise:

Step S201. calculates the deviation of phase place A and phase place B, and formula is Labs (A-B);

Labs (A-B) and X compare by step S202., and Labs (A-B) <X then phase deviation in allowed limits, otherwise enters step 3.

Further, matching operation described in step 3 is Labs (B-B1) <Labs (B-B2) < ... <Labs (B-By) <X, when coupling difference is less than X, then A=By, wherein y=1,2,3 ... n.

Described reduction camera is taken pictures the system of method of background noise, comprises master chip, camera, comprises further:

Clock module, arranges the clock signal phase A of master chip receiving terminal, and camera transmitting terminal clock signal phase B, X are the maximum that phase deviation allows;

First matching unit, for receiving terminal clock signal phase A, camera transmitting terminal clock signal phase B carries out the matching operation of phase place;

Deng subdivision, for carrying out decile signal phase to receiving end signal phase place B according to all phase 360 degree, and be set to n, i.e. B1, B2 ..., Bn;

Second matching unit, carries out matching operation to the decile phase signal of receiving terminal clock signal phase A and camera transmitting terminal clock signal phase B, until coupling difference is minimum, and coupling difference is less than X, then A=By, wherein y=1,2,3 ... n.

Compared with prior art, the invention has the beneficial effects as follows: by obtaining the clock signal phase A of master chip receiving terminal, camera transmitting terminal clock signal phase B, and the maximum that X is phase deviation permission is set; Obtain the deviation of phase place A and phase place B, and carry out reduction noise by the phase matched degree adjusting clock signal constrained input, improve camera and to take pictures effect.

Accompanying drawing explanation

fig. 1 is method flow diagram of the present invention;

Fig. 2 is system principle diagram of the present invention.

Embodiment

Be described in detail, to be interpretated more in-depth technical characteristic of the present invention and advantage with reference to accompanying drawing below in conjunction with embodiment.

As shown in Figure 1, 2, a kind of camera that reduces is taken pictures the method for background noise, and described method is applied to the system comprising interconnective master chip, camera, comprises the following steps:

Step 1, arrange the clock signal phase A of master chip receiving terminal, camera transmitting terminal clock signal phase B, X are the maximum that phase deviation allows;

Step 2, to receiving terminal clock signal phase A, camera transmitting terminal clock signal phase B carries out the matching operation of phase place, if result coupling difference is less than X, then enters step 4; Otherwise enter step 3;

Step 3, according to all phase 360 degree, decile signal phase is carried out to receiving end signal phase place B, and is set to n, i.e. B1, B2 ..., Bn; Meanwhile, carry out matching operation to the decile phase signal of receiving terminal clock signal phase A and camera transmitting terminal clock signal phase B, until coupling difference is minimum, and coupling difference is less than X, then A=By, wherein y=1,2,3 ... n, n be greater than zero integer;

Step 4, end, enter and normally take pictures.

Further, described master chip is connected by DSI or DBI interface communication with camera.

Further, described phase deviation X is default value, namely allows camera to produce the phase deviation of maximum background noise of taking pictures.When receiving terminal clock signal phase A and camera transmitting terminal clock signal phase B phase deviation too large time, the noise of formation is comparatively large, affects image quality.

Further, the phase place A described in step 2 and the matching operation of phase place B comprise:

Step S201. calculates the deviation of phase place A and phase place B, and formula is Labs (A-B);

Labs (A-B) and X compare by step S202., and Labs (A-B) <X then phase deviation in allowed limits, otherwise enters step 3.

Further, matching operation described in step 3 is Labs (A-B1) <Labs (A-B2) < ... <Labs (A-By) <X, when coupling difference is less than X, then A=By, wherein y=1,2,3 ... n.

Because master chip is to camera body, have certain path, this section of path has corresponding capacitance-resistance perception, i.e. corresponding combination parameter, cause, camera signals phase place on the transmission line advanced or delayed, but in actual conditions, the number of plies of pcb board is fewer, the crosstalk of signal is larger, and the integrality of signal is poorer, this advanced or delayed more serious, utilize software algorithm to enter horizontal phasing control, reach and reduce because the noise that causes of the skew of phase place.

The initial phase of such as B is 0, the actual signal phase received 45 degree of camera (actual because the factors such as PCB circuit material are unknowable) after phase place A is through circuit, then the phase place of this signal and phase place B are carried out match and regulate, be equivalent to a closed-loop control system, the deviation of moment adjustment signal, allows the deviation of A, B signal remain in certain scope and noise just can be avoided to affect effect of taking pictures).Suppose that A is 45 degree, but actual conditions receiving terminal software cannot be known, simultaneously, because the cycle of phase place is 360 degree, divide equally 360 degree according to certain ratio, be attached on the initial phase of B, mate, such as, B is divided into 8 parts, B1 is exactly 45 degree, B2 is 90 degree ... B8 is 360 degree, the initial phase of B is 0, and now the initial phase of B adds that 45 degree are just in time equal to the phase place of A, and now phase place reaches unanimously; For another example, A is 40 degree, that B1 be 45 degree closest, that allows A=B1 equally.Labs (A-B1) <Labs (A-B2) < ... <Labs (A-By) <X compares for taking absolute value, adopt Of Bubble Sort Algorithm, compare the size of A and By successively, when phase deviation is minimum, then remove A=By, when A=45 spends, B1 and A is closest, then get A=B1.

Described reduction camera is taken pictures the system of method of background noise, comprises master chip, camera, comprises further:

Clock module, arranges the clock signal phase A of master chip receiving terminal, and camera transmitting terminal clock signal phase B, X are the maximum that phase deviation allows;

First matching unit, for receiving terminal clock signal phase A, camera transmitting terminal clock signal phase B carries out the matching operation of phase place;

Deng subdivision, for carrying out decile signal phase to receiving end signal phase place B according to all phase 360 degree, and be set to n, i.e. B1, B2 ..., Bn;

Second matching unit, carries out matching operation to the decile phase signal of receiving terminal clock signal phase A and camera transmitting terminal clock signal phase B, until coupling difference is minimum, and coupling difference is less than X, then A=By, wherein y=1,2,3 ... n.

Above content is in conjunction with concrete optimal way further description made for the present invention, should not assert that specific embodiment of the invention is confined to above explanation.For those skilled in the art, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, within the protection range that the claim that all should be considered as being submitted to by the present invention is determined.

Claims (4)

1. reduce camera to take pictures the method for background noise, described method is applied to the system comprising interconnective master chip, camera, comprises the following steps:

Step 1, arrange the clock signal phase A of master chip receiving terminal, camera transmitting terminal clock signal phase B, X are the maximum that phase deviation allows;

Step 2, to receiving terminal clock signal phase A, camera transmitting terminal clock signal phase B carries out the matching operation of phase place, if result coupling difference is less than X, then enters step 4; Otherwise enter step 3;

Step 3, according to all phase 360 degree, decile signal phase is carried out to receiving end signal phase place B, and is set to n, i.e. B1, B2 ..., Bn; Meanwhile, carry out matching operation to the decile phase signal of receiving terminal clock signal phase A and camera transmitting terminal clock signal phase B, until coupling difference is minimum, and coupling difference is less than X, then A=By, wherein y=1,2,3 ... n;

Step 4, end, enter and normally take pictures;

Phase place A described in step 2 and the matching operation of phase place B comprise:

Step S201. calculates the deviation of phase place A and phase place B, and formula is Labs (A-B);

Labs (A-B) and X compare by step S202., and Labs (A-B) <X then phase deviation in allowed limits, otherwise enters step 3;

Matching operation described in step 3 is Labs (A-B1) <Labs (A-B2) < ... <Labs (A-By) <X, when coupling difference is less than X, then A=By, wherein y=1,2,3 ... n.

2. reduction camera according to claim 1 is taken pictures the method for background noise, it is characterized in that: described master chip is connected by DSI or DBI interface communication with camera.

3. reduction camera according to claim 2 is taken pictures the method for background noise, it is characterized in that: described phase deviation X is default value, namely allows camera to produce the phase deviation of maximum background noise of taking pictures.

4. the reduction camera according to any one of claim 1-3 is taken pictures the system of method of background noise, comprises master chip, camera, it is characterized in that, comprise further:

Clock module, arranges the clock signal phase A of master chip receiving terminal, and camera transmitting terminal clock signal phase B, X are the maximum that phase deviation allows;

First matching unit, for receiving terminal clock signal phase A, camera transmitting terminal clock signal phase B carries out the matching operation of phase place;

Deng subdivision, for carrying out decile signal phase to receiving end signal phase place B according to all phase 360 degree, and be set to n, i.e. B1, B2 ..., Bn;

Second matching unit, carries out matching operation to the decile phase signal of receiving terminal clock signal phase A and camera transmitting terminal clock signal phase B, until coupling difference is minimum, and coupling difference is less than X, then A=By, wherein y=1,2,3 ... n.