CN101841647B - Circuit and method for processing image abnormity caused by power supply - Google Patents
Circuit and method for processing image abnormity caused by power supply Download PDFInfo
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- CN101841647B CN101841647B CN2009101280329A CN200910128032A CN101841647B CN 101841647 B CN101841647 B CN 101841647B CN 2009101280329 A CN2009101280329 A CN 2009101280329A CN 200910128032 A CN200910128032 A CN 200910128032A CN 101841647 B CN101841647 B CN 101841647B
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Abstract
The invention relates to a method for processing image abnormity caused by a power supply, which is applied to a digital photographic device. The method comprises the following steps of starting the power supply of the digital photographic device; then beginning to transmit a line data of a shot image, wherein the line data comprises a virtual pixel region and an effective pixel region; transmitting the virtual pixel region and then continuing to transmit various pixel data of the effective pixel region; generating a pulse width modulation signal by means of the digital photographic device; controlling a simulation element to be in an opened state by the pulse width modulation signal within a predetermined time before a voltage and current regulating unit supplies voltage and current to a analog front-end processing unit; otherwise, controlling the simulation element to be in a closed state; ensuring a horizontal drive current to substantially tend to be in a stable state before the effective pixel region begins to be output; and repeating the above steps, continuing to transmit the other line data of the shot image until the image of the digital photographic device is completely transmitted and then stopping.
Description
Technical field
The invention relates to a kind of image capture technology, particularly about handling the technology of image abnormity caused by power supply.
Background technology
(progress of Digital Signal Processing is also pursued the performance of high sensitivity (ISO) simultaneously except chasing high-resolution on the market for Digital Still Camera, the DSC) evolution of technology along with digital camera.Yet technical problem is also following, and high-resolution needs more sensor pixels, so the bigger electric current of essential utilization comes out data (image) transmission.Yet need high sensitivity and do not increase under the condition of sensor pixel, it certainly will strengthen analog-gain value again.Under so harsh environment, the speed of the instant response of power-supply system (transient response) also can influence the quality of image to some extent.
Fig. 1 illustrates the calcspar of general common digital camera system.Consult Fig. 1; Digital camera 90 comprises digital signal processor (digital signal processor; DSP) 100, AFE(analog front end) (analog front end; AFE) (charge coupled device, CCD) 98, low-dropout regulator (Low Drop-Out Voltage regulator LDO) 94, power supply 92, wherein low-dropout regulator 94 also can be that DC is to DC (DC/DC) transducer for unit 96, charge coupled cell.The function of LDO 94 or DC/DC 94 is that power supply is given each circuit unit.Digital signal processor 100 has been controlled the running of whole system, comprises the control with CCD 98 to AFE 96.AFE 96 also can send level and vertical control signal (Φ to CCD in the time of the horizontal-drive signal Hsync (Horizontal sync pulse) that reception DSP 100 sends
HWith Φ
V), the same time also receive CCD 98 the output signal (Output Signal, OS).ADC/AGC 116 and ADC 110, the view data of output signal is transmitted back to DSP 100 again from become digital signal by analog-converted after, and this is the image processing flow process of digital camera.DSP 100 also can controls lens driver 124, with indirect controls lens module 126.
Other member for example memory element RAM 104, ROM 106 and LCD panel (LCD panel) 102 in order to display image.Comprise more again among the AFE 96 that (timing generator, TG) 108 generation horizontal frequencies and vertical frequency are given horizontal driver 112 and vertical driver 114 respectively to time controller again.Low-dropout regulator 94 comprises provides horizontal voltage V
Ф HWith horizontal current I
Ф HGive horizontal driver 112, with the image of the horizontal scanning line of driven image.Image at 98 sensings of CCD is the then output of a line of a line.
Because horizontal current I
Ф HHave in the starting stage and to pour in the noise that (inrush) moment vibrates, cause the quality in leading portion zone of output image influenced, it is vertical bar line, horizontal stripe, ghost, pit etc. for example, all can have a strong impact on the quality of image.
Fig. 2 illustrates the time relationship sketch map that traditional images transmits.Fig. 3 illustrates in the traditional images transport process of Fig. 2 the enlarged diagram in preliminary sectors 140.Consult Fig. 2 earlier, it is horizontal-drive signal Hsync, horizontal control signal Φ
H, horizontal voltage V
Ф HWith horizontal current I
Ф HTime relationship Deng signal.Horizontal control signal Φ
HBe horizontal shift frequency (Horizontal shift clock).Because AFE 96 is sending horizontal control signal Φ to CCD 98
HIn the time of signal, can produce the instantaneous large-current of about 100mA.The horizontal control signal Φ of the transmission that this instantaneous large-current causes
HHorizontal driver 112 because of the electric current voltage instability, and then the image that causes CCD 98 is related being interfered of analog signal of left initiation region and noises such as vertical bar line occur.The phenomenon of electric current and spread of voltage, shown in preliminary sectors 140, its enlarged diagram is as shown in Figure 3.
Consult Fig. 3, with Φ
HThe preliminary sectors 140 that has just begun to see off is amplified; Then can know and see when electric current is unstable; The void that preliminary sectors 140 surpasses a horizontal image is put pixel (dummy pixel) zone 142, and some pixel regions 146 that belong to valid pixel (effective Pixel) zone 144 have begun to have transmitted.This that is to say because of at the beginning electric current shakiness causes the bad pixel (bad pixel) in zone 146 can influence ccd image at left (section start), and the picture quality of corresponding region 146 is the main causes that cause noise.
The problem of above-mentioned at least picture noise is to be necessary to be solved.
Summary of the invention
The present invention provides a kind of method and circuit of handling image abnormity caused by power supply, to reduce the problem of image front-end noise at least.
The present invention provides a kind of method of handling image abnormity caused by power supply, is used in the digital photographic device, comprises the power supply that starts this digital photographic device.Follow, begin to transmit line data of the image that is absorbed, wherein these line data have void to put pixel region and effective pixel area.Transmit this void earlier and put a plurality of pixel datas that the pixel region continued transmits this effective pixel area.This digital photographic device produces pulse-width signal; In the scheduled time before the electric current and voltage regulon provides voltage and electric current to the AFE(analog front end) processing unit; Emulation element is controlled by this pulse-width signal becomes opening; Otherwise be closed condition; A period of time is produced the state so that this horizontal drive electric current before beginning to export this effective pixel region, has tended towards stability in fact more ahead of time to impel the horizontal drive current ratio that will input to horizontal driver to begin to transmit the time point of these line data of this image that is absorbed.Repeat above-mentioned steps, continue to transmit another line data of this image that is absorbed, after transmitting fully, stop up to this image at this digital photographic device.
The present invention provides a kind of circuit of handling image abnormity caused by power supply, is used in the digital photographic device.This circuit comprises digital signal processor, AFE(analog front end) processing unit, image capture unit, electric current and voltage regulon, power supply circuit and emulation element (emulative device).The AFE(analog front end) processing unit contains horizontal driver, and with digital signal processor two-way communication, wherein digital signal processor or AFE(analog front end) processing unit output pulse width modulation signal.The driving of this horizontal driver is accepted in image capture unit and digital signal processor two-way communication.The electric current and voltage regulon provides a voltage and an electric current to the AFE(analog front end) processing unit at least.Power supply circuit provides power supply to the electric current and voltage regulon.Emulation element is connected with this electric current and voltage regulon one output.In the scheduled time before the electric current and voltage regulon provides voltage and electric current to the AFE(analog front end) processing unit, emulation element is controlled by this pulse-width signal becomes opening, otherwise is closed condition.
For letting the above-mentioned feature and advantage of the present invention can be more obviously understandable, hereinafter is special lifts embodiment, and cooperates appended graphic elaborating as follows.
Description of drawings
Fig. 1 is the calcspar of digital camera system.
Fig. 2 illustrates the time relationship sketch map that traditional images transmits.
Fig. 3 illustrates in the traditional images transport process of Fig. 2 the enlarged diagram in preliminary sectors 140.
Fig. 4 illustrates according to one embodiment of the invention, processing horizontal transposition frequency Φ
HSchematic diagram of mechanism.
Fig. 5 illustrates the enlarged diagram in a zone among Fig. 4.
Fig. 6 illustrates according to one embodiment of the invention, according to the mechanism of Fig. 4, and a kind of circuit box sketch map of handling image abnormity caused by power supply.
Fig. 7 is according to one embodiment of the invention, a kind of method sketch map of handling image abnormity caused by power supply.
[main element label declaration]
90: digital camera 92: power supply
94: low-dropout regulator 96: analog front-end unit
98: charge coupled cell 100: digital signal processor
102:LCD panel 104:RAM
106:ROM 108: time controller
110:ADC 112: horizontal driver
114: vertical driver 116:ADC/AGC
124: lens driver 126: camera lens module
140: preliminary sectors 142: void is put pixel region
144: effective pixel area 146: zone
150: void is put pixel region 160: effective pixel area
200:DSP 202: simulator
204: power supply 206:LDO
208:AFE 210: horizontal driver
212:PWM signal 214:CCD
S700～S708: step
Embodiment
The present invention proposes to handle the method and the circuit of image abnormity caused by power supply at least, and cooperates a plurality of embodiment that the present invention is described.Yet, the invention is not restricted to a plurality of embodiment that lifted.
The present invention adopts processing horizontal transposition frequency Φ
HStarting mode, it for example can be through being provided with simulator (Emulative Device); Use has the LDO or the DC/DC of instant response faster; Or use inductance and electric capacity (LC) to revise the instant response curve of LDO or DC/DC.
Fig. 4 illustrates according to one embodiment of the invention, processing horizontal transposition frequency Φ
HSchematic diagram of mechanism.Fig. 5 illustrates the enlarged diagram in a zone among Fig. 4.Fig. 6 illustrates according to one embodiment of the invention, according to the mechanism of Fig. 4, and a kind of circuit box sketch map of handling image abnormity caused by power supply.Cooperate and consult Fig. 4～6, present embodiment is provided with simulator 202 in employing.The drive circuit in adopting the digital camera system of CCD 214 for example, the DSP 100 of DSP 200 functions such as Fig. 1 is similar, is used for controlling image-pickup device.Horizontal driver 210 in AFE 208 is to its horizontal shift frequency Φ
HStarting mode, for example increase a simulator 202 and be used as load device.This simulator 202 can adopt simple circuit to realize; For example reach by switch and resistor; Wherein switch for example can be reached by semiconductor transistor, and it more for example is bipolar junctions faceted crystal pipe (BJT) or metal oxide semiconductor transistor (MOS).Transistor can be opened or closed by control signal, is used as switch and uses, and also is easy to control.Present embodiment is to be example with BJT, and it accepts pulse-width modulation (PWM) signal controlling, to open or to close.Pwm signal for example can be produced by DSP 200.Yet AFE 208 also can produce pwm signal 212.In other words, DSP 200 or AFE 208 can produce pwm signal, or also can be produced the pwm signal of equity by other unit.One end of simulator 202 and the input of AFE 208 couple, and other end ground connection.The input of AFE 208 receives the horizontal voltage V of LDO 206
Ф HWith horizontal current I
Ф HPower supply 204 provides system voltage to LDO 206.The input of AFE 208 also can be to be provided by the DC/DC transducer.
From Fig. 4, when horizontal-drive signal Hsync starts, horizontal shift frequency Φ
HCan not produce at once.Owing to be provided with simulator 202, start simulator 202 through pwm signal in the A period, can let Φ
HBefore beginning to see off, I
Φ HWith V
Φ HJust arrive stable state, so can reduce the LDO big electric current twitch of moment.In the B period, simulator 202 cuts out.So horizontal shift frequency Φ
HBegin to transmit the view data of a line.Thin portion amplification in the A period can be consulted Fig. 5.
Can find out in Fig. 5; Also be not sent to effective pixel area (effective pixel region) before 160 at the output signal OS of CCD 214; The electric current that just load resistance is arranged and produced; Make the noise of inrush current to take place ahead of time, and then effectively reduce the noise of ccd image left (section start).In this, because the front of effective pixel area 160 still has void to put pixel region 150, so the width of PWM can proper fit.
Present embodiment utilizes simulator 202, can effectively eliminate the noise of ccd image left.Φ
HDummy load device on the signal can solve and generally to improve power-supply system.This simulator can be along with the error on the element characteristic, and on the effect of reducing noise difference to some extent.Sensor at various combination follows in the power-supply system, only need pass through the size of Simple Calculation and slightly correction dummy load and can effectively revise.
Fig. 7 illustrates according to one embodiment of the invention, a kind of method sketch map of handling image abnormity caused by power supply.Consult Fig. 7 and cooperate and consult Fig. 6, in step S700, electric power starting, system just is unlocked.In step S702, begin to transmit line data of ccd image.In S704, the mechanism of dummy load is unlocked earlier, that is to say that simulator (device) 202 is activated.In step S706, simulator 202 is kept opening and is begun to transmit Φ up to horizontal driver 210
HBefore, simulator 202 can be closed, and is transmitted up to line data of the image of CCD.In step S708, continue the output of next bar line, and keep this circulation and exported fully up to image.
In other words, the present invention handles the horizontal drive electric current that will input to horizontal driver, makes this horizontal drive electric current before beginning to export this effective pixel region, and state has tended towards stability in fact.On general method, itself and Fig. 7's is machine-processed similar, all is that the processing horizontal drive current makes and begins to export before this effective pixel region, and state has tended towards stability in fact.Because electric current and voltage have certain relation therebetween, the processing horizontal electric current is also to equaling the mode of processing horizontal voltage again.Current stabilization representes that also voltage is stable.Similarly, the stable current stabilization of also representing of voltage.
Though the present invention discloses as above with embodiment; Right its is not in order to limit the present invention; Has common knowledge the knowledgeable in the technical field under any; Do not breaking away from the spirit and scope of the present invention, when doing a little change and retouching, so protection scope of the present invention is as the criterion when looking appended the claim scope person of defining.
Claims (7)
1. a method of handling image abnormity caused by power supply is used in the digital photographic device, comprising:
Start the power supply of this digital photographic device;
Begin to transmit line data of the image that is absorbed, wherein these line data have void to put pixel region and effective pixel area, transmit this void earlier and put a plurality of pixel datas that the pixel region continued transmits this effective pixel area;
This digital photographic device produces pulse-width signal;
Begin to transmit in the scheduled time before a horizontal shift frequency is given this digital photographic device being close to the AFE(analog front end) processing unit; Emulation element is controlled by this pulse-width signal becomes opening; Otherwise be closed condition; A period of time is produced more ahead of time to impel the horizontal drive current ratio that will input to horizontal driver to begin to transmit the time point of these line data of this image that is absorbed; The state so that this horizontal drive electric current before beginning to export this effective pixel region, has tended towards stability in fact, this emulation element is set closed condition when outer at the fixed time; And
Repeat above-mentioned steps, continue to transmit another line data of this image that is absorbed, after transmitting fully, stop up to this image at this digital photographic device.
2. a circuit of handling image abnormity caused by power supply is used in the digital photographic device, comprising:
Digital signal processor;
The AFE(analog front end) processing unit contains horizontal driver, and with this digital signal processor two-way communication, wherein this digital signal processor or this AFE(analog front end) processing unit output pulse width modulation signal;
The driving of this horizontal driver with this digital signal processor two-way communication, is also accepted in the image capture unit;
The electric current and voltage regulon provides a voltage and an electric current to this AFE(analog front end) processing unit at least;
Power supply circuit provides power supply to this electric current and voltage regulon; And
Emulation element is connected with this electric current and voltage regulon one output,
Wherein begin to transmit in the scheduled time before a horizontal shift frequency is given this digital photographic device being close to this AFE(analog front end) processing unit, this emulation element is controlled by this pulse-width signal becomes opening, otherwise is closed condition at the fixed time.
3. the circuit of processing image abnormity caused by power supply according to claim 2, wherein this emulation element comprises:
Load;
Thyristor connects into series circuit with this load, and this series circuit has first end to be connected with the input of this horizontal driver, and the second end ground connection, and this thyristor is by this pulse-width signal control.
4. the circuit of processing image abnormity caused by power supply according to claim 3, wherein this load is a resistor,
5. the circuit of processing image abnormity caused by power supply according to claim 2, wherein the electric current and voltage regulon comprises that low-dropout regulator or DC are to the DC transducer.
6. the circuit of processing image abnormity caused by power supply according to claim 2, wherein this horizontal driver of this AFE(analog front end) processing unit provides horizontal frequency to this image capture unit, impels this image capture unit to transmit the view data of being absorbed.
7. the circuit of processing image abnormity caused by power supply according to claim 6 is wherein worked as this emulation element and is activated, and makes this electric current of this electric current and voltage regulon output flow into this emulation element earlier, and this emulation element bears the inrush current noise of this electric current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101280329A CN101841647B (en) | 2009-03-17 | 2009-03-17 | Circuit and method for processing image abnormity caused by power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101280329A CN101841647B (en) | 2009-03-17 | 2009-03-17 | Circuit and method for processing image abnormity caused by power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101841647A CN101841647A (en) | 2010-09-22 |
| CN101841647B true CN101841647B (en) | 2012-11-14 |
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| CN2009101280329A Expired - Fee Related CN101841647B (en) | 2009-03-17 | 2009-03-17 | Circuit and method for processing image abnormity caused by power supply |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5694030A (en) * | 1993-03-15 | 1997-12-02 | Kabushiki Kaisha Toshiba | Magnetic element for power supply and DC-to-DC converter |
| US7215371B2 (en) * | 1997-02-20 | 2007-05-08 | Eastman Kodak Company | Electronic camera with quick review of last captured image |
-
2009
- 2009-03-17 CN CN2009101280329A patent/CN101841647B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5694030A (en) * | 1993-03-15 | 1997-12-02 | Kabushiki Kaisha Toshiba | Magnetic element for power supply and DC-to-DC converter |
| US7215371B2 (en) * | 1997-02-20 | 2007-05-08 | Eastman Kodak Company | Electronic camera with quick review of last captured image |
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| Publication number | Publication date |
|---|---|
| CN101841647A (en) | 2010-09-22 |
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Granted publication date: 20121114 Termination date: 20160317 |