CN1547071A

CN1547071A - An exposure pulse generator, exposure generating device, and exposure pulse output method

Info

Publication number: CN1547071A
Application number: CNA2003101172416A
Authority: CN
Inventors: 董欣; 金传恩; 谢律
Original assignee: Vimicro Corp
Current assignee: Vimicro Corp
Priority date: 2003-12-09
Filing date: 2003-12-09
Publication date: 2004-11-17
Anticipated expiration: 2023-12-09
Also published as: CN100389363C

Abstract

The invention discloses a kind of exposure pulse generator referring to digital imaging field for exposure generating device. It includes a frequency divider, a frequency doubler, a delay counter, and an exposure pulse width counter. The character lies in: it also includes an erasable memory unit of exposure pulse character valve which can receive the outer writings; the exposure pulse character values contain characters values for adjusting one or more of the delay counter or the exposure pulse width counter. According to the project provided by the invention, the user can adjust the exposure parameter according to demands at any time, control the width of exposure pulse width, polarity and the delay time relative the exposure starting time, realizes a perfect exposure effect, acquires the best image quality. The invention also discloses an exposure generating device and an exposure light pulse output method based on above mentioned charging pulse generator.

Description

A kind of exposed pulse generator, exposure generating means, and the method for exposed pulse output

Technical field

The present invention relates to the digital vedio recording field, particularly a kind of exposed pulse generator of the generating means that is used for exposing, and based on the exposure generating means of this exposed pulse generator and the method for exposed pulse output.

Background technology

In the prior art, usually all to use the exposed pulse generator in the exposure system of digital camera, generally be when needs expose, produce charging pulse by the charging pulse generator earlier and give charging device, after finishing, charging can provide the signal that finishes that charges, main frame sends the exposure order again and gives the exposed pulse generator then, sends exposed pulse by the exposed pulse generator and exposes for the exposure generator.Existing exposed pulse generator generally is a general pulse producer, and it obtains needed exposed pulse with certain width with original reference clock by frequency division, frequency multiplier.

Accompanying drawing 1 is depicted as a kind of exposed pulse generator wherein, and it includes a frequency division, frequency multiplier, a delay counter and an exposed pulse width counter; Described frequency division, frequency multiplier is converted into the frequency doubling clock faster than original reference clock with original reference clock, or the frequency-dividing clock slower than original reference clock, according to the exposure principle, after obtaining the exposure order, can not expose immediately, need the specific time of delay just can send exposed pulse, realize by delay counter this specific time delay, after arriving this time delay that needs, send and begin the exposure order to exposed pulse width counter, begin exposure simultaneously, exposed pulse width counter begins counting, when the exposed pulse width counter meter start pulse signal that finishes during to the exposed pulse width value to expose is finished exposure.

But the shortcoming of exposed pulse generator is that the width of start time of exposed pulse and exposed pulse is uncontrollable in the above-mentioned prior art, and the polarity of exposed pulse also all can not change according to requirement of client at any time, so it is optimum that exposure can't reach, thereby cause the quality of image can not get the optimal image quality because these exposure parameters can't adjust.

Summary of the invention

In order to solve problems of the prior art and deficiency, the objective of the invention is to propose a kind of exposed pulse generator that has improved, it can adjust exposure parameter at any time according to user's needs, to reach perfect exposure effect, obtains the optimal image quality;

Another object of the present invention is to propose a kind of exposure generating means that can carry out programming Control to exposure process;

Another object of the present invention is to propose a kind of method of exposed pulse output.

In order to realize the foregoing invention purpose, the present invention proposes following technical scheme:

A kind of exposed pulse generator, comprise frequency division, a frequency multiplier that receives reference clock signal, a delay counter and an exposed pulse width counter that receives the exposure order, described frequency division, frequency multiplier are converted into the frequency doubling clock faster than original reference clock with original reference clock, or the frequency-dividing clock slower than original reference clock, as the internal reference clock; Delay counter postpones to handle to the exposure order that receives; The exposure trigger pulse is counted and sent to exposed pulse width counter according to the internal reference clock of frequency division, frequency multiplier generation and the exposure order that begins of delay counter generation; Its characteristics are, also comprise an erasable storage unit that receives the outside exposed pulse characteristic value that writes, this erasable storage unit includes one or more storeies, described storer is corresponding to arbitrary a plurality of or whole in described frequency division frequency multiplier or delay counter or the exposed pulse width counter, be used to store relevant exposed pulse characteristic value, frequency division frequency multiplier or delay counter or exposed pulse width counter carry out associative operation based on the exposed pulse characteristic value that erasable storage unit receives, and produce the exposure trigger pulse.

Described exposed pulse generator can further include a upset controller, includes the storer corresponding to this upset controller in the described erasable storage unit; The energizing signal that the upset controller sends according to the exposed pulse characteristic value in the described storer and above-mentioned exposed pulse width counter carries out the polarity upset operation.

Delay counter in the described exposed pulse generator includes an image frame head determining device, an one-level delay counter and a secondary delay counter; After the exposure order of delay counter reception from the outside, obtain the frame head of next frame by image frame head determining device, at this moment the image parameter that transmits according to the outside starts the one-level delay counter, according to the exposed pulse length of delay that receives in the storer corresponding to delay counter in the erasable storage unit, one-level delay counter begin column counting number, remember to start the secondary delay counter behind the certain value, can provide the order of beginning exposed pulse to exposed pulse width counter according to the value of target exposure length of delay and secondary delay counter.

Described exposed pulse characteristic value includes but not limited to exposed pulse length of delay, exposed pulse width value, frequency division parameter and exposed pulse polarity number.

A kind of exposure generating means comprises a CPU, a charging pulse generator and an exposure generator, and its characteristics are, also comprise an above-mentioned exposed pulse generator; CPU sends charging instruction to the charging pulse generator, the charging pulse generator sends charging pulse to the exposure generator, CPU charging finishing signal is given in exposure generator charging finishing back, CPU sends exposure instruction and various exposed pulse characteristic value to the exposed pulse generator then, the exposed pulse generator adjust according to these characteristic values have certain delay, the exposure trigger pulse of certain polarity and certain width gives the exposure generator, the exposure generator carries out exposing operation.

A kind of method of exposed pulse output comprises:

Main frame generates an exposed pulse characteristic value according to user's requirement;

Give the exposed pulse generator with these characteristic values then;

The exposed pulse generator has the exposure start pulse signal of certain delay, certain polarity and certain width according to these exposed pulse characteristic values generations.

The contrast prior art the invention has the advantages that:

According to scheme provided by the present invention, the user can adjust exposure parameter on demand at any time, to the width of exposed pulse, polarity with respect to controlling the time delay of the order that begins to expose, reaches perfect exposure effect, obtains the optimal image quality.

But advantage of the present invention is not limited to the above-mentioned application of lifting, below in conjunction with accompanying drawing be not that certain embodiments comes the utility model is done more detailed explanation.

Description of drawings

Fig. 1 is a kind of exposed pulse generator in the prior art;

Fig. 2 is the structural representation of exposed pulse generator of the present invention;

Fig. 3 is the synoptic diagram of embodiment one of the present invention;

Fig. 4 is the synoptic diagram of embodiment two of the present invention;

Fig. 5 is the embodiment synoptic diagram of exposure generating means of the present invention;

Embodiment

In the following description, known function or structure will no longer describe in detail, to avoid there be unnecessary obscuring with content of the present invention.

As shown in Figure 2, structural drawing for exposed pulse generator of the present invention, comprise a frequency division, frequency multiplier 30, a delay counter 20, an exposed pulse width counter 40 and an erasable storage unit 10, described erasable storage unit 10 receives the outside exposed pulse characteristic value that imports into, include one or more storer (not shown) in the erasable storage unit 10, described storer is corresponding to arbitrary a plurality of or whole in described frequency division frequency multiplier or delay counter or the exposed pulse width counter, be used to store relevant exposed pulse characteristic value, based on above-mentioned characteristic value, frequency division, frequency multiplier 30 is converted into the frequency doubling clock faster than original reference clock with original reference clock, or the frequency-dividing clock slower than original reference clock, as the internal reference clock; The exposure order that 20 pairs of delay counters receive postpones to handle; The exposure trigger pulse is counted and sent to exposed pulse width counter 40 according to the internal reference clock of frequency division, frequency multiplier 30 generations and the exposure order that begins of delay counter 20 generations.

Embodiment one

As shown in Figure 3, synoptic diagram for exposed pulse generator embodiment one of the present invention, comprise a frequency division, 30, one delay counters of frequency multiplier 20, exposed pulse width counter 40, an erasable storage unit 10 and a upset controller 50;

Wherein, erasable storage unit 10 in the exposed pulse generator includes storer 11, storer 12, storer 13 and storer 14, and it receives exposed pulse length of delay, exposed pulse width value, frequency division parameter and exposed pulse polarity number that main frame or other host provide respectively;

The frequency division parameter that frequency division, frequency multiplier 30 receives reference clock signals and receive according to storer 13 obtains the reference clock of internal request;

The exposed pulse length of delay that delay counter 20 receives according to storer 11 postpones to handle to the exposure order that main frame or other host send, arrive the time delay of these needs after, sending and begin the exposure order to exposed pulse width counter 40;

The internal reference clock that exposed pulse width counter 40 produces according to frequency division, frequency multiplier 30, delay counter 20 produce, and the exposed pulse width value that order and storer 12 receive that begins to expose begins counting, gives upset controller 50 when exposed pulse width counter 40 sends energizing signal during to the exposed pulse width value;

The energizing signal that exposed pulse polarity number that upset controller 50 provides according to storer 14 and exposed pulse width counter 40 send produces the exposed pulse signal.

Embodiment two

As shown in Figure 4, synoptic diagram for exposed pulse generator embodiment two of the present invention, comprise a frequency division, 30, one delay counters of frequency multiplier 20, exposed pulse width counter 40, an erasable storage unit 10 and a upset controller 50; Erasable storage unit 10 in the exposed pulse generator includes storer 11, storer 12, storer 13 and storer 14, and it receives exposed pulse length of delay, exposed pulse width value, frequency division parameter and exposed pulse polarity number that main frame or other host provide respectively;

Wherein: include storer 110 and storer 111 two parts in the storer 11, it receives different exposed pulse length of delays respectively; Include an image frame head determining device 21, an one-level delay counter 22 and a secondary delay counter 23 in the delay counter 20;

After the exposure order that delay counter 20 receives from the outside, obtain the frame head of next frame by image frame head determining device 21, at this moment the image parameter that transmits according to the outside starts one-level delay counter 22, according to the exposed pulse length of delay that receives in the storer 110, one-level delay counter 22 begin column counting numbers, after remembering certain value, start secondary delay counter 23, secondary delay counter 23 is counted according to the exposed pulse length of delay in storer 110 and the storer 111, value delay counter 20 according to target exposure length of delay and secondary delay counter 23 can provide the upset of beginning exposed pulse order control triggering exposed pulse, starts exposed pulse width counter 40 simultaneously;

The exposed pulse width value that exposed pulse width counter 40 receives according to storer 12 begins counting, gives upset controller 50 when exposed pulse width counter 40 sends energizing signal during to the exposed pulse width value;

Embodiment three

Be the specific embodiment of exposure generating means of the present invention as shown in Figure 5, comprise a CPU100, a charging pulse generator 200 and an exposure generator 300, also comprise an embodiment of the invention three described exposed pulse generators 400.

CPU100 is used for sending control command, promptly sends charging instruction to charging pulse generator 200; The requirement of the frequency to charging pulse that charging pulse generator 200 provides according to CPU100, polarity, dutycycle produces the charging pulse of needs, and exposure generator 300 is charged; 300 chargings of CPU100 indication exposure generator can be sent the charging signal that finishes and giving CPU100 after exposure generator 300 charges electricity, CPU100 obtains charging and finishes that control exposed pulse generator 400 sends exposed pulse behind the signal; Exposure trigger generator 400 produces the exposed pulse that needs, and indication exposure generator 300 is finished exposure.

CPU100 sends charging instruction to charging pulse generator 200, charging pulse generator 200 sends charging pulse and charges to exposure generator 300, CPU100 charging finishing signal is given in exposure generator 300 chargings finishing back, CPU100 sends exposure instruction and various exposed pulse characteristic value to exposed pulse generator 400 then, exposed pulse generator 400 adjusts the exposure trigger pulse with certain polarity, width according to these characteristic values and gives exposure generator 300, and exposure generator 300 carries out exposing operation.

In sum, exposed pulse generator of the present invention, and based on the exposure generating means of this exposed pulse generator and the method for exposed pulse output, be not limited to listed utilization in instructions and the embodiment, it can be applied to various suitable the present invention's field fully, for those skilled in the art, can easily realize additional advantage and make amendment, therefore under the situation of the spirit and scope of the universal that does not deviate from claim and equivalency range and limited, the present invention is not limited to specific details, representational equipment and the examples shown that illustrates here and describe.

Claims

1. An exposure pulse generator, comprising a frequency divider and a frequency multiplier for receiving a reference clock signal, a delay counter for receiving an exposure command and an exposure pulse width counter, the frequency divider and the frequency multiplier convert the original reference The clock is converted into a multiplied clock faster than the original reference clock, or a frequency-divided clock slower than the original reference clock, as the internal reference clock; the delay counter delays the received exposure command; the exposure pulse width counter is based on the frequency division 1. The internal reference clock generated by the frequency multiplier and the start exposure command generated by the delay counter count and issue an exposure trigger pulse; it is characterized in that it also includes a rewritable storage unit that receives an externally written exposure pulse characteristic value, and the The characteristic value of the exposure pulse may include a characteristic value for adjusting any one or more of the frequency division multiplier or the delay counter or the exposure pulse width counter, the frequency division multiplier or the delay counter or the exposure pulse The width counter performs correlation operations based on the characteristic values of the exposure pulses received by the rewritable memory unit to generate an exposure trigger pulse.

2. The exposure pulse generator according to claim 1, further comprising an inversion controller, the rewritable storage unit includes a memory corresponding to the inversion controller; the inversion controller according to the The polarity inversion operation is performed on the characteristic value of the exposure pulse in the memory and the inversion signal sent by the above-mentioned exposure pulse width counter.

3. The exposure pulse generator according to claim 2, wherein the delay counter in the exposure pulse generator includes an image frame header judger, a primary delay counter and a secondary delay counter; delay After the counter receives the exposure command from the outside, the frame header of the next frame is obtained through the image frame header judger. The exposure pulse delay value received in the memory, the first-level delay counter starts counting the number of lines, and starts the second-level delay counter after a certain value is recorded, and can be given to the exposure pulse width counter according to the target exposure delay value and the value of the second-level delay counter Start exposure pulse command.

4. The exposure pulse generator according to claim 1, wherein the exposure pulse characteristic values include but not limited to exposure pulse delay value, exposure pulse width value, frequency division parameter and exposure pulse polarity value.

5. The exposure pulse generator according to claim 1, characterized in that, the delay counter in the exposure pulse generator includes an image frame header judger, a primary delay counter and a secondary delay counter; delay After the counter receives the exposure command from the outside, the frame header of the next frame is obtained through the image frame header judger. The exposure pulse delay value received in the memory, the first-level delay counter starts counting the number of lines, and starts the second-level delay counter after a certain value is recorded, and can be given to the exposure pulse width counter according to the target exposure delay value and the value of the second-level delay counter Start exposure pulse command.

6. An exposure generating device, comprising a CPU, a charging pulse generator and an exposure generator, characterized in that it also includes an exposure pulse generator according to any one of claims 1 to 5; the CPU sends a charging instruction To the charging pulse generator, the charging pulse generator sends charging pulses to the exposure generator, after the exposure generator is fully charged, it sends a charging complete signal to the CPU, and then the CPU sends exposure instructions and various exposure pulse characteristic values to the exposure pulse generator, and the exposure The pulse generator adjusts the exposure trigger pulse with a certain polarity and width to the exposure generator according to these characteristic values, and the exposure generator performs the exposure operation.

7. A method for charging pulse output, comprising:

The host generates an exposure pulse characteristic value according to the user's requirements;

These characteristic values are then sent to the exposure pulse generator;

The exposure pulse generator generates an exposure trigger pulse signal with a certain polarity and width according to these exposure pulse characteristic values.