CN111083384A - Exposure adjusting method and device, electronic equipment and storage medium thereof - Google Patents
Exposure adjusting method and device, electronic equipment and storage medium thereof Download PDFInfo
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- CN111083384A CN111083384A CN201911243883.8A CN201911243883A CN111083384A CN 111083384 A CN111083384 A CN 111083384A CN 201911243883 A CN201911243883 A CN 201911243883A CN 111083384 A CN111083384 A CN 111083384A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/71—Circuitry for evaluating the brightness variation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/73—Circuitry for compensating brightness variation in the scene by influencing the exposure time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/745—Detection of flicker frequency or suppression of flicker wherein the flicker is caused by illumination, e.g. due to fluorescent tube illumination or pulsed LED illumination
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Abstract
The embodiment of the invention discloses an exposure adjusting method, an exposure adjusting device, electronic equipment and a storage medium, wherein the method comprises the following steps: acquiring at least two light source frequencies in the current environment and frequency intensity corresponding to each light source frequency in the at least two light source frequencies through a color temperature sensor; selecting a target light source frequency from the at least two light source frequencies according to the frequency intensity corresponding to each light source frequency in the at least two light source frequencies; and acquiring target exposure parameters corresponding to the target light source frequency, and carrying out exposure processing according to the target exposure parameters.
Description
Technical Field
The present invention relates to image processing technologies, and in particular, to an exposure adjustment method and apparatus, an electronic device, and a storage medium thereof.
Background
At present, electronic devices such as mobile phones, tablet phones and digital cameras have become daily necessities of people, and users often need to use the electronic devices to take pictures, record videos and the like in life and work. And during shooting, the flicker of the image needs to be eliminated by an automatic exposure device. The existing exposure regulation scheme is relatively fixed, only 50HZ alternating current (domestic) or 60HZ alternating current (foreign) is subjected to anti-flicker suppression, and the scheme is also independently configured according to specific environments. However, in an actual shooting scene, light sources with different frequencies exist. Such as: light Emitting Diode (LED) lamps, xenon lamps, etc. used in urban street lamps generally have operating frequencies of 100HZ to 200 HZ. For another example: the working frequency of the LED electronic screen used indoors is different from 30HZ to 75 HZ. Therefore, the conventional automatic exposure apparatus cannot perform accurate exposure in a scene where light sources of a plurality of frequencies are present.
Disclosure of Invention
The embodiment of the invention provides an exposure adjusting method and device, electronic equipment and a storage medium thereof, which can implement accurate exposure under the scene of light sources with multiple frequencies.
The technical scheme of the embodiment of the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides an exposure adjustment method, where the method includes:
acquiring at least two light source frequencies in the current environment and frequency intensity corresponding to each light source frequency in the at least two light source frequencies through a color temperature sensor;
selecting a target light source frequency from the at least two light source frequencies according to the frequency intensity corresponding to each light source frequency in the at least two light source frequencies;
and acquiring target exposure parameters corresponding to the target light source frequency, and carrying out exposure processing according to the target exposure parameters.
In a second aspect, an embodiment of the present invention provides an exposure adjustment apparatus, including:
the acquisition unit is used for acquiring at least two light source frequencies in the current environment and the frequency intensity corresponding to each light source frequency in the at least two light source frequencies through the color temperature sensor;
a selecting unit, configured to select a target light source frequency from the at least two light source frequencies according to a frequency intensity corresponding to each of the at least two light source frequencies;
and the convergence unit is used for acquiring a target exposure parameter corresponding to the target light source frequency and carrying out exposure processing according to the target exposure parameter.
In a third aspect, an embodiment of the present invention provides an electronic device, including a processor and a memory configured to store a computer program capable of running on the processor, wherein the processor is configured to execute the steps of the exposure adjustment method when running the computer program.
In a fourth aspect, an embodiment of the present invention provides a storage medium storing an executable program, where the executable program, when executed by a processor, implements the exposure adjustment method executed by the electronic device.
The exposure adjusting method provided by the embodiment of the invention comprises the following steps: acquiring at least two light source frequencies in the current environment and frequency intensity corresponding to each light source frequency in the at least two light source frequencies through a color temperature sensor; selecting a target light source frequency from the at least two light source frequencies according to the frequency intensity corresponding to each light source frequency in the at least two light source frequencies; and acquiring target exposure parameters corresponding to the target light source frequency, and performing exposure processing through the target exposure parameters, so that a plurality of light source frequencies in a real environment are acquired through a color temperature sensor, the target light source frequency under an exposure condition is selected from the plurality of light source frequencies according to the frequency intensity of each light source, and exposure processing of flicker elimination is performed based on the target light source frequency, so that the method is suitable for a complex light source scene with a plurality of frequencies of a plurality of light sources or one light source, and accurate exposure is performed under the scene with the light sources with the plurality of frequencies.
Drawings
FIG. 1 is a schematic flow chart of an alternative exposure adjustment method provided by an embodiment of the invention;
FIG. 2 is a schematic flow chart of an alternative exposure adjustment method provided by the embodiment of the invention;
FIG. 3 is a schematic diagram of an alternative frequency domain plot for providing a sampled signal according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of an alternative exposure adjustment method provided by the embodiment of the invention;
FIG. 5 is a schematic flow chart of an alternative exposure adjustment method provided by the embodiment of the invention;
FIG. 6 is a schematic flow chart of an alternative exposure adjustment method provided by the embodiment of the invention;
FIG. 7 is a schematic flow chart of an alternative exposure adjustment method provided by the embodiment of the invention;
fig. 8 is an alternative structural schematic diagram of an electronic device according to an embodiment of the present invention;
fig. 9 is an alternative structural schematic diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings, the described embodiments should not be construed as limiting the present invention, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
In various embodiments of the invention: acquiring at least two light source frequencies in the current environment and frequency intensity corresponding to each light source frequency in the at least two light source frequencies through a color temperature sensor; selecting a target light source frequency from the at least two light source frequencies according to the frequency intensity corresponding to each light source frequency in the at least two light source frequencies; and acquiring target exposure parameters corresponding to the target light source frequency, and carrying out exposure processing according to the target exposure parameters.
The embodiment of the invention provides an exposure adjusting method, which is applied to electronic equipment, wherein each functional module in the electronic equipment can be cooperatively realized by hardware resources of the electronic equipment, such as computing resources of a processor and the like, and communication resources (such as being used for supporting and realizing communication in various modes of optical cables, honeycomb and the like).
Of course, the embodiments of the present invention are not limited to being provided as methods and hardware, and may be provided as a storage medium (storing instructions for executing the object processing method provided in the embodiments of the present application) in various implementations.
An embodiment of the present invention provides an exposure adjustment method, as shown in fig. 1, including:
s101, acquiring at least two light source frequencies in the current environment and frequency intensity corresponding to each light source frequency in the at least two light source frequencies through a color temperature sensor.
The electronic equipment is provided with the color temperature sensor, and the color temperature of the light source in the space environment can be collected through the color temperature sensor.
Optionally, one light source is included in the current spatial environment, and the light source is capable of operating at multiple light source frequencies. Optionally, the current spatial environment includes a plurality of light sources, and the light source frequencies of different light sources are different, and the corresponding light source frequency of one light source may be one or more.
In this embodiment of the application, when the light source frequency of the light source collected by the color temperature sensor only includes one light source frequency, the electronic device directly executes S103 with the collected light source frequency as the target light source frequency.
In one embodiment, the implementation of S101, as shown in fig. 2, includes:
and S1011, sensing the ambient light in the current space environment through the color temperature sensor to obtain an electric signal.
Here, the electronic device senses ambient light in the current spatial environment through a color temperature sensor, which converts an ambient light signal into an electrical signal.
And S1012, sampling the electric signal through a specified sampling frequency to obtain a sampling signal.
Here, the size of the specified sampling frequency may be set according to actual requirements.
S1013, performing time-frequency conversion on the sampling signal to obtain at least two light source frequencies and frequency intensity corresponding to each of the at least two light source frequencies.
Here, the algorithm used for performing the time-frequency conversion may be Fast Fourier Transform (FFT) or the like. The algorithm used for video conversion in the embodiment of the present invention may be set according to actual requirements, which is not limited in the embodiment of the present invention.
In an example, a frequency domain diagram of a sampled signal after time-frequency conversion is shown in fig. 3, and the acquired light source frequencies include: 100. 210, 300, 405, and 510, the frequency intensity corresponding to each light source frequency is: 105000, 10800, 300, 200, and 100. In fig. 3, the horizontal axis represents frequency, and the vertical axis represents frequency intensity.
S102, selecting a target light source frequency from the at least two light source frequencies according to the frequency intensity corresponding to each light source frequency in the at least two light source frequencies.
After obtaining the at least two light source frequencies and the frequency intensities corresponding to the light source frequencies based on S101, the electronic device selects a target light source frequency from the at least two light source frequencies according to the frequency intensities corresponding to the light source frequencies.
In the embodiment of the invention, the target light source frequency is selected from at least two light source frequencies based on a target light source selection strategy, wherein the light source selection strategy can be set based on the frequency intensity, the duration of the frequency intensity and the stability degree of the light source. Such as: and taking the light source frequency corresponding to the strongest frequency intensity as the target light source frequency, taking the light source frequency with the longest duration of keeping the current frequency intensity as the target light source frequency, and taking the light source frequency with the highest stability as the target light source frequency.
Taking the light source frequency corresponding to the strongest frequency intensity as the target light source frequency as an example, the frequency intensities corresponding to the light source frequencies in at least two light source frequencies are compared, and the light source frequency with the longest duration of the current frequency intensity is taken as the target light source frequency. Such as: the light source frequency includes: 100. 210, 300, 405, and 510, the frequency intensity corresponding to each light source frequency is: 105000, 10800, 300, 200, and 100, the light source frequency 100 is set as the target light source frequency.
Taking the light source frequency with the longest duration of intensity holding at the current frequency as the target light source frequency as an example, the duration of holding the current frequency intensity at each light source frequency within the specified time period is determined, and the light source frequency with the longest duration is taken as the target light source frequency. Wherein the specified time period may be a sampling period. In one example, if the duration of the light source frequency 100 at the frequency intensity 105000 is 2s, the duration of the light source frequency 210 at the frequency intensity 10800 is 6s, the light source frequency 300 at the frequency intensity 300 is 5s, the duration of the light source frequency 405 at the frequency intensity 200 is 2s, and the duration of the light source frequency 510 at the frequency intensity 100 is 1s within 10s, then the light source frequency 210 is taken as the target light source frequency.
Taking the light source frequency with the highest stability as the target light source frequency, as shown in fig. 4, the implementation of S102 includes:
s1021, determining the stability corresponding to each light source frequency according to the frequency intensity corresponding to each light source frequency in the at least two light source frequencies.
And S1022, determining the light source frequency with the corresponding stability degree meeting the stability condition as the target light source frequency.
The calculation of the stability of the frequency of the light source may include one of:
the method comprises the following steps of firstly, variance of frequency intensity of light source frequency;
and the second mode is the ratio of the current frequency intensity corresponding to the light source frequency in the included frequency intensity.
Taking the way of calculating the stability of the light source frequency as an example, S1021 includes: for each of the at least two light source frequencies, performing the following: and determining the variance of the frequency intensity of the first appointed times corresponding to the light source frequency to obtain the stability corresponding to the light source frequency.
Here, the frequency intensity of the first designated number of times for each light source frequency is acquired, and for each light source frequency, the variance of the frequency intensity of the first designated number of times is calculated, and the stability degree corresponding to each light source frequency is obtained. The first designated times can be set according to actual requirements, such as: 5 times and 10 times.
In the embodiment of the invention, each sampling signal obtains corresponding frequency data based on time-frequency transformation, and the frequency data comprises: the light source frequency and the frequency intensity corresponding to each light source frequency. For a light source frequency, the frequency data corresponding to the latest first specified sampling signal includes the frequency intensity of the first specified times corresponding to the light source frequency. When the frequency intensity corresponding to a light source frequency is determined, if the light source frequency does not exist in certain frequency data, the frequency intensity of the light source frequency at this time is determined to be 0.
In one example, the current light source frequency includes: the light source frequency a and the light source frequency B, the current corresponding frequency intensities of the light source frequency a and the light source frequency B are SA1 and SB1, respectively, and when the first designated number of times is 5, the latest 5 frequency intensities of the light source frequency a are: SA1, SA2, SA3, SA4 and SA5, wherein the latest 5-time frequency intensities of the light source frequency B are respectively: SB1, SB2, SB3, SB4 and SB5, the variance of SA1, SA2, SA3, SA4 and SA5 is calculated to obtain DA, and the variance of SB1, SB2, SB3, SB4 and SB5 is calculated to obtain DB, so that the stability degree corresponding to the light source frequency A is DA and the stability degree corresponding to the light source frequency B is DB.
At this time, the stability conditions include: less than a specified threshold; s1022 includes: determining the light source frequency for which the corresponding variance is less than the specified threshold as the target light source frequency.
In one example, as in the above example, when both DA and DB are less than a specified threshold DrefThen the target light source frequency includes: a light source frequency A and a light source frequency B; when DA is less than a specified threshold DrefDB greater than a specified threshold DrefThen the target light source frequency includes: the source frequency a.
Taking the second method as an example of the calculation method of the stability of the light source frequency, S1021 includes:
for each of the at least two light source frequencies, performing the following:
determining the target times of frequency intensity which is greater than a specified intensity threshold value in the frequency intensity of the second specified times of the light source frequency; determining a ratio of the target number of times to the second specified number of times.
Here, the frequency intensity of the second specified times of each light source frequency is acquired, and for each light source frequency, a target time of the second specified times, in which the frequency intensity is greater than a specified intensity threshold, is calculated, and the ratio of the target time corresponding to each light source frequency to the second specified time is taken as the stability corresponding to the corresponding light source frequency. Wherein, the second specified number of times can be set according to actual demand, for example: 5 times and 10 times. In the embodiment of the present invention, the second designated times may be the same as or different from the first designated times.
In the embodiment of the invention, each sampling signal obtains corresponding frequency data based on time-frequency transformation, and the frequency data comprises: the light source frequency and the frequency intensity corresponding to each light source frequency. For a light source frequency, the frequency data corresponding to the last second specified sampling signal includes the frequency intensity of the second specified times corresponding to the light source frequency. When the frequency intensity corresponding to a light source frequency is determined, if the light source frequency does not exist in certain frequency data, the frequency intensity of the light source frequency at this time is determined to be 0.
In one example, the current light source frequency includes: the current corresponding frequency intensities of the light source frequency a and the light source frequency B are SA1 and SB1, respectively, and when the second specified number of times is 5, the latest 5 frequency intensities of the light source frequency a are: SA1, SA2, SA3, SA4, and SA5, and the frequency intensities of SA1, SA2, SA3, SA4, and SA5 that are greater than a specified intensity threshold T include: SA1, SA2, SA3 and SA5, SA4 being less than a specified intensity threshold T, the target number is 4, the ratio of the target number to said second specified number is: 80%, in this case, the stability degree corresponding to the light source frequency a may be 80%; the nearest 5-time frequency intensities of the light source frequency B are respectively: SB1, SB2, SB3, SB4, and SB5, and the frequency intensities of SB1, SB2, SB3, SB4, and SB5 that are greater than a specified intensity threshold T include: SB1, SB4, and SB5, SB2, and SB3 are less than the specified intensity threshold T, the target number is 3, and the light source frequency B stability degree is: 60 percent.
In the embodiment of the present invention, the size of the designated intensity threshold T may be set according to actual requirements, which is not limited in the embodiment of the present invention.
At this time, the stability conditions include: greater than a specified threshold; s1022 includes: and determining the light source frequency of which the corresponding ratio is greater than the specified ratio as the target light source frequency.
In the embodiment of the present invention, the size of the specified ratio may be set according to actual requirements, which is not limited in the embodiment of the present invention.
In an example, as in the above example, when the specified ratio is 50%, the ratio 80% corresponding to the light source frequency a and the ratio 60% corresponding to the frequency B are both greater than the specified ratio, the target light source frequency includes: a light source frequency A and a light source frequency B; when the designated ratio is 70%, 80% of the ratio corresponding to the light source frequency a is greater than the designated ratio, and 60% of the ratio corresponding to the light source frequency B is less than the designated ratio, the target light source frequency includes: the source frequency a.
In the embodiment of the present invention, the number of the determined target light sources may be one or more.
In the embodiment of the invention, when the stability degree is the variance of the frequency intensity of the first specified times, the stability and the variance are in an inverse proportional relation, and the smaller the variance is, the more stable the light source frequency is. When the stability degree is the ratio of the target times to the second specified times, the stability is in direct proportion to the ratio, and the larger the ratio is, the more stable the light source frequency is.
S103, acquiring a target exposure parameter corresponding to the light source frequency of the target light source, and performing exposure processing according to the target exposure parameter.
After the target light source frequency is determined, the electronic equipment obtains a target exposure parameter corresponding to the target light source frequency based on the corresponding relation between the light source frequency and the exposure parameter, so as to perform exposure processing through the target exposure parameter.
In the embodiment of the invention, the electronic equipment sets a plurality of corresponding relations, and different corresponding relations comprise different light source frequencies and different exposure parameters.
In one embodiment, the exposure parameters include: exposure time; when at least two target light source frequencies exist, the acquiring of the target exposure parameters corresponding to the target light source frequencies includes: acquiring a light source period corresponding to each target light source frequency in the at least two target light source frequencies; and determining integral multiples of the least common multiple of the light source period corresponding to each target light source frequency as the exposure time.
When only one target light source frequency exists, the exposure time is integral multiple of the light source period corresponding to the target light source frequency.
The light source period can be calculated according to the target light source frequency f. In one example, the light source period t is calculated by equation (1):
t is 1/f formula (1).
Such as: the target light source frequencies include f1 and f2, and the corresponding light source periods are t1 and t2, wherein t1 is 1/f1, and t2 is 1/f2, so that the exposure time is an integral multiple of the least common multiple of t1 and t 2. Here, the operating frequency of the ac power corresponding to the light source frequency f1 is f1/2, and the operating frequency of the ac power corresponding to the light source frequency f2 is f 2/2.
Such as: when the target light source frequency is 100HZ, the corresponding light source period is 1/100 ═ 0.01, i.e., 10ms, and the exposure time corresponding to the light source frequency of 100HZ is an integral multiple of 10 ms. Here, when the light source frequency is 100HZ, the operating frequency of the corresponding alternating current is 50 HZ.
In the embodiment of the present invention, the corresponding relationship corresponding to each light source frequency may be stored in the form of an exposure table, where the exposure table may be identified as exp. Such as: the exposure table corresponding to the light source frequency A is identified as expA, the exposure table corresponding to the light source frequency 100HZ is identified as exp100, and the exposure table corresponding to the light source frequency A and the light source frequency B is identified as expAB.
In the embodiment of the present invention, the exposure parameters further include: gain, etc. control the parameters of exposure convergence.
In the embodiment of the invention, under the same environmental condition, when the brightness needing exposure is the same, the exposure time is inversely proportional to the gain. When the exposure time is increased, the gain is decreased; when the exposure time is decreased, the gain is increased.
According to the exposure adjusting method provided by the embodiment of the invention, the multiple light source frequencies in the real environment are obtained through the color temperature sensor, the target light source frequency for carrying out the exposure condition is selected from the multiple light source frequencies according to the frequency intensity of each light source, and the exposure processing of flicker elimination is carried out based on the target light source frequency, so that the method is suitable for the complex light source scene with multiple light sources or one light source with multiple frequencies, and the accurate exposure is carried out under the scene with the light sources with multiple frequencies.
In this embodiment of the present invention, S103 may be implemented as: when the target light source frequency is changed from a first target light source frequency to a second target light source frequency, acquiring a second exposure parameter corresponding to the second target light source frequency, and switching the target exposure parameter for exposure processing from a first exposure parameter corresponding to the first target light source frequency to the second exposure parameter, so as to perform exposure processing through the second exposure parameter.
The number of light source frequencies in the first target light source frequency may be one or more; the number of light source frequencies in the second target light source frequency may be one or more. In one example, the target light source frequency is varied from a light source frequency a to a light source frequency a and a light source frequency B. In one example, the target light source frequency is varied from light source frequency a to light source frequency B and light source frequency 100.
Here, during the exposure, the light source frequency of the light source of the current spatial environment and the frequency intensity corresponding to each light source frequency may be collected in real time by the color temperature sensor, and the target light source may be determined from the collected one or more light source frequencies in real time. When the frequency intensity corresponding to the light source frequency or the light source frequency changes, which causes the target light source determined by the electronic equipment to change, the target exposure parameters for exposure processing are adjusted, and the first exposure parameters corresponding to the original first light source frequency are adjusted to the second exposure parameters corresponding to the newly determined second source frequency, so that the electronic equipment can adapt to the change of the light source frequency in the space environment quickly, and the exposure can be switched quickly and stably.
According to the exposure adjusting method provided by the embodiment of the invention, the introduced color temperature sensor obtains frequency data of the light source in a real environment, and can obtain a plurality of light source frequencies of the current light source, so that not only can an exposure table be set for a single light source frequency to carry out exposure processing for eliminating flicker, but also a plurality of exposure tables of complex ambient light can be set simultaneously, and the exposure can be rapidly and stably switched when the light source frequency is actively changed, so that the coverage scene is wider.
In an embodiment, as shown in fig. 5, before S102, the method further includes:
and S104, sequencing the at least two light source frequencies according to the sequence of the frequency intensities from large to small.
S105, according to the sorting result, the light source frequencies which are out of the at least two light source frequencies and are positioned in the appointed order are screened out from the at least two light source frequencies.
Here, in S101, the light source frequencies existing in the spatial environment and the frequency intensities corresponding to the light source frequencies are obtained, the light source frequency with the smaller frequency intensity is screened out from the plurality of light source frequencies collected by the color temperature sensor according to the frequency intensity corresponding to the light source frequencies, and only the light source frequency with the larger frequency intensity is retained, in this case, S102 is executed: and selecting a target light source frequency from the reserved at least two light source frequencies according to the frequency intensity corresponding to each light source frequency in the reserved at least two light source frequencies.
In one example, the color temperature sensor collects a plurality of light source frequencies and the frequency intensity corresponding to each light source frequency as shown in fig. 3, and the collected light source frequencies include: 100. 210, 300, 405, and 510, the frequency intensity corresponding to each light source frequency is: 105000, 10800, 300, 200, and 100; the light source frequency is sequenced according to the frequency intensity to obtain a sequencing result: 100. 210, 300, 405, and 510, when the designated order is 2, then 300, 405, and 510 are culled, only 100 and 210 are retained, and S102 and S103 are performed based on 100 and 210.
In one embodiment, in the sorting, the light source frequencies with frequency intensity greater than a specified frequency intensity threshold value in the light source frequencies collected by the color temperature sensor are sorted. Such as: when the designated frequency intensity threshold is 1000, the collected light source frequencies include: 100. 210, 300, 405, and 510, the frequency intensity corresponding to each light source frequency is: 105000, 10800, 300, 200, and 100; then only 100 and 210 are sorted and when the specified order is 2, then 300, 405, and 510 are sifted out.
The exposure adjusting method provided by the embodiment of the invention comprehensively analyzes the acquired light source frequency, selects the relatively stable light source frequency for exposure convergence, provides a more practical exposure strategy and realizes quick and stable exposure.
The exposure adjustment method provided by the embodiment of the invention is illustrated in a specific application scenario.
The electronic device utilizes the frequency signal collected by the color temperature sensor to assist the exposure adjustment, and the implementation flow is as shown in fig. 6, and includes:
and S601, collecting data through a color temperature sensor.
And S602, calculating the light source frequency.
And S603, converging exposure.
In S601, the ambient light signal is converted into an electrical signal by the color sensor, the electrical signal is sampled based on the set fixed sampling frequency to obtain sampling data, and the sampling data is transmitted and stored.
In S602, FFT conversion is performed on the sample data, and a plurality of light source frequencies H included in the ambient light are outputi(i ═ 0,1, 2.., N) and frequency intensity Si(i ═ 0,1, 2.., N), the light source frequencies whose frequency intensities are greater than the specified frequency intensity threshold S _ Th are sorted according to frequency intensity, and the corresponding light source frequency H _ A, H _ B and the corresponding frequency intensities S _ a and S _ B are sequentially output according to frequency intensity.
In one example, when S _ Th is 100, the sampled light source frequency and the corresponding frequency intensity are as shown in fig. 3, and the output light source frequency and the corresponding frequency intensity include: h _ a equals 100, S _ a equals 105000, H _ B equals 210, S _ B equals 10800.
In S603, the output light source frequency is comprehensively analyzed, a relatively stable light source frequency is selected for exposure design, a more realistic exposure strategy is proposed, and rapid and stable exposure is realized.
The implementation of the exposure adjustment method provided by the embodiment of the present invention can be shown in fig. 7, and includes:
and S701, setting an exposure table corresponding to the light source frequency.
Here, the exposure table set includes: expA, expB, expAB and exp 100. The expA is an exposure table corresponding to the light source frequency H _ A, the exposure time in the expA is an integral multiple of a light source period corresponding to the light source frequency H _ A, the expB is an exposure table corresponding to the light source frequency H _ B, the exposure time in the expB is an integral multiple of a light source period corresponding to the light source frequency H _ B, the expAB is an exposure table corresponding to the light source frequencies H _ A and H _ B, and the exposure time in the expAB is an integral multiple of a least common multiple of a light source period corresponding to the light source frequency H _ A and a light source period corresponding to the light source frequency H _ B. exp100 is an exposure table corresponding to the light source frequency 100HZ, and the exposure time in exp100 is an integral multiple of 10 ms.
S702, acquiring the light source frequency and the corresponding frequency intensity for N times continuously.
S703, judging whether the light source corresponding to the light source frequency H _ A is stable.
When the light source frequency H _ a is stable, S704 is executed; when the light source frequency H _ a is unstable, S705 is performed.
S704, whether the light source corresponding to the light source frequency H _ B is stable or not is judged.
When the light source frequency H _ B is stable, S706 is executed to switch the exposure table to expAB; when the light source frequency H _ B is unstable, S707 is executed to switch the exposure table to expA.
S705, whether the light source corresponding to the light source frequency H _ B is stable is judged.
When the light source frequency H _ B is stable, S708 is executed to switch the exposure table to expB; when the light source frequency H _ B is unstable, S709 is executed to switch the exposure table to exp 50.
And S710, carrying out exposure convergence through an exposure table.
In the embodiment of the present application, whether the frequency of the light source is stable is determined according to the stability condition. Based on the stability condition, the determination mode includes one of the following:
(1) carrying out variance analysis on the light source frequency for N times, and selecting the light source frequency with smaller variance as the more stable light source frequency;
(2) the light source frequency HA is greater than 0;
(3) and taking the frequency intensity of the continuous N times of light source frequency as a factor of considering the stability of the light source frequency. And if the frequency intensity of N/5 times (N > -5) times in the N times is less than the specified intensity threshold value T, evaluating that the current light source frequency is unstable. Here, if there are N/5(N > ═ 5) of the N times of frequency intensity smaller than the specified threshold T, the light source is characterized to be weak.
In the embodiment of the invention, the exposure convergence is carried out based on the stable frequency light source, so that the unstable exposure caused by the repeated fluctuation of various light source frequencies can be avoided, and the method is suitable for the following scenes: scenes in which a plurality of light source frequencies coexist and an instantaneous strong light source frequency occurs, such as instantaneous flickering of automobile tail lights and the like.
In the embodiment of the application, the exposure time is integral multiple of the light source period, so that the problem of image flicker is solved. Different light source frequencies correspond to different exposure tables. In practical applications, the higher the light source frequency, the larger the adjustable range of the exposure meter. The lower the frequency of the light source, the smaller the range over which the exposure meter can be adjusted. When the adjustment range of the exposure table is large, iterative exposure is carried out by adopting large exposure compensation, and the exposure time is shortened; when the exposure adjustment range is small, iteration is performed by adopting small exposure compensation, and the stability is improved, so that the rapid and accurate exposure adjustment is met.
In order to implement the exposure adjustment method, an embodiment of the present invention further provides an exposure adjustment apparatus implemented on an electronic device, where the exposure adjustment apparatus has a structure, as shown in fig. 8, and the exposure adjustment apparatus 800 includes:
the acquisition unit 801 is configured to acquire at least two light source frequencies in a current environment and frequency intensities corresponding to each of the at least two light source frequencies through a color temperature sensor;
a selecting unit 802, configured to select a target light source frequency from the at least two light source frequencies according to a frequency intensity corresponding to each light source frequency in the at least two light source frequencies;
a convergence unit 803, configured to obtain a target exposure parameter corresponding to the target light source frequency, and perform exposure processing according to the target exposure parameter.
In the embodiment of the present invention, the acquisition unit 801 includes:
the color temperature sensor module is used for sensing the ambient light in the current space environment to obtain an electric signal;
the sampling module is used for sampling the electric signal through a specified sampling frequency to obtain a sampling signal;
and the conversion module is used for carrying out time-frequency conversion on the sampling signal to obtain at least two light source frequencies and the frequency intensity corresponding to each light source frequency in the at least two light source frequencies.
In this embodiment of the present invention, the selecting unit 802 includes:
the first determining module is used for determining the stability degree corresponding to each light source frequency according to the frequency intensity corresponding to each light source frequency in the at least two light source frequencies;
and the second determining module is used for determining the light source frequency of which the corresponding stability degree meets the stability condition as the target light source frequency.
In an embodiment of the present invention, the first determining module is configured to perform the following processing for each of the at least two light source frequencies:
determining the variance of the frequency intensity of the first appointed times corresponding to the light source frequency to obtain the stability degree corresponding to the light source frequency;
the second determining module is configured to determine, as the target light source frequency, a light source frequency for which the corresponding variance is smaller than the specified threshold.
In an embodiment of the present invention, the first determining unit is configured to perform the following processing for each of the at least two light source frequencies:
determining the target times of frequency intensity which is greater than a specified intensity threshold value in the frequency intensity of the second specified times of the light source frequency;
determining a ratio of the target number of times to the second specified number of times;
the second determining unit is configured to determine, as the target light source frequency, a light source frequency for which a corresponding ratio is greater than the specified ratio.
In the embodiment of the present invention, the apparatus further includes: a screening unit for:
before selecting a target light source frequency from the at least two light source frequencies according to the frequency intensity corresponding to each light source frequency in the at least two light source frequencies, sequencing the at least two light source frequencies according to the sequence of the frequency intensities from large to small;
and according to the sequencing result, screening out the light source frequencies which are out of the specified sequence from the at least two light source frequencies.
In this embodiment of the present invention, the convergence unit 803 is further configured to:
when at least two target light source frequencies exist, acquiring a light source period corresponding to each light source frequency in the at least two light source frequencies; and determining integral multiples of the least common multiple of the light source period corresponding to each light source frequency as the exposure time included by the exposure parameters.
In this embodiment of the present invention, the convergence unit 803 is further configured to:
when the target light source frequency is changed from a first target light source frequency to a second target light source frequency, acquiring a second exposure parameter corresponding to the second target light source frequency, and switching the target exposure parameter for exposure processing from a first exposure parameter corresponding to the first target light source frequency to the second exposure parameter, so as to perform exposure processing through the second exposure parameter.
The color temperature sensing module in the exposure adjusting device provided by the embodiment of the invention can be realized based on a color temperature sensor.
The embodiment of the present invention further provides an electronic device, which includes a processor and a memory for storing a computer program capable of running on the processor, wherein the processor is configured to execute the steps of the exposure adjustment method executed by the electronic device when running the computer program.
Fig. 9 is a schematic diagram of a hardware component structure of an electronic device according to an embodiment of the present invention, where the electronic device 900 includes: at least one processor 901, memory 902, and at least one network interface 904. Various components in the electronic device 900 are coupled together by a bus system 905. It is understood that the bus system 905 is used to enable communications among the components. The bus system 905 includes a power bus, a control bus, and a status signal bus, in addition to a data bus. For clarity of illustration, however, the various buses are labeled in fig. 9 as bus system 905.
It will be appreciated that the memory 902 can be either volatile memory or nonvolatile memory, and can include both volatile and nonvolatile memory. The non-volatile Memory may be ROM, Programmable Read-Only Memory (PROM), erasable Programmable Read-Only Memory (EPROM), electrically erasable Programmable Read-Only Memory (EEPROM), magnetic random access Memory (FRAM), Flash Memory (Flash Memory), magnetic surface Memory, optical Disc, or Compact Disc Read-Only Memory (CD-ROM); the magnetic surface storage may be disk storage or tape storage. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of illustration and not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Synchronous Static Random Access Memory (SSRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), Double data rate Synchronous Dynamic Random Access Memory (DDRSDRAM, Double DataRateSync Synchronous Random Access Memory), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM, Enhanced Synchronous Dynamic Random Access Memory), Synchronous link Dynamic Random Access Memory (SLDRAM, Synchronous Dynamic Random Access Memory), Direct Memory (DRmb Random Access Memory, Random Access Memory). The memory 902 described in connection with the embodiments of the invention is intended to comprise, without being limited to, these and any other suitable types of memory.
The memory 902 in embodiments of the present invention is used to store various types of data to support the operation of the electronic device 900. Examples of such data include: any computer program for operating on the electronic device 900, such as application 9021. A program implementing the method of an embodiment of the present invention may be included in application 9021.
The method disclosed in the above embodiments of the present invention may be applied to the processor 901, or implemented by the processor 901. The processor 901 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be implemented by integrated logic circuits of hardware or instructions in the form of software in the processor 901. The Processor 901 may be a general purpose Processor, a Digital Signal Processor (DSP), or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. Processor 901 may implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed by the embodiment of the invention can be directly implemented by a hardware decoding processor, or can be implemented by combining hardware and software modules in the decoding processor. The software modules may be located in a storage medium located in the memory 902, and the processor 901 reads the information in the memory 902 and performs the steps of the aforementioned methods in combination with its hardware.
In an exemplary embodiment, the electronic Device 900 may be implemented by one or more Application Specific Integrated Circuits (ASICs), DSPs, Programmable Logic Devices (PLDs), Complex Programmable Logic Devices (CPLDs), FPGAs, general purpose processors, controllers, MCUs, MPUs, or other electronic components for performing the aforementioned methods.
The embodiment of the invention also provides a storage medium for storing the computer program.
Optionally, the storage medium may be applied to the electronic device in the embodiment of the present invention, and the computer program enables the computer to execute corresponding processes in each method in the embodiment of the present invention, which is not described herein again for brevity.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (20)
1. An exposure adjustment method, characterized in that the method comprises:
acquiring at least two light source frequencies in the current environment and frequency intensity corresponding to each light source frequency in the at least two light source frequencies through a color temperature sensor;
selecting a target light source frequency from the at least two light source frequencies according to the frequency intensity corresponding to each light source frequency in the at least two light source frequencies;
and acquiring target exposure parameters corresponding to the target light source frequency, and carrying out exposure processing according to the target exposure parameters.
2. The method of claim 1, wherein the acquiring, by a color temperature sensor, the at least two light source frequencies in the current environment and the frequency intensities corresponding to each of the at least two light source frequencies comprises:
sensing ambient light in the current space environment through the color temperature sensor to obtain an electric signal;
sampling the electric signal through a specified sampling frequency to obtain a sampling signal;
and performing time-frequency conversion on the sampling signal to obtain at least two light source frequencies and frequency intensity corresponding to each light source frequency in the at least two light source frequencies.
3. The method of claim 1, wherein selecting a target light source frequency from the at least two light source frequencies according to the frequency intensity corresponding to each of the at least two light source frequencies comprises:
determining the stability degree corresponding to each light source frequency according to the frequency intensity corresponding to each light source frequency in the at least two light source frequencies;
and determining the light source frequency with the corresponding stability degree meeting the stability condition as the target light source frequency.
4. The method of claim 3, wherein determining the stability level for each of the at least two light source frequencies according to the frequency intensity for each of the light source frequencies comprises:
for each of the at least two light source frequencies, performing the following:
and determining the variance of the frequency intensity of the first appointed times corresponding to the light source frequency to obtain the stability corresponding to the light source frequency.
5. The method of claim 4, wherein the stability condition comprises: less than a specified threshold; the determining the light source frequency with the corresponding stability degree satisfying the stability condition as the target light source frequency includes:
determining the light source frequency for which the corresponding variance is less than the specified threshold as the target light source frequency.
6. The method of claim 3, wherein determining the stability level for each of the at least two light source frequencies according to the frequency intensity for each of the light source frequencies comprises:
for each of the at least two light source frequencies, performing the following:
determining the target times that the frequency intensity is greater than a specified intensity threshold value in the frequency intensity of the second specified times corresponding to the light source frequency;
determining a ratio of the target number of times to the second specified number of times.
7. The method of claim 6, wherein the stability condition comprises: greater than a specified ratio; the determining the light source frequency with the corresponding stability degree satisfying the stability condition as the target light source frequency includes:
and determining the light source frequency of which the corresponding ratio is greater than the specified ratio as the target light source frequency.
8. The method of any of claims 1 to 7, wherein prior to selecting a target light source frequency from the at least two light source frequencies based on the frequency intensity corresponding to each of the at least two light source frequencies, the method further comprises:
sequencing the at least two light source frequencies according to the sequence of the frequency intensities from large to small;
and according to the sequencing result, screening out the light source frequencies which are out of the specified sequence from the at least two light source frequencies.
9. The method of claims 1 to 7, wherein the exposure parameters comprise: exposure time; when at least two target light source frequencies exist, the acquiring of the target exposure parameters corresponding to the target light source frequencies includes:
acquiring a light source period corresponding to each target light source frequency in the at least two target light source frequencies;
and determining integral multiples of the least common multiple of the light source period corresponding to each target light source frequency as the exposure time.
10. The method according to any one of claims 1 to 7, wherein acquiring target exposure parameters corresponding to the target light source frequency and performing exposure processing according to the target exposure parameters comprises:
when the target light source frequency is changed from a first target light source frequency to a second target light source frequency, acquiring a second exposure parameter corresponding to the second target light source frequency, and switching the target exposure parameter for exposure processing from a first exposure parameter corresponding to the first target light source frequency to the second exposure parameter, so as to perform exposure processing through the second exposure parameter.
11. An exposure adjustment apparatus, characterized in that the apparatus comprises:
the acquisition unit is used for acquiring at least two light source frequencies in the current environment and the frequency intensity corresponding to each light source frequency in the at least two light source frequencies through the color temperature sensor;
a selecting unit, configured to select a target light source frequency from the at least two light source frequencies according to a frequency intensity corresponding to each of the at least two light source frequencies;
and the convergence unit is used for acquiring a target exposure parameter corresponding to the target light source frequency and carrying out exposure processing according to the target exposure parameter.
12. The apparatus of claim 11, wherein the acquisition unit comprises:
the color temperature sensor module is used for sensing the ambient light in the current space environment to obtain an electric signal;
the sampling module is used for sampling the electric signal through a specified sampling frequency to obtain a sampling signal;
and the conversion module is used for carrying out time-frequency conversion on the sampling signal to obtain at least two light source frequencies and the frequency intensity corresponding to each light source frequency in the at least two light source frequencies.
13. The apparatus of claim 11, wherein the selection unit comprises:
the first determining module is used for determining the stability degree corresponding to each light source frequency according to the frequency intensity corresponding to each light source frequency in the at least two light source frequencies;
and the second determining module is used for determining the light source frequency of which the corresponding stability degree meets the stability condition as the target light source frequency.
14. The apparatus of claim 13,
the first determining module is configured to perform the following processing for each of the at least two light source frequencies:
determining the variance of the frequency intensity of the first appointed times corresponding to the light source frequency to obtain the stability degree corresponding to the light source frequency;
the second determining module is configured to determine, as the target light source frequency, a light source frequency for which the corresponding variance is smaller than the specified threshold.
15. The apparatus of claim 13,
the first determining unit is configured to perform the following processing for each of the at least two light source frequencies:
determining the target times of frequency intensity which is greater than a specified intensity threshold value in the frequency intensity of the second specified times of the light source frequency;
determining a ratio of the target number of times to the second specified number of times;
the second determining unit is configured to determine, as the target light source frequency, a light source frequency for which a corresponding ratio is greater than the specified ratio.
16. The apparatus of any one of claims 11 to 15, further comprising: a screening unit for:
before selecting a target light source frequency from the at least two light source frequencies according to the frequency intensity corresponding to each light source frequency in the at least two light source frequencies, sequencing the at least two light source frequencies according to the sequence of the frequency intensities from large to small;
and according to the sequencing result, screening out the light source frequencies which are out of the specified sequence from the at least two light source frequencies.
17. The apparatus according to any one of claims 11 to 15, wherein the convergence unit is further configured to:
when at least two target light source frequencies exist, acquiring a light source period corresponding to each light source frequency in the at least two light source frequencies;
and determining integral multiples of the least common multiple of the light source period corresponding to each light source frequency as the exposure time included by the exposure parameters.
18. The apparatus according to any one of claims 11 to 15, wherein the convergence unit is further configured to:
when the target light source frequency is changed from a first target light source frequency to a second target light source frequency, acquiring a second exposure parameter corresponding to the second target light source frequency, and switching the target exposure parameter for exposure processing from a first exposure parameter corresponding to the first target light source frequency to the second exposure parameter, so as to perform exposure processing through the second exposure parameter.
19. An electronic device comprising a processor and a memory configured to store a computer program operable on the processor, wherein the processor is configured to execute the steps of the exposure adjustment method of any of claims 1 to 10 when executing the computer program.
20. A storage medium storing an executable program, wherein the executable program, when executed by a processor, implements the exposure adjustment method of any one of claims 1 to 10.
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