CN112188073B - Hybrid focus control method and device - Google Patents
Hybrid focus control method and device Download PDFInfo
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- CN112188073B CN112188073B CN201910590160.9A CN201910590160A CN112188073B CN 112188073 B CN112188073 B CN 112188073B CN 201910590160 A CN201910590160 A CN 201910590160A CN 112188073 B CN112188073 B CN 112188073B
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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
- H04N23/40—Circuit details for pick-up tubes
- H04N23/41—Beam current control
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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
- H04N23/60—Control of cameras or camera modules
- H04N23/67—Focus control based on electronic image sensor signals
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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
- H04N23/72—Combination of two or more compensation controls
Abstract
The invention relates to the technical field of ray tubes, in particular to a mixed focus control method and a device, wherein the method comprises the steps of obtaining exposure parameters and presetting tube current; when the exposure parameter is larger than the maximum exposure parameter corresponding to the small focus and smaller than the preset multiple of the maximum exposure parameter corresponding to the large focus, determining to adopt the large focus and the small focus for simultaneous exposure; dividing the preset tube current into a first preset tube current corresponding to a small focus and a second preset tube current corresponding to a large focus according to a preset proportion; and adjusting the filament currents corresponding to the small focus and the large focus according to the first preset tube current and the second preset tube current so as to realize automatic exposure. The large focus and the small focus are exposed simultaneously, and on the basis of presetting tube current, the presetting tube current is divided into first presetting tube current and second presetting tube current corresponding to the small focus and the large focus by utilizing a preset proportion, so that the problem of early failure of the ray tube caused by unilateral reasons of the small focus is prevented.
Description
Technical Field
The invention relates to the technical field of ray tubes, in particular to a method and a device for controlling a mixed focus.
Background
The ray tube (also called bulb) is a key component of ray machine, and is composed of cathode filament and anode target surface. The tubes are classified according to the number of filaments and can be divided into single filament bulbs, double filament bulbs and triple filament bulbs. Each filament corresponds to a focus, and thus can be divided into a single-focus bulb, a double-focus bulb and a triple-focus bulb. Among them, the trifocal bulbs are mainly used for digital angiography (i.e., DSA), and the monofocal and bifocal bulbs are most used in practice. Under the same condition, the smaller the effective focus is, the better the imaging quality is, but the smaller the input power allowed by the bulb tube anode is, so that the imaging device is suitable for shooting small objects or thin parts (such as limbs) and other occasions with smaller power requirements. On the contrary, the larger the effective focus is, the poorer the imaging quality is, but the larger the input power allowed by the bulb anode is, so that the imaging device is suitable for some occasions with larger power requirements, such as shooting large objects or heavy parts (such as chest radiographs and lumbar vertebrae).
Therefore, in order to obtain a good imaging effect, the conventional method is as follows: the determination of which focal point to use for exposure is made on the basis of the exposure parameters required for radiography or fluoroscopic imaging (hereinafter referred to as exposure), i.e. only one focal point exposure is selected at any time. In order to achieve a better imaging effect, a user can frequently work in a mode of using a small focus and a long exposure time, and a large focus is less used. However, this exposure method results in faster aging of the small focus, which in turn causes premature failure of the bulb.
Disclosure of Invention
In view of this, embodiments of the present invention provide a hybrid focus control method and apparatus, so as to solve the problem in the prior art that a bulb fails in advance due to frequent use of a small focus.
According to a first aspect, an embodiment of the present invention provides a hybrid focus control method, including:
acquiring exposure parameters and preset tube current; wherein the exposure parameters comprise exposure power and exposure time;
when the exposure parameter is larger than the maximum exposure parameter corresponding to the small focus and smaller than a preset multiple of the maximum exposure parameter corresponding to the large focus, determining to adopt the large focus and the small focus for simultaneous exposure;
dividing the preset tube current into a first preset tube current corresponding to the small focus and a second preset tube current corresponding to the large focus according to a preset proportion;
and adjusting filament currents corresponding to the small focus and the large focus according to the first preset tube current and the second preset tube current to realize automatic exposure.
According to the mixed focus control method provided by the embodiment of the invention, when the exposure parameters meet the condition of simultaneous exposure of the large focus and the small focus, the large focus and the small focus are used for simultaneous exposure; on the basis of the acquired preset tube current, the preset tube current is divided into a first preset tube current and a second preset tube current corresponding to a small focus and a large focus by using a preset proportion, and the first preset tube current and the second preset tube current are subsequently used for realizing current carrying on the filament currents corresponding to the large focus and the small focus respectively, so that on the premise of meeting the acquired parameters, simultaneous exposure of the large focus and the small focus is realized, the use frequency of the large focus and the small focus is balanced, and the problem of early failure of the ray tube caused by unilateral reasons of the small focus is solved.
With reference to the first aspect, in a first implementation manner of the first aspect, the adjusting filament currents corresponding to the small focus and the large focus according to the first preset tube current and the second preset tube current to achieve automatic exposure includes:
determining a first preset filament current corresponding to the first preset tube current and a second preset filament current corresponding to the second preset tube current by using the first preset tube current and the second preset tube current;
acquiring a first current filament current corresponding to the small focus and a second current filament current corresponding to the large focus;
and based on the first preset filament current, the second preset filament current, the first current filament current and the second current filament current, performing closed-loop regulation on the filament currents corresponding to the small focus and the large focus respectively to realize automatic exposure.
According to the mixed focus control method provided by the embodiment of the invention, the first preset filament current and the second preset filament current can be determined by utilizing the corresponding relation between the tube current and the filament current, and meanwhile, the filament currents with the large focus and the small focus are respectively subjected to closed-loop regulation by utilizing the obtained current value of the filament current so as to ensure the exposure precision.
With reference to the first aspect or the first implementation manner, in a second implementation manner of the first aspect, the performing closed-loop adjustment on the filament currents corresponding to the small focus and the large focus based on the first preset filament current, the second preset filament current, the first present filament current, and the second present filament current includes:
acquiring current tube current;
respectively calculating a first filament current compensation quantity corresponding to the small focus and a second filament current compensation quantity corresponding to the large focus according to the preset proportion on the basis of the current tube current;
superposing the first filament current compensation quantity and the second filament current compensation quantity on the corresponding first preset filament current and the second preset filament current respectively to obtain a first filament current set value corresponding to the small focus and a second filament current set value corresponding to the large focus;
and performing closed-loop regulation on the filament currents corresponding to the small focus and the large focus respectively according to the first filament current set value, the second filament current set value, the first current filament current and the second current filament current.
According to the mixed focus control method provided by the embodiment of the invention, the obtained current tube current is divided into the first filament current compensation quantity and the second filament current compensation quantity according to the preset proportion, so that the filament currents of the large focus and the small focus are accurately adjusted, and the adjustment effect of the filament currents is ensured.
With reference to the second embodiment of the first aspect, in the third embodiment of the first aspect, the first preset tube current and the second preset tube current are expressed by the following formulas:
mAref1＝mAref*K；
mAref2＝mAref*(1-K)；
wherein mAref is the preset tube current, K is the preset ratio, mAref1 is the first preset tube current, and mAref2 is the second preset tube current.
With reference to the third embodiment of the first aspect, in the fourth embodiment of the first aspect, the first filament current setting value and the second filament current setting value are expressed by the following formulas:
If1＝If1_0+δIf1,δIf1＝δIf*K；
If2＝If2_0+δIf2,δIf2＝δIf*(1-K)；
wherein If1 is the first filament current setting value, If2 is the second filament current setting value, If1_0 is the first preset filament current, If2_0 is the second preset filament current, δ If1 is the first filament current compensation amount, and δ If2 is the second preset filament current compensation amount; δ If is the present tube current.
With reference to the first aspect, in a fifth implementation manner of the first aspect, before the determining to perform simultaneous exposure with large and small focuses when the exposure parameter exceeds the maximum exposure parameter corresponding to the small focus and is less than a preset multiple of the maximum exposure parameter corresponding to the large focus, the method includes:
calculating the product of the exposure power and the exposure time to obtain a preset heat quantity;
respectively searching a first exposure parameter table and a second exposure parameter table by using the preset heat to judge whether the preset heat is larger than a first maximum exposure heat corresponding to a small focus or not; the first exposure parameter table is used for representing the corresponding relation between the exposure power and the exposure time of the small focus, and the second exposure parameter table is used for representing the corresponding relation between the exposure power and the exposure time of the large focus; the first maximum exposure heat quantity is the maximum value of the product of the exposure power and the exposure time in the first exposure parameter table;
when the preset heat is larger than the first maximum exposure heat, judging whether the preset heat is smaller than a preset multiple of the second maximum exposure heat; wherein the second maximum exposure heat is a maximum value of a product of the exposure power and the exposure time in the second exposure parameter table.
According to the mixed focus control method provided by the embodiment of the invention, the working mode of the focus is determined by utilizing the preset heat, so that the focus is exposed simultaneously by adopting large and small focuses at higher power to obtain better imaging quality.
With reference to the fifth embodiment of the first aspect, in the sixth embodiment of the first aspect, the method further comprises:
when the preset heat is less than or equal to the first maximum exposure heat, determining to adopt the small focus exposure;
and when the preset heat is greater than or equal to the preset multiple of the second maximum exposure heat, determining to adopt large-focus exposure.
According to the mixed focus control method provided by the embodiment of the invention, in the exposure process, the large focus and the small focus can work in a time-sharing manner and also can work simultaneously, so that the large focus and the small focus can be used more reasonably, and the service life of the bulb tube is further prolonged.
According to a second aspect, an embodiment of the present invention also provides a hybrid focus control apparatus, including:
the acquisition module is used for acquiring exposure parameters and preset tube current; wherein the exposure parameters comprise exposure power and exposure time;
the exposure focus determining module is used for determining simultaneous exposure by adopting large and small focuses when the exposure parameters are larger than the maximum exposure parameters corresponding to the small focuses and smaller than the preset multiple of the maximum exposure parameters corresponding to the large focuses;
the tube current dividing module is used for dividing the preset tube current into a first preset tube current corresponding to the small focus and a second preset tube current corresponding to the large focus according to a preset proportion;
and the current adjusting module is used for adjusting filament currents corresponding to the small focus and the large focus according to the first preset tube current and the second preset tube current so as to realize automatic exposure.
According to the mixed focus control device provided by the embodiment of the invention, when the exposure parameters meet the condition of simultaneous exposure of the large focus and the small focus, the large focus and the small focus are used for simultaneous exposure; on the basis of the acquired preset tube current, the preset tube current is divided into a first preset tube current and a second preset tube current corresponding to a small focus and a large focus by using a preset proportion, and the first preset tube current and the second preset tube current are subsequently used for realizing current carrying on the filament currents corresponding to the large focus and the small focus respectively, so that on the premise of meeting the acquired parameters, simultaneous exposure of the large focus and the small focus is realized, the use frequency of the large focus and the small focus is balanced, and the problem of early failure of the ray tube caused by unilateral reasons of the small focus is solved.
According to a third aspect, an embodiment of the present invention provides an electronic device, including: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory having stored therein computer instructions, and the processor executing the computer instructions to perform the hybrid focus control method according to the first aspect or any one of the embodiments of the first aspect.
According to a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to execute the hybrid focus control method described in the first aspect or any one of the implementation manners of the first aspect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a hybrid focus control method according to an embodiment of the present invention;
FIG. 2 is a flow chart of a hybrid focus control method according to an embodiment of the present invention;
FIG. 3 is a flow chart of a hybrid focus control method according to an embodiment of the present invention;
FIG. 4 is a flow chart of a hybrid focus filament current control method according to an embodiment of the present invention;
FIG. 5 is a flow chart of a hybrid focus control method according to an embodiment of the present invention;
fig. 6 is a block diagram of the configuration of a hybrid focus control apparatus according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a hardware structure 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 embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In accordance with an embodiment of the present invention, there is provided a hybrid focus control method embodiment, it should be noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system such as a set of computer-executable instructions, and that while a logical order is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in an order different than here.
In the present embodiment, a hybrid focus control method is provided, which can be used in the electronic device, and fig. 1 is a flowchart of the hybrid focus control method according to the embodiment of the present invention, as shown in fig. 1, the flowchart includes the following steps:
and S11, acquiring exposure parameters and presetting tube current.
Wherein the exposure parameters include exposure power and exposure time.
The electronic device needs to obtain an exposure parameter and preset tube current when exposing, wherein the exposure parameter is used for determining a filament adopted by exposure. The filaments in the electronic device include a large filament for producing a large focus and a small filament for producing a small focus. The preset tube current is used for controlling the filament current, so that the exposure precision of the electronic equipment is realized.
And S12, when the exposure parameter is larger than the maximum exposure parameter corresponding to the small focus and smaller than the preset multiple of the maximum exposure parameter corresponding to the large focus, determining to adopt the large focus and the small focus for simultaneous exposure.
The maximum exposure parameter represents the maximum value of the exposure parameter allowed by the focus, and when the maximum exposure parameter is compared, the obtained exposure power may be compared with the exposure parameter of the focus, or the obtained exposure time may be compared with the exposure time of the focus, or a combination of the obtained exposure power and the obtained exposure time may be used, or a combination of the obtained exposure power and the obtained exposure time may be compared with a combination of the exposure power and the exposure time of the focus, and the like.
Specifically, exposure parameters corresponding to a small filament and a large filament may be stored in the electronic device, respectively, and the acquired exposure parameters may be directly compared with the exposure parameters stored in the electronic device in this step, or the like.
When the electronic device determines to expose the large and small focuses simultaneously, the large and small filaments need to be adjusted simultaneously subsequently.
And S13, dividing the preset tube current into a first preset tube current corresponding to the small focus and a second preset tube current corresponding to the large focus according to a preset proportion.
The electronic device divides the preset tube current obtained in S11 into a first preset tube current and a second preset tube current, where the first preset tube current corresponds to a small filament (i.e., a small focus), and the second preset tube current corresponds to a large filament (i.e., a large focus).
For example, a preset ratio K is set, and preset tube currents are divided according to the ratio, wherein the first preset tube current is K times the preset tube current, and the second preset tube current is (1-K) times the preset tube current.
And S14, adjusting the filament currents corresponding to the small focus and the large focus according to the first preset tube current and the second preset tube current to realize automatic exposure.
In the electronic equipment, filament current correction relation tables of corresponding relations between tube currents and filament currents are respectively stored corresponding to the small filament and the large filament, the electronic equipment can determine the filament currents corresponding to the small focus by using a first preset tube current through table look-up, and determine the filament currents corresponding to the large focus by using a second preset tube current.
After the filament current is determined, the filament current may be adjusted open loop or closed loop to achieve automatic exposure. This step will be described in detail hereinafter.
In the hybrid focus control method provided by this embodiment, when the exposure parameters satisfy the condition of simultaneous exposure of the large and small focuses, simultaneous exposure of the large and small focuses is adopted; on the basis of the acquired preset tube current, the preset tube current is divided into a first preset tube current and a second preset tube current corresponding to a small focus and a large focus by using a preset proportion, and the first preset tube current and the second preset tube current are subsequently used for realizing current carrying on the filament currents corresponding to the large focus and the small focus respectively, so that on the premise of meeting the acquired parameters, simultaneous exposure of the large focus and the small focus is realized, the use frequency of the large focus and the small focus is balanced, and the problem of early failure of the ray tube caused by unilateral reasons of the small focus is solved.
In the present embodiment, a hybrid focus control method is provided, which can be used in the electronic device, and fig. 2 is a flowchart of the hybrid focus control method according to the embodiment of the present invention, as shown in fig. 2, the flowchart includes the following steps:
and S21, acquiring exposure parameters and presetting tube current.
Wherein the exposure parameters include exposure power and exposure time.
Please refer to S11 in fig. 1, which is not described herein again.
And S22, when the exposure parameter is larger than the maximum exposure parameter corresponding to the small focus and smaller than the preset multiple of the maximum exposure parameter corresponding to the large focus, determining to adopt the large focus and the small focus for simultaneous exposure.
Please refer to S12 in fig. 1, which is not described herein again.
And S23, dividing the preset tube current into a first preset tube current corresponding to the small focus and a second preset tube current corresponding to the large focus according to a preset proportion.
Specifically, the first preset tube current and the second preset tube current may be expressed by the following formulas:
mAref1＝mAref*K；
mAref2＝mAref*(1-K)；
wherein mAref is the preset tube current, K is the preset ratio, mAref1 is the first preset tube current, and mAref2 is the second preset tube current.
And S24, adjusting the filament currents corresponding to the small focus and the large focus according to the first preset tube current and the second preset tube current to realize automatic exposure.
The electronic equipment carries out closed-loop regulation on the filament current by acquiring the feedback values of the real-time filament currents of the large and small filaments and then utilizing the preset filament currents corresponding to the electronic equipment respectively. Specifically, the method comprises the following steps:
s241, determining a first preset filament current corresponding to the first preset tube current and a second preset filament current corresponding to the second preset tube current by using the first preset tube current and the second preset tube current.
The electronic setup determines the corresponding filament current by looking up a table (i.e., tube current-filament current calibration table) in which the tube current is used to represent the correspondence between the tube current and the filament current.
Therefore, the electronic device can determine a first preset filament current corresponding to the first preset tube current and a second preset filament current corresponding to the second preset tube current by using the tube current-filament current calibration table corresponding to each filament.
S242, a first present filament current corresponding to the small focus and a second present filament current corresponding to the large focus are obtained.
The electronic equipment acquires the filament current feedback values of the small filament and the large filament in real time, specifically, the current feedback values can be acquired by the electronic equipment from an external measuring tool or can be acquired by the electronic equipment through measurement, the acquisition mode of the filament current is not limited, and the electronic equipment is only required to acquire the filament current feedback values.
S243, based on the first preset filament current, the second preset filament current, the first present filament current, and the second present filament current, performing closed-loop adjustment on the filament currents corresponding to the small focus and the large focus, respectively, to achieve automatic exposure.
When the electronic equipment performs closed-loop regulation, the first preset filament current is used as a reference value for small filament current regulation, the difference value between the first preset filament current and the first current filament current can be calculated, and then regulation is performed by combining a PID algorithm to obtain a filament current output value; similarly, the second preset filament current is used as the reference value for adjusting the current of the big lamp filament, the difference value between the second preset filament current and the second current filament current can be calculated, and then the adjustment is performed by combining with a PID algorithm, so as to obtain the filament current output value.
Alternatively, the closed-loop adjustment algorithm is not limited to the PID algorithm, and other algorithms, such as PI algorithm, etc., may be used, and the closed-loop adjustment algorithm is not limited herein.
In the hybrid focus control method provided in this embodiment, the first preset filament current and the second preset filament current can be determined by using the correspondence between the tube current and the filament current, and the filament currents of the large and small focuses are respectively adjusted in a closed loop by using the obtained current value of the filament current, so as to ensure the exposure accuracy.
As an alternative to this embodiment, the preset filament current of each filament may be compensated in combination with the tube current output by the tube in real time. As shown in fig. 3, S243 includes the following steps:
s2411, acquiring the current of the current tube.
The current tube current is the tube current output in the exposure process of the ray tube, the electronic equipment can acquire the current tube current from external measuring equipment, and a measuring device can be integrated in the electronic equipment, so that the current tube current can be measured through the electronic equipment.
And S2412, respectively calculating a first filament current compensation amount corresponding to the small focus and a second filament current compensation amount corresponding to the large focus according to a preset proportion based on the current tube current.
The electronic device divides the present tube current to obtain filament current compensation corresponding to each filament. Specifically, the first filament current compensation amount and the second filament current compensation amount are expressed by the following formulas:
δIf1＝δIf*K；
δIf2＝δIf*(1-K)；
wherein δ If1 is the first filament current compensation amount, δ If2 is the second preset filament current compensation amount; δ If is the present tube current. Here, K is the same as K in S23.
S2413, superimposing the first filament current compensation amount and the second filament current compensation amount on the corresponding first preset filament current and the second preset filament current, respectively, to obtain a first filament current setting value corresponding to the small focus and a second filament current setting value corresponding to the large focus.
Calculating the first filament current set value and the second filament current set value by adopting the following formulas:
If1＝If1_0+δIf1；
If2＝If2_0+δIf2；
wherein If1 is the first filament current setting value, If2 is the second filament current setting value, If1_0 is the first predetermined filament current, and If2_0 is the second predetermined filament current.
And S2414, respectively carrying out closed-loop regulation on the filament currents corresponding to the small focus and the large focus according to the first filament current set value, the second filament current set value, the first current filament current and the second current filament current.
Taking the small filament as an example, the first filament current setting value is used as a reference value for filament current regulation, and the filament current of the small filament is subjected to closed-loop regulation by combining the first current filament current. The filament current of the large filament is adjusted in the same manner as the filament current of the small filament.
Meanwhile, the adjustment method shown in fig. 4 may be adopted to adjust the large and small filament currents, please refer to fig. 4, the electronic device divides the obtained preset tube current into a first preset tube current and a second preset tube current according to a preset ratio, wherein the small filament current is taken as an example for detailed description. Determining a first preset filament current corresponding to the first preset tube current by searching a tube current-filament current correction table; and then obtaining the current tube current of the ray tube, and dividing the current tube current into a first current tube current and a second current tube current according to the same division mode, which can also be called as a first filament current compensation value and a second filament current compensation value. And taking the first preset filament current as a reference value of filament current compensation, and then connecting the filament current compensation value to obtain a filament current set value. And subsequently, the filament current is subjected to closed-loop regulation by using the filament current set value and the current filament current value of the small filament.
The obtained current tube current is divided into a first filament current compensation quantity and a second filament current compensation quantity according to a preset proportion, so that the filament current of the large focus and the small focus can be accurately adjusted, and the adjustment effect of the filament current is ensured.
In the present embodiment, a hybrid focus control method is provided, which can be used in the electronic device, and fig. 5 is a flowchart of the hybrid focus control method according to the embodiment of the present invention, as shown in fig. 5, the flowchart includes the following steps:
and S31, acquiring exposure parameters and presetting tube current.
Wherein the exposure parameters include exposure power and exposure time.
Please refer to S21 in fig. 2 for details, which are not described herein.
S32, calculating the product of the exposure power and the exposure time to obtain the predetermined heat amount.
And the electronic equipment calculates the product of the acquired exposure power and the exposure time to obtain a preset heat so as to determine the focus based on the preset heat subsequently.
S33, the first exposure parameter table and the second exposure parameter table are respectively searched by using the preset heat to determine whether the preset heat is larger than the first maximum exposure heat corresponding to the small focus.
The first exposure parameter table is used for representing the corresponding relation between the exposure power and the exposure time of the small focus, and the second exposure parameter table is used for representing the corresponding relation between the exposure power and the exposure time of the large focus; the first maximum exposure heat quantity is the maximum value of the product of the exposure power and the exposure time in the first exposure parameter table, and the second maximum exposure heat quantity is the maximum value of the product of the exposure power and the exposure time in the second exposure parameter table.
Optionally, a high speed parameter table and a low speed parameter table are further set in the electronic device corresponding to the big focus and the small focus, respectively, based on the anode rotation speed. Specifically, when the anode operates at a very low speed, the small focus is stored as table 1 at the maximum exposure time allowed by different exposure powers; when the small focus runs at high speed at the anode, the maximum exposure time allowed by different exposure powers is stored as table 2; when the large focus is operated at the extremely low speed of the anode, the maximum exposure time allowed by different exposure powers is stored as table 3; the maximum exposure time allowed for different exposure powers when the large focus is operated at high anode speeds is stored as table 4. When the comparison is subsequently performed, the focus is determined to be operated at a high speed or a low speed based on the exposure power, and then the table lookup is performed, so that the table lookup efficiency is improved.
When the preset heat is larger than the first maximum exposure heat, determining to adopt the small focus exposure; otherwise, S34 is executed.
And S34, judging whether the preset heat is smaller than the preset multiple of the second maximum exposure heat.
For example, the preset multiple may be 75%, or other values, and the specific values are not limited herein. Here, it is understood that it is judged whether the preset amount of heat calculated in the step S32 is less than 75% of the second maximum amount of exposure heat.
Performing S35 when the preset heat amount is less than a preset multiple of the second maximum exposure heat amount; otherwise, determining to adopt large focus exposure.
S35, determining to use the large and small focus to expose simultaneously.
And S36, dividing the preset tube current into a first preset tube current corresponding to the small focus and a second preset tube current corresponding to the large focus according to a preset proportion.
Please refer to S23 in fig. 2 for details, which are not described herein.
And S37, adjusting the filament currents corresponding to the small focus and the large focus according to the first preset tube current and the second preset tube current to realize automatic exposure.
Please refer to S24 in fig. 2 for details, which are not described herein.
According to the mixed focus control method provided by the embodiment, in the exposure process, the large focus and the small focus can work in a time-sharing mode and can also work simultaneously, so that the large focus and the small focus can be used more reasonably, and the service life of the bulb tube is further prolonged.
As a specific application example of the present embodiment, a hybrid focus control method is proposed, as follows:
1) the X-ray high voltage generator stores the maximum exposure time allowed by different focal points at different anode rotating speeds (generally divided into a high speed and a low speed) and different exposure powers. For example, when the anode is operated at extremely low speed, the maximum exposure time allowed by different exposure powers is stored as table 1; when the small focus runs at high speed at the anode, the maximum exposure time allowed by different exposure powers is stored as table 2; when the large focus is operated at the extremely low speed of the anode, the maximum exposure time allowed by different exposure powers is stored as table 3; the maximum exposure time allowed for different exposure powers when the large focus is operated at high anode speeds is stored as table 4.
2) The low focus exposure is selected when the exposure power/exposure time combination does not exceed the maximum power/exposure time combination allowed for the low focus at the corresponding anode rotation speed.
3) The large focus exposure is selected when the exposure power/exposure time combination exceeds 75% of the maximum power/exposure time combination allowed for the large focus at the corresponding anode rotation speed.
4) When the exposure power/exposure time combination exceeds the maximum power/exposure time combination allowed by the small focus at the corresponding anode rotating speed and does not exceed 75% of the maximum power/exposure time combination allowed by the large focus at the corresponding anode rotating speed, the large focus and the small focus are selected to be exposed together, namely, the large filament and the small filament of the bulb tube cathode work simultaneously and both generate electrons. Therefore, simultaneous control of the two filament currents of the cathode is required.
Among them, two lamp current control methods, as shown in fig. 3, are described in detail as follows:
1) the tube current mARef to be exposed is divided into two parts, namely mARef1 and mARef2 according to a proportionality coefficient K, and the two parts respectively correspond to a small filament and a large filament.
Wherein K is 0-1, such as 0.5.
mAref1＝mAref*K (1)
mAref2＝mAref*(1-K) (2)
2) And according to the tube current calculated in the last step and the tube voltage parameter to be exposed, respectively obtaining the filament current If1_0 required by adopting a small filament and the filament current If2_0 required by adopting a large filament through table look-up (namely a bulb tube current-filament current correction table).
3) The closed-loop regulating output quantity delta If of the tube current is calculated according to the weighting proportion K and the weighting proportions 1-K respectively and is used as compensation quantities delta If1 and delta If2 of the small and large lamp wire current during exposure. As will be shown below, in the following,
δIf1＝δIf*K (3)
δIf2＝δIf*(1-K) (4)
4) respectively superposing delta If1 and delta If2 on the initial small lamp current value If1_0 and the initial large lamp current value If2_0 to respectively obtain a final small lamp current set value If1_ ref and a final small lamp current set value If2_ ref.
5) The two filament currents are respectively controlled in a closed loop.
In this embodiment, a hybrid focus control device is further provided, and the device is used to implement the foregoing embodiments and preferred embodiments, and the description of the device already made is omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
The present embodiment provides a hybrid focus control apparatus, as shown in fig. 6, including:
an obtaining module 41, configured to obtain an exposure parameter and a preset tube current; wherein the exposure parameters include exposure power and exposure time.
And an exposure focus determining module 42, configured to determine to perform simultaneous exposure with a large focus and a small focus when the exposure parameter is greater than the maximum exposure parameter corresponding to the small focus and is less than a preset multiple of the maximum exposure parameter corresponding to the large focus.
A tube current dividing module 43, configured to divide the preset tube current into a first preset tube current corresponding to the small focus and a second preset tube current corresponding to the large focus according to a preset ratio.
And a current adjusting module 44, configured to adjust filament currents corresponding to the small focus and the large focus according to the first preset tube current and the second preset tube current to implement automatic exposure.
In the hybrid focus control device provided by this embodiment, when the exposure parameters satisfy the condition of simultaneous exposure of the large and small focuses, simultaneous exposure of the large and small focuses is adopted; on the basis of the acquired preset tube current, the preset tube current is divided into a first preset tube current and a second preset tube current corresponding to a small focus and a large focus by using a preset proportion, and the first preset tube current and the second preset tube current are subsequently used for realizing current carrying on the filament currents corresponding to the large focus and the small focus respectively, so that on the premise of meeting the acquired parameters, simultaneous exposure of the large focus and the small focus is realized, the use frequency of the large focus and the small focus is balanced, and the problem of early failure of the ray tube caused by unilateral reasons of the small focus is solved.
The hybrid focus control device in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC circuit, a processor and memory executing one or more software or fixed programs, and/or other devices that may provide the above-described functionality.
Further functional descriptions of the modules are the same as those of the corresponding embodiments, and are not repeated herein.
An embodiment of the present invention further provides an electronic device, which has the hybrid focus control apparatus shown in fig. 6.
Referring to fig. 7, fig. 7 is a schematic structural diagram of an electronic device according to an alternative embodiment of the present invention, and as shown in fig. 7, the electronic device may include: at least one processor 51, such as a CPU (Central Processing Unit), at least one communication interface 53, memory 54, at least one communication bus 52. Wherein a communication bus 52 is used to enable the connection communication between these components. The communication interface 53 may include a Display (Display) and a Keyboard (Keyboard), and the optional communication interface 53 may also include a standard wired interface and a standard wireless interface. The Memory 54 may be a high-speed RAM Memory (volatile Random Access Memory) or a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The memory 54 may alternatively be at least one memory device located remotely from the processor 51. Wherein the processor 51 may be in connection with the apparatus described in fig. 6, the memory 54 stores an application program, and the processor 51 calls the program code stored in the memory 54 for performing any of the above-mentioned method steps.
The communication bus 52 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The communication bus 52 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 7, but this is not intended to represent only one bus or type of bus.
The memory 54 may include a volatile memory (RAM), such as a random-access memory (RAM); the memory may also include a non-volatile memory (english: non-volatile memory), such as a flash memory (english: flash memory), a hard disk (english: hard disk drive, abbreviated: HDD) or a solid-state drive (english: SSD); the memory 54 may also comprise a combination of the above types of memories.
The processor 51 may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of a CPU and an NP.
The processor 51 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof.
Optionally, the memory 54 is also used to store program instructions. The processor 51 may call program instructions to implement the hybrid focus control method as shown in the embodiments of fig. 1 to 4 of the present application.
Embodiments of the present invention further provide a non-transitory computer storage medium, where computer-executable instructions are stored, and the computer-executable instructions may execute the hybrid focus control method in any of the above method embodiments. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. A hybrid focus control method, comprising:
acquiring exposure parameters and preset tube current; wherein the exposure parameters comprise exposure power and exposure time;
when the exposure parameter is larger than the maximum exposure parameter corresponding to the small focus and smaller than a preset multiple of the maximum exposure parameter corresponding to the large focus, determining to adopt the large focus and the small focus for simultaneous exposure;
dividing the preset tube current into a first preset tube current corresponding to the small focus and a second preset tube current corresponding to the large focus according to a preset proportion;
and adjusting filament currents corresponding to the small focus and the large focus according to the first preset tube current and the second preset tube current to realize automatic exposure.
2. The method of claim 1, wherein adjusting the filament currents corresponding to the small focus and the large focus to achieve auto-exposure according to the first preset tube current and the second preset tube current comprises:
determining a first preset filament current corresponding to the first preset tube current and a second preset filament current corresponding to the second preset tube current by using the first preset tube current and the second preset tube current;
acquiring a first current filament current corresponding to the small focus and a second current filament current corresponding to the large focus;
and based on the first preset filament current, the second preset filament current, the first current filament current and the second current filament current, performing closed-loop regulation on the filament currents corresponding to the small focus and the large focus respectively to realize automatic exposure.
3. The method of claim 2, wherein the closed-loop adjusting the filament currents corresponding to the small focus and the large focus based on the first preset filament current, the second preset filament current, the first present filament current, and the second present filament current, respectively, comprises:
acquiring current tube current;
respectively calculating a first filament current compensation quantity corresponding to the small focus and a second filament current compensation quantity corresponding to the large focus according to the preset proportion on the basis of the current tube current;
superposing the first filament current compensation quantity and the second filament current compensation quantity on the corresponding first preset filament current and the second preset filament current respectively to obtain a first filament current set value corresponding to the small focus and a second filament current set value corresponding to the large focus;
and performing closed-loop regulation on the filament currents corresponding to the small focus and the large focus respectively according to the first filament current set value, the second filament current set value, the first current filament current and the second current filament current.
4. The method of claim 3, wherein the first predetermined tube current and the second predetermined tube current are represented by the following equations:
mAref1＝mAref*K；
mAref2＝mAref*(1-K)；
wherein mAref is the preset tube current, K is the preset ratio, mAref1 is the first preset tube current, and mAref2 is the second preset tube current.
5. The method of claim 4, wherein the first filament current set point and the second filament current set point are represented by the following equations:
If1＝If1_0+δIf1,δIf1＝δIf*K；
If2＝If2_0+δIf2,δIf2＝δIf*(1-K)；
wherein If1 is the first filament current setting value, If2 is the second filament current setting value, If1_0 is the first preset filament current, If2_0 is the second preset filament current, δ If1 is the first filament current compensation amount, and δ If2 is the second preset filament current compensation amount; δ If is the present tube current.
6. The method of claim 1, wherein the step of determining simultaneous exposure with large and small foci when the exposure parameter exceeds the maximum exposure parameter corresponding to small foci and is less than a preset multiple of the maximum exposure parameter corresponding to large foci is preceded by the step of:
calculating the product of the exposure power and the exposure time to obtain a preset heat quantity;
respectively searching a first exposure parameter table and a second exposure parameter table by using the preset heat to judge whether the preset heat is larger than a first maximum exposure heat corresponding to a small focus or not; the first exposure parameter table is used for representing the corresponding relation between the exposure power and the exposure time of the small focus, and the second exposure parameter table is used for representing the corresponding relation between the exposure power and the exposure time of the large focus; the first maximum exposure heat quantity is the maximum value of the product of the exposure power and the exposure time in the first exposure parameter table;
when the preset heat is larger than the first maximum exposure heat, judging whether the preset heat is smaller than a preset multiple of a second maximum exposure heat; wherein the second maximum exposure heat is a maximum value of a product of the exposure power and the exposure time in the second exposure parameter table.
7. The method of claim 6, further comprising:
when the preset heat is less than or equal to the first maximum exposure heat, determining to adopt the small focus exposure;
and when the preset heat is greater than or equal to the preset multiple of the second maximum exposure heat, determining to adopt large-focus exposure.
8. A hybrid focus control apparatus, comprising:
the acquisition module is used for acquiring exposure parameters and preset tube current; wherein the exposure parameters comprise exposure power and exposure time;
the exposure focus determining module is used for determining simultaneous exposure by adopting large and small focuses when the exposure parameters are larger than the maximum exposure parameters corresponding to the small focuses and smaller than the preset multiple of the maximum exposure parameters corresponding to the large focuses;
the tube current dividing module is used for dividing the preset tube current into a first preset tube current corresponding to the small focus and a second preset tube current corresponding to the large focus according to a preset proportion;
and the current adjusting module is used for adjusting filament currents corresponding to the small focus and the large focus according to the first preset tube current and the second preset tube current so as to realize automatic exposure.
9. An electronic device, comprising:
a memory and a processor, the memory and the processor being communicatively connected to each other, the memory having stored therein computer instructions, the processor executing the computer instructions to perform the hybrid focus control method of any of claims 1-7.
10. A computer-readable storage medium storing computer instructions for causing a computer to perform the hybrid focus control method of any one of claims 1-7.
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