CN111712010B - LED light control system and use method thereof - Google Patents
LED light control system and use method thereof Download PDFInfo
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- CN111712010B CN111712010B CN202010567641.0A CN202010567641A CN111712010B CN 111712010 B CN111712010 B CN 111712010B CN 202010567641 A CN202010567641 A CN 202010567641A CN 111712010 B CN111712010 B CN 111712010B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The invention discloses an LED light control system, comprising: the controller, the photometric probe, the display and the light display gray scale bar; the photometric probe is electrically connected with the controller; the photometric probe is used for detecting the brightness information of the negative film to be imaged and transmitting the brightness information to the controller; the display is electrically connected with the controller; the display is used for displaying the exposure time transmitted by the controller; the light display gray scale bar is electrically connected with the controller; and the light display gray scale bar is used for displaying gray scales corresponding to the exposure time according to the triggering of the controller. According to the invention, repeated attempts on the photosensitive photographic paper are not required to be carried out in a manual mode, so that the efficiency of determining the exposure time is improved, the waste of the photosensitive photographic paper is avoided, and meanwhile, the gray scale corresponding to the imaging of the negative film to be imaged is avoided, so that the user can conveniently carry out later-stage adjustment and other operations, and the improvement of user experience is facilitated.
Description
Technical Field
The invention belongs to the technical field of photography, and particularly relates to an LED light control system and a using method thereof.
Background
In the process of imaging through the negative, the negative on the enlarger is projected to the photosensitive photographic paper below the lens through the lens by the light source so as to image on the photosensitive photographic paper.
In order to make the image on the negative clearly and beautifully appear on the photosensitive photographic paper, proper exposure time needs to be set. When the exposure time is adjusted, different exposure times are generally set firstly, then exposure and flushing are carried out on the set exposure times one by one to obtain images corresponding to the different exposure times, and then the ideal exposure time is determined according to the definition and the attractiveness of each image.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
in the process of adjusting the exposure time, multiple attempts are needed, the operation is complicated, and a large amount of manpower is wasted. Moreover, the image on the negative film is displayed on the photosensitive photographic paper in the process of adjusting the exposure time, which causes the waste of the photosensitive photographic paper
Disclosure of Invention
The invention aims to: in order to solve the technical problem in reality, an LED light control system and a using method thereof are provided.
The technical scheme adopted by the invention is as follows:
an LED light control system comprising: the controller, the photometric probe, the display and the light display gray scale bar; wherein the content of the first and second substances,
the photometric probe is electrically connected with the controller; the photometric probe is used for detecting the brightness information of the negative film to be imaged and transmitting the brightness information to the controller;
the display is electrically connected with the controller; the display is used for displaying the exposure time transmitted by the controller;
the light display gray scale bar is electrically connected with the controller; and the light display gray scale bar is used for displaying gray scales corresponding to the exposure time according to the triggering of the controller.
Wherein, further include: an LED light source; wherein the content of the first and second substances,
the LED light source is electrically connected with the controller;
the controller includes: the control chip and the pulse width modulation PWM circuit; wherein, the first and the second end of the pipe are connected with each other,
the control chip is connected with the PWM circuit;
the LED light source is electrically connected with the PWM circuit;
the light display gray scale bar is connected with the control chip;
the display and the light display gray scale bar are integrated into a whole.
Wherein, photometry probe includes: the device comprises a photosensitive chip and a signal amplification circuit; wherein the content of the first and second substances,
the photosensitive chip is connected with the signal amplifying circuit;
the signal amplification circuit is connected with the controller.
Wherein, include:
detecting brightness information in a negative film to be imaged by using a photometric probe, and transmitting the brightness information to a controller;
determining an exposure time by the controller according to the brightness information;
displaying the exposure time by using a display;
and displaying the gray scale corresponding to the exposure time by using the light display gray scale bar.
Wherein the luminance information includes: the brightness values corresponding to at least two positions in the negative film to be imaged respectively;
the determining, by the controller, an exposure time according to the brightness information includes:
determining, by the controller, a minimum brightness value among the brightness values from the brightness information;
and calculating the exposure time according to the minimum brightness value and the exposure compensation constant of the photosensitive photographic paper to be imaged.
Wherein, according to the minimum brightness value and the exposure compensation constant of the photosensitive photographic paper to be imaged, calculating the exposure time comprises:
calculating the exposure time using a first calculation formula:
wherein T represents the exposure time, L mix Characterizing said minimum brightness value, E x Characterizing the exposure compensation constant.
Wherein after said determining with said controller an exposure time from said brightness information, further comprising:
receiving an exposure time changing instruction input from the outside, wherein the changing instruction carries the gray scale to be changed;
determining the time length to be adjusted according to the gray scale to be changed and the unit time length corresponding to the unit gray scale;
and changing the exposure time according to the time length to be adjusted.
Wherein the light display gray scale bar includes: each gray scale display area corresponds to one gray scale, and different gray scale display areas correspond to different gray scales;
the displaying gray scales corresponding to the exposure time by using the light display gray scale bar includes:
detecting a current brightness value corresponding to the current position in the negative film to be imaged by using the photometric probe;
and determining the gray scale corresponding to the current position by using the controller according to the current brightness value and the minimum brightness value, and triggering the gray scale display area corresponding to the gray scale in the gray scale bar of the light display.
Wherein the determining, by the controller, the gray level corresponding to the current position according to the current brightness value and the minimum brightness value includes:
calculating the gray scale using a second calculation formula:
wherein K represents the gray scale, H represents the current brightness, L mix And characterizing the minimum brightness value and the contrast constant of the photosensitive photographic paper to be imaged.
Wherein, further include:
receiving, with the controller, a contrast change instruction;
adjusting the duty ratio of blue light and green light emitted by an LED light source according to the contrast change instruction to adjust the gray scale corresponding to the current position and trigger the gray scale display area corresponding to the adjusted gray scale in the light display gray scale bar;
and exposing the negative film to be imaged according to the exposure time and the adjusted duty ratio so as to form an image corresponding to the adjusted gray scale on the photosensitive photographic paper to be imaged.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. in the invention, the photometric probe is electrically connected with the controller, after the photometric probe is used for detecting the brightness information in the negative film to be imaged, the brightness information can be transmitted to the controller, the controller can determine the proper exposure time according to the brightness information, and because the controller is electrically connected with the display, after the controller determines the exposure time, the display can be used for displaying the exposure time, a user can directly check the exposure time from the display without adopting a manual mode to carry out multiple attempts on the photosensitive photographic paper, thereby not only improving the efficiency of determining the exposure time, but also avoiding the waste of the photosensitive photographic paper.
2. In the invention, after the controller calculates the gray scale corresponding to the exposure time, the light display gray scale bar can be triggered to display the gray scale, so that a user can visually check the gray scale corresponding to the imaging of the negative film to be imaged under the exposure time, the user can conveniently perform operations such as later adjustment and the like, and the improvement of user experience is facilitated.
Drawings
The drawings are included to provide a better understanding of the invention and are not to be construed as unduly limiting the invention. Wherein:
fig. 1 is a schematic structural diagram of an LED light control system according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a method for using an LED light control system according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a light measuring probe in an LED light control system according to an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a display in an LED light control system according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a power management module in an LED lighting control system according to an embodiment of the present invention;
FIG. 6 is a schematic circuit diagram of an indicator light in an LED light control system according to an embodiment of the present invention;
FIG. 7 is a schematic circuit diagram of an optical display gray scale bar in an LED light control system according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a PWM circuit in an LED light control system according to an embodiment of the present invention.
The mark in the figure is: 101. a controller; 1011. a control chip; 1012. a PWM circuit; 102. a light measuring probe; 1021. a photosensitive chip; 1022. a signal amplification circuit; 103. a display; 104. an LED light source; 105. the light shows gray scale bars.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
First embodiment, referring to fig. 1 to 8, an embodiment of the present invention provides an LED light control system 100, including: a controller 101, a photometric probe 102, and a display 103; wherein, the photometric probe 102 is electrically connected to the controller 101; the display 103 is electrically connected to the controller 101.
Because of the electrical connection between the metering probe 102 and the controller 101, after the brightness information in the negative film to be imaged is detected by the metering probe 102, the brightness information can be transmitted to the controller 101, and then the controller 101 can determine the proper exposure time according to the brightness information, and because of the electrical connection between the controller 101 and the display 103, after the exposure time is determined by the controller 101, the exposure time can be displayed by the display 103. The user can view the exposure time directly from the display 103 without having to manually make multiple attempts at the photosensitive photographic paper, which not only improves the efficiency of determining the exposure time, but also avoids the waste of the photosensitive photographic paper.
Furthermore, after the controller calculates the gray scale corresponding to the exposure time, the controller can trigger the light display gray scale bar to display the gray scale, so that the user can visually check the gray scale corresponding to the imaging of the negative film to be imaged under the exposure time, the user can conveniently perform post-adjustment and other operations, and the improvement of user experience is facilitated.
That is to say, as shown in fig. 2, the method for using the LED light control system 100 according to the embodiment of the present invention may include the following steps S201 to S204:
step S201: the luminance information in the negative film to be imaged is detected by the photometry probe 102 and transmitted to the controller 101.
The photometry probe 102 can detect brightness values corresponding to a plurality of positions in the negative film to be imaged, and the detected brightness values are different because the brightness values at the positions in the negative film to be imaged are different.
Specifically, as shown in fig. 3, the photometry probe 102 may include: a photosensitive chip 1021 and a signal amplification circuit 1022; the photosensitive chip 1021 is connected with the signal amplifying circuit 1022; the signal amplifying circuit 1022 is connected to the controller 101.
The photosensitive chip 1021 can obtain brightness values of different positions on the negative film to be imaged, for example, the photosensitive chip 1021 can obtain pulse signals with different intensities corresponding to the positions with different brightness in the negative film to be imaged. Since the pulse signal acquired by the photosensitive chip 1021 may be weak, the pulse signal acquired by the photosensitive chip 1021 is amplified by the signal amplifying circuit 1022 and then transmitted to the controller 101. In the signal amplifying circuit 1022, two transistors (Q1 and Q2 in fig. 3) are included in parallel, and each transistor is connected to an external power supply, the light sensing chip 1021, and the controller 101. In the signal amplifying circuit, the current and/or voltage is enhanced mainly by the transistors (Q1 and Q2 in fig. 2) to enhance the pulse signal. Therefore, the signals collected by the photosensitive chip 1021 are amplified by the signal amplifying circuit 1022 and then transmitted to the controller 101, so that the controller 101 can process the brightness information conveniently, and the efficiency and the accuracy of determining the exposure time can be improved.
In addition, the display in the LED lighting control system 100 may be an Organic Light-Emitting Diode (OLED) display, and a circuit schematic diagram of the OLED display may be as shown in fig. 4, and the determined exposure time may be clearly displayed by using the OLED display.
Further, the photometric probe 102 further includes a power management module, a schematic circuit diagram of which is shown in fig. 5, and the power management module can provide a stable voltage for the photosensitive chip 1021 to ensure the normal operation of the photosensitive chip 1021. In addition, the light measuring probe 102 is further provided with an indicator light, a circuit schematic diagram of the indicator light is shown in fig. 6, the indicator light is mainly connected with a diode and a resistor, one end of the diode is connected with the photosensitive chip 1021, and when the light measuring probe 102 detects brightness information of a negative film to be imaged, the indicator light is turned on to prompt a user that the light measuring probe 102 is in a normal working state.
Step S202: the controller 101 is used to determine the exposure time based on the brightness information.
After the light measuring probe 102 sends the detected plurality of brightness values to the controller 101, the controller 101 may be used to determine a minimum brightness value of the brightness values from the brightness information (i.e., the plurality of brightness values), and then the exposure time may be calculated according to the determined minimum brightness value and the exposure compensation constant of the photosensitive photographic paper to be imaged by using the following calculation formula.
Wherein T represents the exposure time, L mix Characterizing said minimum brightness value, E x Characterizing the exposure compensation constant.
In the traditional exposure time adjusting process, a plurality of different exposure times are set firstly, and then the process of developing one by one is carried out according to the set exposure time, namely, the proper exposure time is determined, and the exposure time can enable the area with the highest brightness in the negative film to be imaged clearly. In this embodiment, the controller determines a minimum brightness value from the plurality of brightness values, the minimum brightness value corresponding to the highest brightness region of the negative film to be imaged. In addition, in the process of calculating the exposure time, the exposure compensation constant of the photosensitive photographic paper to be imaged is combined, so that the adjustment efficiency of the exposure time is improved, and the imaging definition is improved. It can be understood that the exposure compensation constant of the photosensitive photographic paper to be imaged is the set attribute of the photosensitive photographic paper, and the exposure compensation constants of different photosensitive photographic papers are different.
In addition, it can be understood that the detection position of the light measuring probe 102 can be manually controlled, that is, when the user uses the LED light control system 100 provided in the embodiment of the present invention, in order to further improve the adjustment efficiency of the exposure time, the light measuring probe 102 may be used to detect the bright area in the negative to be imaged first, so that the obtained brightness value is smaller, thereby facilitating the controller to determine the minimum brightness value quickly.
Step S203: the exposure time is displayed by means of the display 103.
Step S204: the gray corresponding to the exposure time is displayed using the light display gray scale bar 105.
In the prior art, a halogen bulb or an incandescent bulb is generally adopted as the light source of the enlarger, and for photosensitive photographic paper which is only sensitive to blue light and green light, only a small part of light in the light-emitting color spectrum of the halogen bulb or the incandescent bulb is utilized, so that the light-emitting efficiency of the light source of the prior enlarger is low, and the required exposure time is long. However, the long exposure time causes a large amount of heat generated from the light source, which is likely to damage the film. Moreover, a heat sink (such as a fan) is often added to dissipate heat, and the vibration of the heat sink may cause the focus of the lens to shift, resulting in unclear image on the negative film.
In order to solve the above problem, the LED light control system 100 according to an embodiment of the present invention further includes: LED light sources 104 and light display gray scale bars 105; wherein the LED light source 104 is electrically connected to the controller 101; the light display gray scale bar 105 is electrically connected with the controller 101.
In this embodiment, the LED light source 104 may be an LED light source composed of blue light and green light, and the LED light source 104 is used to replace a conventional halogen bulb or incandescent bulb, thereby reducing heat generation, avoiding damage to the negative film due to excessive heat, and eliminating an active heat sink, thereby avoiding the problem of unclear imaging due to vibration of the heat sink.
In addition, through the electrical connection between the LED light source 104 and the controller 101, the controller 101 can adjust the ratio of the blue light and the green light emitted by the LED light source 104, so as to adjust the contrast value during the exposure process, thereby adjusting the gray scale of the image. Then, the adjusted gray scale is displayed by the light display gray scale bar 105 electrically connected with the controller 101, so that the user can visually check the adjusted gray scale through the light display gray scale bar 105, thereby facilitating the user to further adjust the gray scale value.
For example, when the LED gray scale bar includes 15 LED indicator lamps, each LED indicator lamp corresponds to one level of gray scale, that is, the LED gray scale bar is composed of 15 levels of LED gray scale display regions, and a circuit diagram thereof is shown in fig. 7. The 15-level gray scale display area is divided into 3 modules, each module corresponds to the 5-level gray scale display area, each gray scale display area corresponds to one gray scale, and each gray scale display area corresponds to different gray scales. In order to facilitate the contrast of the gray scales for the user, the gray scales corresponding to the 15-level gray scale display regions sequentially increase or decrease, for example, when the 15-level gray scale display regions are sequentially arranged from left to right, the gray scale corresponding to the leftmost first-level gray scale display region is the minimum value or the maximum value.
Taking the gray scale corresponding to the first-level gray scale display area as the minimum value as an example, after the controller 101 determines the proper exposure time according to the brightness information, not only the corresponding exposure time is displayed on the display 103, but also the light display gray scale bar 105 is lighted up. At this time, the light display gray scale bar 105 displays according to the calculated exposure time and the default contrast value, generally, the first-level gray scale display area in the light display gray scale bar 105 is lighted up, that is, when the exposure time is calculated, because the minimum brightness value in the negative film to be imaged is adopted, the minimum gray scale value is displayed through the light display gray scale bar 105.
Of course, the user can also visually check the shades of the gray scales corresponding to other positions in the film to be imaged through the bright light to display the gray scale bar 105. At this time, the light measuring probe 102 is only needed to detect the brightness values of other positions in the negative film to be imaged. Specifically, the position detected by the light measuring probe 102 is used as the current position, that is, the light measuring probe 102 can be used to detect the current brightness value corresponding to the current position in the negative to be imaged, then the controller 101 can calculate the gray scale corresponding to the current position by using the following calculation formula according to the detected current brightness value and the previously determined minimum brightness value, and then the controller 101 triggers the gray scale display area corresponding to the gray scale in the light display gray scale bar 105.
Wherein K represents the gray scale, H represents the current brightness, L mix Characterizing the minimum brightness value, ISO (R) characterizing a contrast constant of the photographic paper to be imaged.
Since the controller 101 uses the minimum brightness value of the brightness values when calculating the exposure time, the current brightness value corresponding to the current position is greater than the minimum brightness value, that is, the current position is darker than the position corresponding to the minimum brightness value. That is to say, in the using method of the LED light control system 100 according to the embodiment of the present invention, the light measuring probe 102 may be used to detect the minimum brightness value of the brightness area in the film to be imaged, and calculate the exposure time according to the detected minimum brightness value, at this time, not only the display 103 displays the exposure time, but also the first-level gray scale display area on the gray scale bar 105 is displayed to light up, which represents the gray scale corresponding to the brightness area when the brightness area is exposed with the calculated exposure time. Then, the light measuring probe 102 can be used to continuously detect the current brightness value of the dark area (current position) in the negative to be imaged, and the controller 101 can calculate the corresponding gray scale when the dark area is exposed for the exposure time according to the above calculation formula, and trigger the light to display the gray scale bar 105 and the gray scale display area corresponding to the gray scale to light up.
The user can visually check the gray scale corresponding to each position in the negative film to be imaged through the lightened gray scale display area, and can adjust the gray scale by changing the contrast value. When performing a grey scale adjustment, a user may modify the default contrast value by inputting a contrast modification instruction to the controller 101. The process of adjusting the gray scale by the controller 101 according to the contrast change instruction is mainly to adjust the duty ratio of blue-green light emitted by the LED light source 104, that is, the gray scale corresponding to the current position is adjusted by changing the ratio of blue light and green light emitted by the blue light source 104, and the adjusted gray scale is visually displayed on the light display gray scale bar 105, that is, the adjustment process visually represents that different gray scale display areas of the light display gray scale bar 105 are lighted.
To enable adjustment of the duty cycle of the LED light source 104, in one embodiment of the invention, the controller 101 comprises: a control chip 1011 and a pulse width modulation PWM circuit 1012; the control chip 1011 is connected to the PWM circuit 1012; the LED light source 104 is electrically connected to the PWM circuit 1012; the light display gray scale bar 105 is connected with the control chip 1011.
Fig. 8 shows a circuit diagram of the connection of the LED light source 104 and the PWM circuit 1012, wherein the LED light source 104 is connected to two filter chips (CLK1 and CLK2), the duty ratio of green light emitted by the LED light source 104 is adjusted by CLK1, the duty ratio of blue light emitted by the LED light source 104 is adjusted by CLK2, the filter chip CLK1 is connected to the control chip 1011 through a PB4 interface, and the filter chip CLK2 is connected to the control chip 1011 through a PH6 interface. Specifically, the PWM circuit 1012 may change the pulse light-emitting on-time of the LED light source 104 according to the contrast value carried in the contrast modification command transmitted by the control chip 1011, so as to change the light-emitting ratio of the blue light and the green light emitted by the LED light source 104, thereby adjusting the duty ratio of the blue-green light. It will be appreciated that, at this time, the blue light source is continuously turned on and off for a certain period of time (related to the contrast value), and the user visually sees the effect of continuous lighting due to its high frequency of change. Then, the control chip 1011 determines the corresponding gray scale display area on the light display gray scale bar 105 according to the adjusted duty ratio of the blue-green light, controls the gray scale display area to light up, and simultaneously turns off the lit gray scale display area before the contrast adjustment, so that a user can visually check the contrast adjustment result through the light display gray scale bar 105. For example, before contrast adjustment, the light displayed on the gray-scale bar 105 is the first-level gray-scale display area, after contrast adjustment, the first-level gray-scale display area is turned off, and the fourth-level gray-scale display area is turned on, so that the user can visually check the shade of the gray scale according to the turned-on gray-scale display area.
In addition, in order to further facilitate the user to view and operate the device, the display 103 and the light display gray scale bar 105 provided by the embodiment of the invention can be integrated into a whole. For example, the display 103 and the light display gray scale bars 105 may be integrated on a cuboid device, wherein the display 103 is located on one side of the cuboid device and the light display gray scale bars 105 are located on the opposite side of the display 103, or the light display gray scale bars 105 are located on the other three sides of the cuboid device, each side corresponding to a 5-level gray scale display area.
It is worth mentioning that the user may also adjust the gray scale by inputting an exposure time change instruction to the controller 101. Unlike the prior art in which multiple exposure times are set randomly, in the embodiment of the present invention, the exposure time can be changed by the user by changing the gray scale. Specifically, the user inputs an exposure time modification instruction to the controller 101, where the modification instruction carries a gray level to be modified, and the gray level to be modified represents the number of gray level levels to be adjusted, for example, if the gray level to be modified is 2, it indicates that the existing gray level value is increased by 2 levels. Since the gray value progression is related to the optical density, that is, each level of gray value corresponds to 0.15 optical density, and each 0.15 optical density corresponds to one exposure unit time length, for example, one exposure unit time length is 21/2ms, when the gray value to be modified carried in the modification instruction input by the user is 2, the time length to be adjusted is 2 × 21/2ms, and then the exposure time can be modified according to the determined time length to be adjusted. In the embodiment, the exposure time is changed by changing the gray scale, that is, the exposure time is changed according to the unit time length corresponding to the exposure time, which is beneficial to improving the efficiency of adjusting the exposure time compared with the prior art that a plurality of exposure times are randomly set and then a proper exposure time is selected from the set exposure times. This is because, in a plurality of exposure times set randomly, if there may be two or more exposure times that are relatively close, the corresponding gray scales are not changed much, for example, when the difference between the two exposure times is less than 21/2ms, the gray scales corresponding to the two exposure times are likely to be the same level, so that the process of performing the development respectively according to the two exposure times and selecting the appropriate exposure time from the images obtained by the development is practically no different from the result of randomly selecting one from the two exposure times. That is, in the prior art, the process of selecting a proper exposure time from a plurality of randomly set exposure times may have a plurality of indiscriminate developing results, which not only makes the operation thereof more complicated, but also reduces the adjustment efficiency of the exposure time. In the embodiment of the invention, the time length to be adjusted corresponding to the exposure time is reversely deduced according to the number of the gray levels to be changed, so that the condition that the corresponding gray levels are not changed after the exposure time is adjusted is avoided, and the efficiency of adjusting the exposure time is improved.
It can be understood that, in the process of changing the exposure time according to the change instruction, the gray scale corresponding to the changed exposure time will change, and the gray scale display area lit on the light display gray scale bar 105 also changes, so that the user can visually check the change result of the exposure time, and the user can conveniently adjust the exposure time.
After the user determines the proper exposure time and contrast value (corresponding to the duty ratio of the blue light and the green light emitted by the LED light source 104), the photosensitive film to be imaged can be exposed according to the determined exposure time and contrast value, so as to form a clear image with proper gray scale on the photosensitive photographic paper to be imaged. Therefore, after the proper exposure time and contrast value are determined, the image in the photosensitive negative film is imaged on the photosensitive photographic paper, and the adjustment process of the exposure time and the contrast value is visually displayed by the light display gray scale bars 105, so that the photosensitive photographic paper is not wasted in the adjustment process of the exposure time and the contrast value.
According to the technical scheme of the embodiment of the invention, according to the electric connection between the photometric probe and the controller, after the photometric probe is used for detecting the brightness information in the negative film to be imaged, the brightness information can be transmitted to the controller, the controller can determine the proper exposure time according to the brightness information, and because the controller is electrically connected with the display, after the controller determines the exposure time, the display can be used for displaying the exposure time. The user can directly view the exposure time from the display without manually trying the photosensitive photographic paper for many times, which not only improves the efficiency of determining the exposure time, but also avoids the waste of the photosensitive photographic paper. And after the controller calculates the gray scale corresponding to the exposure time, the controller can trigger the light display gray scale bar to display the gray scale so that the user can visually check the gray scale corresponding to the imaging of the negative film to be imaged under the exposure time, thereby facilitating the user to carry out operations such as later adjustment and the like and being beneficial to improving the user experience.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (1)
1. An LED light control system, comprising: the system comprises a controller (101), a photometric probe (102), a display (103) and light display gray-scale bars (105); wherein, the first and the second end of the pipe are connected with each other,
the photometric probe (102) is electrically connected with the controller (101); the photometry probe (102) is used for detecting the brightness information of a negative film to be imaged and transmitting the brightness information to the controller (101);
the display (103) is electrically connected with the controller (101);
the light display gray scale bar (105) is electrically connected with the controller (101); the light display gray scale bar (105) is used for displaying gray scales corresponding to exposure time according to the triggering of the controller (101);
the photometric probe (102) comprises: a photosensitive chip (1021) and a signal amplification circuit (1022); wherein the content of the first and second substances,
the photosensitive chip (1021) is connected with the signal amplifying circuit (1022);
the signal amplification circuit (1022) is connected with the controller (101);
further comprising: an LED light source (104); wherein the LED light source (104) is electrically connected with the controller (101);
the controller (101) comprises: a control chip (1011) and a Pulse Width Modulation (PWM) circuit (1012); wherein, the first and the second end of the pipe are connected with each other,
the control chip (1011) is connected with the PWM circuit (1012);
the LED light source (104) is electrically connected with the PWM circuit (1012);
the light display gray scale bar (105) is connected with the control chip (1011);
the display (103) is integrated with the light display gray scale bar (105);
detecting brightness information in a negative film to be imaged by using the photometric probe (102), and transmitting the brightness information to the controller (101);
determining an exposure time by means of the controller (101) from the brightness information;
displaying the exposure time by using a display (103);
displaying gray scales corresponding to the exposure time by using a light display gray scale bar (105);
the luminance information includes: the brightness values corresponding to at least two positions in the negative film to be imaged are as follows:
determining, with the controller (101), an exposure time based on the brightness information, comprising:
determining, with the controller (101), a minimum brightness value among the brightness values from the brightness information;
calculating exposure time according to the minimum brightness value and an exposure compensation constant of the photosensitive photographic paper to be imaged;
calculating exposure time according to the minimum brightness value and an exposure compensation constant of the photosensitive photographic paper to be imaged, wherein the calculation comprises the following steps:
the exposure time is calculated using the following first calculation formula:
wherein T represents the exposure time, L mix Characterizing said minimum brightness value, E x Characterizing the exposure compensation constant;
after determining an exposure time from the brightness information with the controller (101), further comprising:
receiving an exposure time changing instruction input from the outside, wherein the changing instruction carries the gray scale to be changed;
determining the time length to be adjusted according to the gray scale to be changed and the unit time length corresponding to the unit gray scale;
changing the exposure time according to the time length to be adjusted;
the light display gray scale bar (105) comprises: each gray scale display area corresponds to one gray scale, and different gray scale display areas correspond to different gray scales;
the displaying gray scale corresponding to exposure time by using light display gray scale bar (105) comprises:
detecting a current brightness value corresponding to a current position in the negative film to be imaged by using the photometric probe (102);
determining the gray scale corresponding to the current position according to the current brightness value and the minimum brightness value by using the controller (101), and triggering the gray scale display area corresponding to the gray scale in the light display gray scale bar (105);
the determining, by the controller (101), the gray level corresponding to the current position according to the current brightness value and the minimum brightness value includes:
calculating the gray scale using a second calculation formula:
wherein K represents the gray scale, H represents the current brightness, L mix Characterizing the minimum brightness value, ISO (R) characterizing a contrast constant of the photographic paper to be imaged;
further comprising:
receiving a contrast modification instruction with the controller (101);
adjusting duty ratios of blue light and green light emitted by an LED light source (104) according to the contrast change instruction to adjust the gray scale corresponding to the current position and trigger the gray scale display area corresponding to the adjusted gray scale in the light display gray scale bar (105);
and exposing the negative film to be imaged according to the exposure time and the adjusted duty ratio so as to form an image corresponding to the adjusted gray scale on the photosensitive photographic paper to be imaged.
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| CN2256108Y (en) * | 1995-11-22 | 1997-06-11 | 徐润德 | Special exposure controller for black and white amplification |
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