CN117784857A - White tea leaf withering method for simulating sunlight - Google Patents
White tea leaf withering method for simulating sunlight Download PDFInfo
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Abstract
The invention relates to the field of information processing, and discloses a white tea leaf withering method for simulating sunlight, which comprises the following steps: according to the withering stage that regional tealeaves image was withered to the area of withering obtained white tea, confirm environmental parameter adjustment value according to the withering stage, wherein, environmental parameter includes temperature, humidity, carbon dioxide concentration and oxygen concentration, and regional illumination and humidity are withered according to environmental parameter adjustment value adjustment, can ensure through this application that tealeaves carries out suitable withering, avoid withering the broken and influence tealeaves grade of tealeaves that appear in-process.
Description
Technical Field
The invention relates to the field of information processing, in particular to a white tea leaf withering method for simulating sunlight.
Background
White tea is one of six big teas, is a special tea in China, and has the theory of 'one year tea, three years medicine and seven years treasure'. White tea has a unique stir-frying and kneading-free process, so the market share in recent years is improved year by year, and is favored. The tea tree variety is suitable for planting white tea in unique climate and topography in Guizhou province, and provides good conditions for processing. The main process for producing white tea is withering and drying. The quality of the white tea is influenced by multiple factor coupling, and each link has important influence on the quality of the white tea from raw materials, processing to environment, but in the whole manufacturing process of the process white tea, withering is a key process for determining the quality of the white tea, and the special aroma and taste of the white tea can be formed. The excellent quality of white tea requires that fresh tea leaves contain high levels of fluff and amino acids. Through withering, tea buds naturally change slowly, active enzymes and polyphenol substances in tea are reserved to the greatest extent, and the method plays a decisive role in forming quality characteristics of the process white tea. The withering temperature determines the evaporation of the leaf moisture, the decomposition of the organic material and the oxidation of the polyphenols, preferably not exceeding 32 ℃. Air circulation plays a vital role in withering, it accelerates moisture evaporation, prevents carbon dioxide and ammonia from accumulating to cause toxicity, and supplies oxygen. At the same time, the complete destruction of chlorophyll by withering is prevented, and the extent of withering needs to be controlled. Withering mode, time and ambient temperature and humidity and air circulation are important factors affecting tea quality.
The white tea withering process comprises natural withering, heating withering, duplex withering and LED lamp withering. The traditional production is mainly based on natural sunlight withering, the sunlight withering has the characteristics of simple equipment, low cost, prominent tea flavor and the like, and can form stable white tea quality, but a large processing area is needed, and the white tea is easily affected by seasons and climates, especially fresh tea moisture cannot be quickly evaporated in overcast and rainy weather, so that tea green deterioration is caused, the product is dark in color, not fresh in fragrance, dark yellow in soup color, unstable in product quality and not suitable for large-scale production of tea. At present, in actual production, sunlight withering is generally combined with indoor natural withering, sunlight withering and indoor natural withering are repeatedly alternated, fresh She Jianxie ground receives sunlight withering and indoor withering, namely duplex withering, but traditional duplex withering requires a large amount of labor force, repeated carrying is continuously carried out, the strength of sunlight, the length of airing time and the front and back receiving and spreading are incorrect, the quality of white tea is greatly influenced, especially the quality of white tea is suddenly exposed to wind and rain, and the loss is larger. The heating withering can shorten the withering time through temperature and humidity control, and solves the problem that natural withering cannot be produced on a large scale due to factors such as climate and the like. The traditional withering mode has the defects that the quality of products and batches is not stable enough, the quality and the safety and sanitation of white tea cannot reach ideal effects, and the withering quality of the white tea in different process levels is greatly different. Therefore, to improve the quality of the processed white tea, the existing problems are solved from the withering process.
White tea is the simplest production process, where withering is critical, and the withering gradually converts the properties of tea leaves into micro-fermented tea. Fat-soluble pigments are the main factor affecting the color of dry tea. During the withering process of white tea, some fat-soluble pigments, especially chlorophyll, undergo a series of changes, and finally the basic color of white tea is formed. In the early stage of withering, the leaves lose water, the concentration of cell fluid increases, and chlorophyll is decomposed under the action of enzymes. In the middle and late stages of wilting, the ratio of chlorophyll a to chlorophyll B changes due to quinone degradation. Chlorophyll a has a lower stability than chlorophyll B. As the leaves wither, the ratio of chlorophyll a to chlorophyll B gradually decreases, and the color of the leaves gradually changes from dark green to light green.
In the withering process, leaf temperature changes, the leaves lose water, the acidity of cell sap increases, chlorophyll is demineralized, and the leaf color becomes dark gradually. Carotenoids condense with polyphenol oxides to form colored materials. Therefore, the colors of yellow, green, red and the like form the characteristics of white tea which takes green as a main color tone and slightly takes yellow and red dry tea. The white tea takes the white tea as a background and has the characteristics of grayish green and silvery luster.
Disclosure of Invention
The invention aims to overcome one or more of the prior technical problems and provide a white tea leaf withering method for simulating sunlight.
In order to achieve the above purpose, the invention provides a white tea leaf withering method for simulating sunlight, which comprises the following steps:
a withering stage for obtaining white tea according to the tea image of the withering area;
determining an environmental parameter adjustment value according to the withering stage, wherein the environmental parameter comprises temperature, humidity, carbon dioxide concentration and oxygen concentration;
and adjusting the illumination and humidity of the withered area according to the environmental parameter adjustment value.
According to one aspect of the invention, the withering stage for obtaining white tea from the colour of the tea leaves in the withered area comprises:
acquiring image color characteristics of the withering area according to the tea image of the withering area;
converting the tea image in the withering area into a gray level image, and extracting texture features of the tea;
morphological treatment is carried out on the gray level image to obtain the curling characteristics of the tea;
inputting the color features, texture features and curl features of the image into a vector machine classification model to obtain the classification of the withering stage of the white tea.
According to one aspect of the invention, determining the environmental parameter adjustment value from the withering stage comprises:
constructing a linear model according to preset initial and final environmental parameters of the withering stage, and determining the position of the current environmental parameters in the linear model;
and determining the initial or final environmental parameter of the withering stage as a target value according to the relative relation between the stay time of the current withering stage and the position of the current environmental parameter in the linear model, and generating an adjustment value of the environmental parameter based on the target value.
According to one aspect of the invention, the temperature, carbon dioxide concentration and oxygen concentration of the withered zone are adjusted by adjusting the illumination; the humidity in the withered zone is adjusted by adjusting the humidity.
According to one aspect of the invention, the adjustment value of the illumination is the sum of the power steps of the fluorescent lamp corresponding to the temperature, the carbon dioxide concentration and the oxygen concentration of the withered area.
According to one aspect of the invention, the simulated daylight is turned off when the humidity is greater than the humidity level of the initial and final environmental parameters of the withering stage and the dehumidifier is turned on when the humidity reaches the humidity level of the initial and final environmental parameters of the withering stage.
According to one aspect of the invention, when the humidity is below the humidity level of the initial and final environmental parameters of the withering stage, the simulated sunlight is dimmed to a power minimum and the humidifier is turned on until the humidity reaches the humidity level of the initial and final environmental parameters of the withering stage.
In order to achieve the above object, the present invention provides a white tea leaf withering method system simulating sunlight, comprising:
withering stage acquisition module: a withering stage for obtaining white tea according to the tea image of the withering area;
the environmental parameter adjustment value acquisition module: determining an environmental parameter adjustment value according to the withering stage, wherein the environmental parameter comprises temperature, humidity, carbon dioxide concentration and oxygen concentration;
An environmental parameter adjustment module: and adjusting the illumination and humidity of the withered area according to the environmental parameter adjustment value.
To achieve the above object, the present invention provides an electronic device, including a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the computer program when executed by the processor implements the above-mentioned white tea leaf withering method for simulating sunlight.
To achieve the above object, the present invention provides a computer readable storage medium having a computer program stored thereon, which when executed by a processor, implements the above-described method for withering white tea leaves against a simulated sunlight.
Based on the above, the invention has the beneficial effects that: proper withering of tea leaves can be ensured, and tea leaf breakage and influence on tea leaf grade in the withering process are avoided.
Drawings
FIG. 1 is a flow chart of a method for simulating withering of white tea leaves in sunlight according to the present invention;
figure 2 is a flow chart of a white tea leaf withering method system simulating sunlight.
Detailed Description
The present disclosure will now be discussed with reference to exemplary embodiments, it being understood that the embodiments discussed are merely for the purpose of enabling those of ordinary skill in the art to better understand and thus practice the present disclosure and do not imply any limitation to the scope of the present disclosure.
As used herein, the term "comprising" and variants thereof are to be interpreted as meaning "including but not limited to" open-ended terms. The terms "based on" and "based at least in part on" are to be construed as "at least one embodiment.
Fig. 1 is a flowchart of a method for simulating withering of white tea leaves in sunlight according to an embodiment of the present invention, and as shown in fig. 1, a method for simulating withering of white tea leaves in sunlight includes:
in order to achieve the above purpose, the invention provides a white tea leaf withering method for simulating sunlight, which comprises the following steps:
a withering stage for obtaining white tea according to the tea image of the withering area;
determining an environmental parameter adjustment value according to the withering stage, wherein the environmental parameter comprises temperature, humidity, carbon dioxide concentration and oxygen concentration;
and adjusting the illumination and humidity of the withered area according to the environmental parameter adjustment value.
According to one embodiment of the invention, the withering stage for obtaining white tea from the colour of the tea leaves in the withered area comprises:
acquiring image color characteristics of the withering area according to the tea image of the withering area;
converting the tea image in the withering area into a gray level image, and extracting texture features of the tea;
Morphological treatment is carried out on the gray level image to obtain the curling characteristics of the tea;
inputting the color features, texture features and curl features of the image into a vector machine classification model to obtain the classification of the withering stage of the white tea.
According to one embodiment of the invention, determining the environmental parameter adjustment value according to the withering stage comprises:
constructing a linear model according to preset initial and final environmental parameters of the withering stage, and determining the position of the current environmental parameters in the linear model;
and determining the initial or final environmental parameter of the withering stage as a target value according to the relative relation between the stay time of the current withering stage and the position of the current environmental parameter in the linear model, and generating an adjustment value of the environmental parameter based on the target value.
According to one embodiment of the invention, the temperature, carbon dioxide concentration and oxygen concentration of the withered zone are adjusted by adjusting the illumination; the humidity in the withered zone is adjusted by adjusting the humidity.
According to one embodiment of the invention, the adjustment value of the illumination is the sum of the power steps of the fluorescent lamp corresponding to the temperature, the carbon dioxide concentration and the oxygen concentration of the withered area.
According to one embodiment of the invention, the simulated daylight is turned off when the humidity is greater than the humidity of the initial and final environmental parameters of the withering stage and the dehumidifier is turned on when the humidity reaches the humidity of the initial and final environmental parameters of the withering stage.
According to one embodiment of the invention, when the humidity is below the humidity level of the initial and final environmental parameters of the withering stage, the simulated sunlight is adjusted to a power minimum and the humidifier is turned on until the humidity reaches the humidity level of the initial and final environmental parameters of the withering stage.
According to one embodiment of the invention, the shape and the surface color of the white tea leaf change along with the loss of moisture in the withering process, and the withering stage of the white tea can be judged by acquiring the changes of the color and the shape. Although the withering stage can be determined empirically and according to the actual withering time period, the inventor finds that, in the actual processing of the tea, the actual withering time period of the tea is not consistent with the actual withering time period due to the condition of picking the tea, the tea itself and the change of the environment, the actual withering stage is determined according to the actual color and edge shape change, and the actual withering stage is determined according to the difference of the withering results introduced by the actual withering process adjusting environmental parameters, i.e. if the actual withering time period in the withering chamber is defined as the time period t, the actual withering time period t 'can always be corresponding to the virtual better withering process through the analysis of the color and the edge, and the actual withering parameters are adjusted according to the process parameters corresponding to the virtual withering time period t'. Wherein, the tea quality has great influence on the tea quality after the subsequent spreading, withering and light piling process. The colors of the tea leaves are different according to the elements in the soil, the picking time and the tea tree varieties, so that the color factors are considered in the process of constructing the judging model in the stage.
According to one embodiment of the invention, to implement the white tea withering process of the invention, the white tea withering process is performed in a controlled environment, which may be a withering booth equipped with a plurality of sensors or a separately provided withering chamber containing sensors. Specifically, a withering room is taken as an example. The sensor is added on the basis of a traditional withering room and is used for collecting information of the withering room, a plurality of tea leaves are arranged in the withering room, a plurality of layers of tea leaves are arranged on the tea leaves spreading frame, a camera is arranged on the tea leaves spreading frame on the top layer and used for collecting the color and shape of tea leaves, and the camera can be arranged to move up and down and left and right in a certain range and ensure that a clear image is collected and obtained. Other sensors such as a carbon dioxide sensor, an oxygen sensor, a temperature sensor, a humidity sensor and a far infrared temperature sensor are arranged in the withering chamber and are respectively used for acquiring carbon dioxide concentration, oxygen concentration, temperature, humidity and temperature information, and an LED light source is also arranged in the withering chamber and is used for providing simulation of sunlight; a humidifier is also provided for providing additional humidity and an air energy dehumidifier fan is provided for reducing the humidity according to instructions when the humidity in the withering room exceeds a threshold. The indoor is also provided with a fan for providing indoor air circulation, and the indoor air is kept circulating, so the invention assumes that the concentration of the gas detected by the sensor at any place in the withered room is representative.
According to one embodiment of the invention, a more specific withering room has an arrangement that simulates the intelligent control of sunlight withering a single area of 90 square meters. 6 air energy dehumidifiers are arranged in the room and used for controlling indoor humidity, fans are arranged side by side, and hot air is promoted to flow into the spreading frame. Simultaneously, the exhaust fan is reasonably arranged, so that wet and hot waste in a narrow passage is guided to be discharged, and wet and cold air between the spreading frame layers is attracted to flow to the external space, so that the air flow is promoted, and the air age is reduced. The bottom of the spreading frame is provided with an on-line monitoring sensor, and the top of the spreading frame is provided with a variable light LED light source. And designing a control system to realize on-line detection of withering quality and environment, and forming feedback adjustment according to a model related to the withering quality and technological parameters to finish intelligent control of the withering process.
According to one embodiment of the invention, the tea leaf drying machine can be further carried out by adopting an independent withering bin, a tea leaf drying table is arranged in the withering bin, an image sensor is arranged on the tea leaf drying table and used for collecting the color and shape of tea leaves, and the image sensor can be arranged to move up and down and left and right within a certain range and ensure that a clearer image is collected and obtained. Other sensors such as a carbon dioxide sensor, an oxygen sensor, a temperature sensor, a humidity sensor and a far infrared temperature sensor are arranged in the withering bin and are respectively used for acquiring carbon dioxide concentration, oxygen concentration, temperature, humidity and temperature information, and an LED light source is also arranged in the withering bin and is used for providing simulation of sunlight; a humidifier is also provided for providing additional humidity and an air energy dehumidifier fan is provided for reducing the humidity according to instructions when the humidity in the withering room exceeds a threshold. The inside of the bin is also provided with a circulating fan for providing air circulation in the bin, and the withering bin has smaller volume, so that the invention assumes that the gas concentration measured by any sensor in the withering bin is representative.
According to one embodiment of the present invention, the tea processing process pre-environment of the white tea of the present invention further comprises the following steps: picking, before rain, adopting one bud and one leaf, two buds and one leaf or three leaves of the tea leaves, picking tea with the hands, slightly picking and placing the tea leaves with the handles, and transporting the tea leaves to a processing plant after picking and during the time to ensure the quality of fresh leaves;
withering, placing the tea leaves in a withering tank for natural ventilation, and stacking the tea leaves with the thickness of 7cm.
According to one embodiment of the invention, reference is made to a specific implementation of the control of the withering process, in particular:
firstly, collecting color, shape, temperature, humidity and carbon dioxide concentration information of tea leaves under a plurality of ideal environments in a withering process, wherein the information is used for training a vector machine classification model.
The input of the vector machine classification model comprises color features of images of withered areas, texture features of tea leaves and bending features of the tea leaves, wherein the color features of the images are used for classifying the colors of the tea leaves, and the main process is to score the color features of the images according to dominant hue; the texture features and curl features of the image are used for classifying the grades of the tea leaves, for example, classifying according to the number of included branches and buds (such as one bud and two leaves), and obtaining tea registration, and different grades correspond to different withering methods due to inconsistent tea components. In the process, a withering database of the tea leaves needs to be established, namely images of different positions in the withering process are acquired through a camera, the resolution of the images can be 1080p, the images are marked, the marked labels comprise the grade of the tea leaves and the withering stage of the tea leaves, when the withering stage of the tea leaves comprises time t, the percentage obtained by the actual withering time t'/t is taken as the progress, and different labels are given according to the progress.
And then, model optimization is carried out in a machine learning mode, and a trained vector machine classification model is obtained.
According to one embodiment of the invention, the withering stage for obtaining white tea from the colour of the tea leaves in the withered area comprises:
acquiring image color characteristics of the withering area according to the image of the withering area;
converting the withering area image into a gray level image, and extracting texture features of the tea;
morphological treatment is carried out on the gray level image to obtain the curling characteristics of the tea;
inputting the color features, texture features and curl features of the image into a vector machine classification model to obtain the classification of the withering stage of the white tea.
In one embodiment of the invention, the image color features are extracted as follows:
selecting a withering tray which does not contain a background area for image sampling to obtain a tea image sample;
graying the tea image sample, enhancing the image contrast through piecewise gray linear transformation, and then respectively carrying out median filtering noise reduction treatment on the color image and the gray image by using a median filter;
extracting RGB color features of a color image by using the color histogram, and respectively normalizing to obtain the color features;
further, extracting textures of the gray level image of the tea sample, and carrying out normalization processing to obtain texture features;
Further, using algorithms such as edge detection and skeleton detection in an OpenCV library to identify all identifiable target tea leaves, and calculating the curling degree to obtain classification of the tea leaves, namely bending and unbending, and obtaining curling characteristics of the tea leaves according to the occupation ratio of the tea leaves;
respectively normalizing and splicing the characteristics to obtain a final tea image characteristic vector;
and inputting the tea image feature vectors into a vector machine classification model to obtain the classification of the withering stage of the white tea.
According to one embodiment of the invention, the step of determining the environmental parameter adjustment value comprises:
constructing a linear model according to preset initial and final environmental parameters of the withering stage, and determining the position of the current environmental parameters in the linear model;
and determining the initial or final environmental parameter of the withering stage as a target value according to the relative relation between the stay time of the current withering stage and the position of the current environmental parameter in the linear model, and generating an adjustment value of the environmental parameter based on the target value.
In the invention, the technological process is determined in advance by a clustering analysis method for tea leaves with different grades and sources, and when the grade of the tea leaves (which can be adjusted according to the progress in the withering process) is determined, the corresponding withering process is adopted to wither the tea leaves.
In the different withering stages, which are sensitive to humidity, temperature, the applicant has found that the withering process of the tea leaves can be regulated by regulating the illumination of the LED lamps in relation to the enclosed withering chamber.
Further, if the withering process of tea leaves is divided into n stages, i.e., s= { Si,1< = i < = n }, the optimum initial illumination intensity L0, temperature T0, and humidity H0, and the optimum end illumination intensity L1, temperature T1, and humidity H1 may be set corresponding to each Si. In the withering process, the light intensity, the temperature and the humidity can be controlled linearly to realize the optimal withering effect, namely, a linear withering model is adopted to realize the control of the stage division.
In this process, the step of determining the adjustment value of the environmental parameter may be performed at regular time, and in the performing, the start or end environmental parameter of the withering stage to be used is determined as a target value according to the relative relationship between the stay time of the current withering stage and the position of the current environmental parameter in the linear model, and the adjustment value of the environmental parameter is generated based on the target value. I.e. when the actual process is too fast, withering the tea leaves under withering conditions near the end point or the starting point.
According to one embodiment of the invention, the temperature, carbon dioxide concentration and oxygen concentration of the withered zone are adjusted by adjusting the illumination; the humidity in the withered zone is adjusted by adjusting the humidity.
Light influences the withering process in the withering process, so that the withering temperature is influenced, and according to the experimental result, the humidity is controlled by the light for a long time, so that the applicant adjusts the temperature, the carbon dioxide concentration and the oxygen concentration of the withering area by adjusting the light; adjusting the humidity in the withering area by adjusting the humidity; the effect of the illumination adjustment is reduced near the end of the withering process, however the humidity adjustment remains highly efficient, but the illumination allows better process control for the former part of the withering process.
According to one embodiment of the invention, the adjustment value of the illumination is the sum of the power steps of the fluorescent lamp corresponding to the temperature, the carbon dioxide concentration and the oxygen concentration of the withered area.
The adjustment value of the illumination p=p1+p2+p3,
respectively representing the adjustment value of illumination, and the sum of power step sizes of fluorescent lamps corresponding to the temperature, the carbon dioxide concentration and the oxygen concentration of the withering area;
if P is negative, the power of the fluorescent lamp is reduced, and if P is positive, the power of the fluorescent lamp is increased.
Here, P1, P2 and P3 are obtained according to statistical information, i.e. a variable is kept unchanged, the influence of power of the LED or the like on temperature, carbon dioxide concentration and oxygen concentration is increased or decreased, and an adjustment value is calculated according to the influence. For example, if the humidity is increased by 1%, the fluorescent lamp power is reduced by 0.5W.
According to one embodiment of the invention, the simulated daylight is turned off when the humidity is greater than the humidity level of the initial and final environmental parameters of the withering stage, and the dehumidifier is turned on when the humidity reaches the humidity level of the initial and final environmental parameters of the withering stage.
In this way, proper withering of the tea leaves can be ensured, avoiding unintended fermentation during the withering process.
According to one embodiment of the invention, when the humidity is below the humidity level of the initial and final environmental parameters of the withering stage, the simulated sunlight is dimmed to a power minimum and the humidifier is turned on until the humidity reaches the humidity level of the initial and final environmental parameters of the withering stage.
In this way, proper withering of the tea leaves can be ensured, and breakage of the tea leaves and influence on the tea leaf grade in the withering process are avoided.
According to one embodiment of the invention, the latter is used as the actual withering stage when the withering stage taken at the actual withering time of the tea leaves is not identical to the withering stage taken according to the color of the tea leaves in the withering area, to avoid the influence of uncontrollable factors on the withering result.
Furthermore, to achieve the above object, the present invention also provides a white tea leaf withering method system simulating sunlight, and fig. 2 is a flowchart of a white tea leaf withering method system simulating sunlight in the present invention, as shown in fig. 2, a white tea leaf withering method system simulating sunlight in the present invention includes:
withering stage acquisition module: a withering stage for obtaining white tea according to the tea image of the withering area;
the environmental parameter adjustment value acquisition module: determining an environmental parameter adjustment value according to the withering stage, wherein the environmental parameter comprises temperature, humidity, carbon dioxide concentration and oxygen concentration;
an environmental parameter adjustment module: and adjusting the illumination and humidity of the withered area according to the environmental parameter adjustment value.
According to one embodiment of the invention, the withering stage for obtaining white tea from the colour of the tea leaves in the withered area comprises:
acquiring image color characteristics of the withering area according to the tea image of the withering area;
converting the tea image in the withering area into a gray level image, and extracting texture features of the tea;
morphological treatment is carried out on the gray level image to obtain the curling characteristics of the tea;
inputting the color features, texture features and curl features of the image into a vector machine classification model to obtain the classification of the withering stage of the white tea.
According to one embodiment of the invention, determining the environmental parameter adjustment value according to the withering stage comprises:
constructing a linear model according to preset initial and final environmental parameters of the withering stage, and determining the position of the current environmental parameters in the linear model;
and determining the initial or final environmental parameter of the withering stage as a target value according to the relative relation between the stay time of the current withering stage and the position of the current environmental parameter in the linear model, and generating an adjustment value of the environmental parameter based on the target value.
According to one embodiment of the invention, the temperature, carbon dioxide concentration and oxygen concentration of the withered zone are adjusted by adjusting the illumination; the humidity in the withered zone is adjusted by adjusting the humidity.
According to one embodiment of the invention, the adjustment value of the illumination is the sum of the power steps of the fluorescent lamp corresponding to the temperature, the carbon dioxide concentration and the oxygen concentration of the withered area.
According to one embodiment of the invention, the simulated daylight is turned off when the humidity is greater than the humidity of the initial and final environmental parameters of the withering stage and the dehumidifier is turned on when the humidity reaches the humidity of the initial and final environmental parameters of the withering stage.
According to one embodiment of the invention, when the humidity is below the humidity level of the initial and final environmental parameters of the withering stage, the simulated sunlight is adjusted to a power minimum and the humidifier is turned on until the humidity reaches the humidity level of the initial and final environmental parameters of the withering stage.
According to one embodiment of the invention, the shape and the surface color of the white tea leaf change along with the loss of moisture in the withering process, and the withering stage of the white tea can be judged by acquiring the changes of the color and the shape. Although the withering stage can be determined empirically and according to the actual withering time period, the inventor finds that, in the actual processing of the tea, the actual withering time period of the tea is not consistent with the actual withering time period due to the condition of picking the tea, the tea itself and the change of the environment, the actual withering stage is determined according to the actual color and edge shape change, and the actual withering stage is determined according to the difference of the withering results introduced by the actual withering process adjusting environmental parameters, i.e. if the actual withering time period in the withering chamber is defined as the time period t, the actual withering time period t 'can always be corresponding to the virtual better withering process through the analysis of the color and the edge, and the actual withering parameters are adjusted according to the process parameters corresponding to the virtual withering time period t'. Wherein, the tea quality has great influence on the tea quality after the subsequent spreading, withering and light piling process. The colors of the tea leaves are different according to the elements in the soil, the picking time and the tea tree varieties, so that the color factors are considered in the process of constructing the judging model in the stage.
According to one embodiment of the invention, to implement the white tea withering process of the invention, the white tea withering process is performed in a controlled environment, which may be a withering booth equipped with a plurality of sensors or a separately provided withering chamber containing sensors. Specifically, a withering room is taken as an example. The sensor is added on the basis of a traditional withering room and is used for collecting information of the withering room, a plurality of tea leaves are arranged in the withering room, a plurality of layers of tea leaves are arranged on the tea leaves spreading frame, a camera is arranged on the tea leaves spreading frame on the top layer and used for collecting the color and shape of tea leaves, and the camera can be arranged to move up and down and left and right in a certain range and ensure that a clear image is collected and obtained. Other sensors such as a carbon dioxide sensor, an oxygen sensor, a temperature sensor, a humidity sensor and a far infrared temperature sensor are arranged in the withering chamber and are respectively used for acquiring carbon dioxide concentration, oxygen concentration, temperature, humidity and temperature information, and an LED light source is also arranged in the withering chamber and is used for providing simulation of sunlight; a humidifier is also provided for providing additional humidity and an air energy dehumidifier fan is provided for reducing the humidity according to instructions when the humidity in the withering room exceeds a threshold. The indoor is also provided with a fan for providing indoor air circulation, and the indoor air is kept circulating, so the invention assumes that the concentration of the gas detected by the sensor at any place in the withered room is representative.
According to one embodiment of the invention, a more specific withering room has an arrangement that simulates the intelligent control of sunlight withering a single area of 90 square meters. 6 air energy dehumidifiers are arranged in the room and used for controlling indoor humidity, fans are arranged side by side, and hot air is promoted to flow into the spreading frame. Simultaneously, the exhaust fan is reasonably arranged, so that wet and hot waste in a narrow passage is guided to be discharged, and wet and cold air between the spreading frame layers is attracted to flow to the external space, so that the air flow is promoted, and the air age is reduced. The bottom of the spreading frame is provided with an on-line monitoring sensor, and the top of the spreading frame is provided with a variable light LED light source. And designing a control system to realize on-line detection of withering quality and environment, and forming feedback adjustment according to a model related to the withering quality and technological parameters to finish intelligent control of the withering process.
According to one embodiment of the invention, the tea leaf drying machine can be further carried out by adopting an independent withering bin, a tea leaf drying table is arranged in the withering bin, an image sensor is arranged on the tea leaf drying table and used for collecting the color and shape of tea leaves, and the image sensor can be arranged to move up and down and left and right within a certain range and ensure that a clearer image is collected and obtained. Other sensors such as a carbon dioxide sensor, an oxygen sensor, a temperature sensor, a humidity sensor and a far infrared temperature sensor are arranged in the withering bin and are respectively used for acquiring carbon dioxide concentration, oxygen concentration, temperature, humidity and temperature information, and an LED light source is also arranged in the withering bin and is used for providing simulation of sunlight; a humidifier is also provided for providing additional humidity and an air energy dehumidifier fan is provided for reducing the humidity according to instructions when the humidity in the withering room exceeds a threshold. The inside of the bin is also provided with a circulating fan for providing air circulation in the bin, and the withering bin has smaller volume, so that the invention assumes that the gas concentration measured by any sensor in the withering bin is representative.
According to one embodiment of the present invention, the tea processing process pre-environment of the white tea of the present invention further comprises the following steps: picking, before rain, adopting one bud and one leaf, two buds and one leaf or three leaves of the tea leaves, picking tea with the hands, slightly picking and placing the tea leaves with the handles, and transporting the tea leaves to a processing plant after picking and during the time to ensure the quality of fresh leaves;
withering, placing the tea leaves in a withering tank for natural ventilation, and stacking the tea leaves with the thickness of 7cm.
According to one embodiment of the invention, reference is made to a specific implementation of the control of the withering process, in particular:
firstly, collecting color, shape, temperature, humidity and carbon dioxide concentration information of tea leaves under a plurality of ideal environments in a withering process, wherein the information is used for training a vector machine classification model.
The input of the vector machine classification model comprises color features of images of withered areas, texture features of tea leaves and bending features of the tea leaves, wherein the color features of the images are used for classifying the colors of the tea leaves, and the main process is to score the color features of the images according to dominant hue; the texture features and curl features of the image are used for classifying the grades of the tea leaves, for example, classifying according to the number of included branches and buds (such as one bud and two leaves), and obtaining tea registration, and different grades correspond to different withering methods due to inconsistent tea components. In the process, a withering database of the tea leaves needs to be established, namely images of different positions in the withering process are acquired through a camera, the resolution of the images can be 1080p, the images are marked, the marked labels comprise the grade of the tea leaves and the withering stage of the tea leaves, when the withering stage of the tea leaves comprises time t, the percentage obtained by the actual withering time t'/t is taken as the progress, and different labels are given according to the progress.
And then, model optimization is carried out in a machine learning mode, and a trained vector machine classification model is obtained.
According to one embodiment of the invention, the withering stage for obtaining white tea from the colour of the tea leaves in the withered area comprises:
acquiring image color characteristics of the withering area according to the image of the withering area;
converting the withering area image into a gray level image, and extracting texture features of the tea;
morphological treatment is carried out on the gray level image to obtain the curling characteristics of the tea;
inputting the color features, texture features and curl features of the image into a vector machine classification model to obtain the classification of the withering stage of the white tea.
In one embodiment of the invention, the image color features are extracted as follows:
selecting a withering tray which does not contain a background area for image sampling to obtain a tea image sample;
graying the tea image sample, enhancing the image contrast through piecewise gray linear transformation, and then respectively carrying out median filtering noise reduction treatment on the color image and the gray image by using a median filter;
extracting RGB color features of a color image by using the color histogram, and respectively normalizing to obtain the color features;
further, extracting textures of the gray level image of the tea sample, and carrying out normalization processing to obtain texture features;
Further, using algorithms such as edge detection and skeleton detection in an OpenCV library to identify all identifiable target tea leaves, and calculating the curling degree to obtain classification of the tea leaves, namely bending and unbending, and obtaining curling characteristics of the tea leaves according to the occupation ratio of the tea leaves;
respectively normalizing and splicing the characteristics to obtain a final tea image characteristic vector;
and inputting the tea image feature vectors into a vector machine classification model to obtain the classification of the withering stage of the white tea.
According to one embodiment of the invention, the step of determining the environmental parameter adjustment value comprises:
constructing a linear model according to preset initial and final environmental parameters of the withering stage, and determining the position of the current environmental parameters in the linear model;
and determining the initial or final environmental parameter of the withering stage as a target value according to the relative relation between the stay time of the current withering stage and the position of the current environmental parameter in the linear model, and generating an adjustment value of the environmental parameter based on the target value.
In the invention, the technological process is determined in advance by a clustering analysis method for tea leaves with different grades and sources, and when the grade of the tea leaves (which can be adjusted according to the progress in the withering process) is determined, the corresponding withering process is adopted to wither the tea leaves.
In the different withering stages, which are sensitive to humidity, temperature, the applicant has found that the withering process of the tea leaves can be regulated by regulating the illumination of the LED lamps in relation to the enclosed withering chamber.
Further, if the withering process of tea leaves is divided into n stages, i.e., s= { Si,1< = i < = n }, the optimum initial illumination intensity L0, temperature T0, and humidity H0, and the optimum end illumination intensity L1, temperature T1, and humidity H1 may be set corresponding to each Si. In the withering process, the light intensity, the temperature and the humidity can be controlled linearly to realize the optimal withering effect, namely, a linear withering model is adopted to realize the control of the stage division.
In this process, the step of determining the adjustment value of the environmental parameter may be performed at regular time, and in the performing, the start or end environmental parameter of the withering stage to be used is determined as a target value according to the relative relationship between the stay time of the current withering stage and the position of the current environmental parameter in the linear model, and the adjustment value of the environmental parameter is generated based on the target value. I.e. when the actual process is too fast, withering the tea leaves under withering conditions near the end point or the starting point.
According to one embodiment of the invention, the temperature, carbon dioxide concentration and oxygen concentration of the withered zone are adjusted by adjusting the illumination; the humidity in the withered zone is adjusted by adjusting the humidity.
Light influences the withering process in the withering process, so that the withering temperature is influenced, and according to the experimental result, the humidity is controlled by the light for a long time, so that the applicant adjusts the temperature, the carbon dioxide concentration and the oxygen concentration of the withering area by adjusting the light; adjusting the humidity in the withering area by adjusting the humidity; the effect of the illumination adjustment is reduced near the end of the withering process, however the humidity adjustment remains highly efficient, but the illumination allows better process control for the former part of the withering process.
According to one embodiment of the invention, the adjustment value of the illumination is the sum of the power steps of the fluorescent lamp corresponding to the temperature, the carbon dioxide concentration and the oxygen concentration of the withered area.
The adjustment value of the illumination p=p1+p2+p3,
respectively representing the adjustment value of illumination, and the sum of power step sizes of fluorescent lamps corresponding to the temperature, the carbon dioxide concentration and the oxygen concentration of the withering area;
if P is negative, the power of the fluorescent lamp is reduced, and if P is positive, the power of the fluorescent lamp is increased.
Here, P1, P2 and P3 are obtained according to statistical information, i.e. a variable is kept unchanged, the influence of power of the LED or the like on temperature, carbon dioxide concentration and oxygen concentration is increased or decreased, and an adjustment value is calculated according to the influence. For example, if the humidity is increased by 1%, the fluorescent lamp power is reduced by 0.5W.
According to one embodiment of the invention, the simulated daylight is turned off when the humidity is greater than the humidity level of the initial and final environmental parameters of the withering stage, and the dehumidifier is turned on when the humidity reaches the humidity level of the initial and final environmental parameters of the withering stage.
In this way, proper withering of the tea leaves can be ensured, avoiding unintended fermentation during the withering process.
According to one embodiment of the invention, when the humidity is below the humidity level of the initial and final environmental parameters of the withering stage, the simulated sunlight is dimmed to a power minimum and the humidifier is turned on until the humidity reaches the humidity level of the initial and final environmental parameters of the withering stage.
In this way, proper withering of the tea leaves can be ensured, and breakage of the tea leaves and influence on the tea leaf grade in the withering process are avoided.
According to one embodiment of the invention, the latter is used as the actual withering stage when the withering stage taken at the actual withering time of the tea leaves is not identical to the withering stage taken according to the color of the tea leaves in the withering area, to avoid the influence of uncontrollable factors on the withering result.
In order to achieve the above object, the present invention also provides an electronic device including: the white tea withering method comprises a processor, a memory and a computer program which is stored in the memory and can run on the processor, wherein the computer program realizes the white tea withering method simulating sunlight when being executed by the processor.
To achieve the above object, the present invention further provides a computer readable storage medium having a computer program stored thereon, which when executed by a processor, implements a method for withering white tea leaves simulating sunlight as described above.
Based on the above, the tea withering machine has the beneficial effects that proper withering of tea can be ensured through the tea withering machine, and tea breakage and influence on tea grade in the withering process are avoided.
Those of ordinary skill in the art will appreciate that the modules and algorithm steps described in connection with the embodiments disclosed herein can be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the apparatus and device described above may refer to corresponding procedures in the foregoing method embodiments, which are not described herein again.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, and for example, the division of the modules is merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or modules, which may be in electrical, mechanical, or other forms.
The modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical modules, i.e., may be located in one place, or may be distributed over a plurality of network modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment of the invention.
In addition, each functional module in the embodiment of the present invention may be integrated in one processing module, or each module may exist alone physically, or two or more modules may be integrated in one module.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method for energy saving signal transmission/reception of the various embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, etc.
The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the invention. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.
It should be understood that, the sequence numbers of the steps in the summary and the embodiments of the present invention do not necessarily mean the order of execution, and the execution order of the processes should be determined by the functions and the internal logic, and should not be construed as limiting the implementation process of the embodiments of the present invention.
Claims (10)
1. A method for simulating withering of white tea leaves in sunlight, comprising the steps of:
a withering stage for obtaining white tea according to the tea image of the withering area;
determining an environmental parameter adjustment value according to the withering stage, wherein the environmental parameter comprises temperature, humidity, carbon dioxide concentration and oxygen concentration;
and adjusting the illumination and humidity of the withered area according to the environmental parameter adjustment value.
2. A method of withering white tea leaves simulating sunlight as claimed in claim 1, wherein the withering stage for obtaining white tea leaves according to the color of the tea leaves in the withered area comprises:
acquiring image color characteristics of the withering area according to the tea image of the withering area;
converting the tea image in the withering area into a gray level image, and extracting texture features of the tea;
morphological treatment is carried out on the gray level image to obtain the curling characteristics of the tea;
inputting the color features, texture features and curl features of the image into a vector machine classification model to obtain the classification of the withering stage of the white tea.
3. A method of withering white tea leaves in the simulation of sunlight as claimed in claim 2, wherein determining the environmental parameter adjustment value based on the withering stage includes:
constructing a linear model according to preset initial and final environmental parameters of the withering stage, and determining the position of the current environmental parameters in the linear model;
and determining the initial or final environmental parameter of the withering stage as a target value according to the relative relation between the stay time of the current withering stage and the position of the current environmental parameter in the linear model, and generating an adjustment value of the environmental parameter based on the target value.
4. A method of withering white tea leaves simulating sunlight as claimed in claim 3, wherein the temperature, carbon dioxide concentration and oxygen concentration of the withered area are adjusted by adjusting the light; the humidity in the withered zone is adjusted by adjusting the humidity.
5. A method for withering white tea leaves simulating sunlight according to claim 4, wherein the adjustment value of the illumination is the sum of the power steps of the fluorescent lamp corresponding to the temperature, the carbon dioxide concentration and the oxygen concentration of the withered area.
6. A method of withering white tea leaves in which the simulated sunlight is turned off and the dehumidifier is turned on when the humidity reaches a high value of the ambient parameters at the start and end of the withering stage, when the humidity is greater than the high value of the ambient parameters at the start and end of the withering stage.
7. A method of withering white tea leaves in simulated sunlight as claimed in claim 6 wherein the simulated sunlight is dimmed to a minimum power level when the humidity is below the humidity level of the initial and final environmental parameters of the withering stage and the humidifier is turned on until the humidity reaches the humidity level of the initial and final environmental parameters of the withering stage.
8. A white tea leaf withering method system simulating sunlight, comprising:
withering stage acquisition module: a withering stage for obtaining white tea according to the tea image of the withering area;
the environmental parameter adjustment value acquisition module: determining an environmental parameter adjustment value according to the withering stage, wherein the environmental parameter comprises temperature, humidity, carbon dioxide concentration and oxygen concentration;
an environmental parameter adjustment module: and adjusting the illumination and humidity of the withered area according to the environmental parameter adjustment value.
9. An electronic device comprising a processor, a memory and a computer program stored on the memory and executable on the processor, the computer program when executed by the processor implementing a daylight-simulating white tea leaf withering method according to any one of claims 1 to 7.
10. A computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, which when executed by a processor, implements a daylight simulating white tea leaf withering method according to any one of claims 1 to 7.
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