A standardization shooting device and method for tea leaf samples

Abstract

The application discloses a kind of standardization shooting device and method of tea sample, comprising: portal frame, portal frame includes two columns and a beam;Cell phone clamping mechanism, cell phone clamping mechanism is set to the middle part of beam;LED panel fill light, LED panel fill light is provided with two groups;Background paper, background paper is laid on horizontal support surface, background paper is located just below cell phone clamping mechanism, the center of background paper corresponds with the central axis of portal frame;Wherein, the fixed angle of the light emitting surface of LED panel fill light and horizontal support surface, the vertical height of the light emitting surface center of LED panel fill light from horizontal support surface is adjustable, the horizontal distance between the light emitting surface center of two groups of LED panel fill light is adjustable.The application is fully standardized, and the picture brightness and size between sample are consistent.The geometry of device, light, cell phone parameter are all locked, and through color calibration, white balance is accurate, and the difference of image shot by different personnel and time is smaller.

Description

Technical Field

[0001] This invention relates to the field of image acquisition technology for tea quality evaluation, and in particular to a standardized imaging device and method for tea samples. Background Technology

[0002] In the tea quality evaluation system, the appearance of dry tea leaves, the color of the tea liquor, and the condition of the infused leaves are the three core indicators constituting sensory evaluation, directly reflecting the grade and quality of the tea. With the rapid development of digital tea grading, online trading, and remote evaluation, taking pictures of samples for appearance display and quality comparison has become the mainstream method in the industry. The consistency of image acquisition directly determines the reliability and comparability of subsequent evaluation results.

[0003] Currently, tea sample photography is generally conducted manually using handheld devices and simple light sources, which has several drawbacks. First, there is a lack of standardized shooting parameters. Key parameters such as shooting distance, lighting angle, white balance, ISO, and shutter speed are all adjusted by operators based on experience. This results in significant discrepancies in color and brightness between images of the same sample taken by different personnel at different times, making it impossible to establish a unified benchmark for horizontal comparison. This severely restricts the accuracy of remote evaluation and batch grading.

[0004] Secondly, the optical properties of dry tea, tea liquor, and tea leaves differ significantly. Dry tea has a rough surface and low reflectivity, tea liquor is liquid with a smooth surface and high reflectivity, and tea leaves are moist with reflectivity between the two. If identical shooting parameters are used, it is easy to have one sample condition that is properly exposed while another condition is overexposed or underexposed. The lack of differentiated parameter schemes for different conditions makes it difficult to ensure the acquisition quality of all three types of images simultaneously.

[0005] Furthermore, batch sample comparison shooting is inefficient. When multiple tea samples need to be compared side-by-side, shooting handheld one by one is not only time-consuming, but also makes it difficult to ensure the uniformity of exposure and color consistency of each sample. Existing devices cannot flexibly switch between single-sample and multi-sample shooting modes, failing to meet the high-efficiency requirements of batch evaluation. In addition, most shooting solutions lack convenient on-site color calibration methods, are easily affected by ambient light interference, and produce color casts, further reducing the standardization of images. Summary of the Invention

[0006] The purpose of this invention is to provide a standardized photographing device and method for tea samples to solve the problems existing in the prior art.

[0007] To achieve the above objectives, the present invention provides the following solution: The present invention provides a standardized photographing device for tea samples, comprising: A gantry frame, comprising two uprights and a crossbeam, wherein the two ends of the crossbeam are slidably connected to the two uprights via positioning components, the length of the crossbeam is adjustable and lockable, and the two uprights are vertically arranged on a horizontal support surface. A mobile phone clamping mechanism is provided in the middle of the crossbeam. The mobile phone clamping mechanism can be adjusted and locked in multiple directions, and the clamping port of the mobile phone clamping mechanism faces the horizontal support surface below. LED flat panel fill light, the LED flat panel fill light is provided in two sets, the two sets of LED flat panel fill lights are respectively arranged on the left and right sides of the gantry frame, the two sets of LED flat panel fill lights are symmetrically arranged on both sides of the central axis of the gantry frame, and the light-emitting surface of the LED flat panel fill light faces the central area below the gantry frame; Background paper, which is laid flat on the horizontal support surface and located directly below the mobile phone clamping mechanism, with the center of the background paper corresponding to the central axis of the gantry frame; The light-emitting surface of the LED flat panel fill light forms a fixed angle with the horizontal support surface. The vertical height of the center of the light-emitting surface of the LED flat panel fill light from the horizontal support surface is adjustable. The horizontal distance between the centers of the light-emitting surfaces of the two sets of LED flat panel fill lights is adjustable.

[0008] According to the standardized photographing device for tea samples provided by the present invention, the uprights of the gantry frame are vertical rod-shaped structures, the crossbeam is a horizontal rod-shaped structure, and sliding sleeves are respectively provided at both ends of the crossbeam. The sliding sleeves are fitted onto the uprights and are slidably engaged with the uprights. A locking knob is provided on the sliding sleeves, which is used to position the sliding sleeves at a set height position of the uprights. The crossbeam is composed of multiple rod segments spliced ​​together, and adjacent rod segments are slidably engaged through a sleeve structure and fixed by a locking member to adjust the overall length of the crossbeam.

[0009] According to the standardized shooting device for tea samples provided by the present invention, the mobile phone clamping mechanism includes a sliding seat and a clamping frame. The sliding seat is fitted onto the crossbeam, and the sliding seat slides and can be locked in place with the crossbeam. The clamping frame is connected to the lower part of the sliding seat, and the clamping frame and the sliding seat are rotatably connected via a rotating shaft and can be locked in place. The clamping frame is provided with a clamping jaw for clamping the shooting device. The clamping frame drives the lens of the shooting device to be vertically downward aligned with the center of the background paper.

[0010] According to the standardized photographing device for tea samples provided by the present invention, the LED flat panel fill light includes a lamp body and a lamp holder. The lamp body is fixed on the lamp holder, and the lamp holder stands on the horizontal support surface. The light-emitting surface of the lamp body is rectangular. The lamp body and the lamp holder are connected by a hinge assembly to adjust the pitch angle. The lamp holder is a telescopic rod structure to adjust the vertical height of the center of the light-emitting surface of the lamp body from the horizontal support surface. The two lamp holders are respectively placed on the left and right sides of the gantry frame and are not connected to the gantry frame.

[0011] The standardized photographing device for tea samples provided by the present invention further includes a circular white tea tasting tray, which is placed at the center of the upper surface of the background paper. The circular white tea tasting tray has a disc-shaped structure with its disc surface facing upwards. The center of the circular white tea tasting tray coincides with the central axis of the gantry frame. The circular white tea tasting tray is used to hold dry tea samples and leaf samples.

[0012] The standardized photographing device for tea samples provided by the present invention further includes a standard tasting cup and a standard white tasting bowl. The standard white tasting bowl is placed at the center of the upper surface of the background paper, with the rim of the standard white tasting bowl facing upwards. The center of the standard white tasting bowl coincides with the central axis of the gantry frame. The standard tasting cup is used to brew tea, and the standard white tasting bowl is used to hold the tea soup.

[0013] According to the standardized photographing device for tea samples provided by the present invention, a base is provided at the bottom of the column, the base is fixedly connected to the lower end of the column, the base is placed on the horizontal support surface, the bottom surface of the base is in contact with the horizontal support surface, and the cross-sectional area of ​​the base is larger than the cross-sectional area of ​​the column.

[0014] According to the standardized photographing device for tea samples provided by the present invention, the background paper is white tracing paper, and a weight is provided on the edge of the background paper. The weight is pressed on the edge of the background paper and is used to position the background paper on the horizontal support surface.

[0015] A standardized method for photographing tea samples includes the following steps: Step 1: Adjust the height and length of the gantry beam according to the shooting mode. In single-sample mode, set the vertical distance of the beam from the horizontal support surface to 50cm and the length to 75cm. In multi-sample mode, set the vertical distance of the beam from the horizontal support surface to 70cm and the length to 105cm. Adjust the height and spacing of the two sets of LED flat-panel fill lights accordingly. In single-sample mode, set the vertical distance from the center of the fill light's emitting surface to the horizontal support surface to 35cm and the horizontal distance between the two lights to 40cm. In multi-sample mode, set the vertical distance from the center of the fill light's emitting surface to the horizontal support surface to 55cm and the horizontal distance between the two lights to 60cm. The fill light's emitting surface and the horizontal support surface should both form a 45° angle. Lay the background paper flat on the horizontal support surface and align it with the central axis of the gantry. Step 2: Install the shooting device onto the phone clamping mechanism. In single-sample mode, adjust the vertical distance between the shooting device lens and the background paper surface to 40cm. In multi-sample mode, adjust the vertical distance between the shooting device lens and the background paper surface to 60cm. After adjustment, lock and fix it. Place the standard white calibration plate in the center of the background paper, turn on the professional mode of the shooting device, select manual white balance, align with the white calibration plate to complete the calibration and lock the white balance value. Set the basic parameters as the maximum usable aperture, ISO 50, exposure compensation 0EV, manual focus, and turn off the flash, HDR, night mode and AI optimization function. Step 3: In single-sample shooting mode, weigh 15g to 20g of dry tea sample and place it in the sample tray and spread it evenly. Place the sample tray in the center of the background paper, set the shutter speed to 1 / 125 seconds, enable 1.5x digital zoom, use the white balance calibration value of 5500K, manually focus on the surface of the dry tea and take a picture of the dry tea. Step 4: In single-sample shooting mode, pour 150ml of brewed tea into a tea bowl, place the tea bowl in the center of the background paper, adjust the shutter speed to 1 / 60 second, white balance to 4200K, and aperture to F4.0 if adjustable. Manually focus on the tea surface slightly below the surface and take a picture of the tea. Then, spread the brewed tea leaves evenly on the sample tray, place the sample tray in the center of the background paper, and resume the shutter speed of 1 / 125 second and white balance at the calibrated value of 5500K. Manually focus on the surface of the tea leaves and take a picture of the tea leaves. Step 5: In multi-sample shooting mode, place 4 to 8 sample trays containing dry tea or tea leaves side by side in the center of the background paper, with even gaps between the trays. Focus on the sample surface in the center and use 1x to 1.5x digital zoom depending on the sample arrangement width. Set the white balance to a calibration value of 5500K and the shutter speed to 1 / 125 second to obtain a side-by-side comparison image of multiple samples. When shooting a comparison of multiple tea infusions, place several tea infusion bowls side by side, set the shutter speed to 1 / 60 second, the white balance to 4200K, and keep all other parameters consistent before shooting.

[0016] The present invention discloses the following technical effects: The overall geometric relationship of this invention can be adjusted and locked. The height and length of the gantry beam, the position of the mobile phone clamping mechanism, and the height and spacing of the fill light can all be adjusted and fixed as needed, forming a stable and unified shooting geometric benchmark, eliminating distance and angle deviations caused by human operation, and ensuring that tea sample images taken by different batches and different operators maintain a high degree of consistency in size and composition.

[0017] This invention employs a structure with two sets of LED flat panel supplementary lights arranged symmetrically. The supplementary lights are symmetrically distributed along the central axis with their light-emitting surfaces facing the central area, which can form a uniform and soft illumination effect. This avoids the shadows and uneven brightness caused by unilateral lighting, ensuring that the surface of the tea sample receives uniform light. This effectively improves the brightness uniformity of the images of dry tea, tea soup, and leaf bottom, providing a reliable image basis for subsequent quality evaluation.

[0018] The gantry and supplementary lights of this invention have multi-dimensional adjustment capabilities. Different shooting configurations can be quickly switched by adjusting the height and length of the crossbeam and the height and spacing of the supplementary lights. It is suitable for various operating scenarios such as fine shooting of single samples and batch comparison of multiple samples. Different shooting needs can be met without replacing the entire set of equipment, which greatly improves the versatility and efficiency of the device. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the standardized photographing device for tea samples according to the present invention.

[0021] The components include: 1. Gantry frame; 2. Mobile phone clamping mechanism; 3. Mobile phone; 4. LED fill light; 5. Background paper; 6. Desktop; 7. Round white tea tasting tray. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Reference Figure 1 This invention provides a standardized photographing device for tea samples, comprising: Gantry 1 includes two columns and one crossbeam. The two ends of the crossbeam are slidably connected to the two columns through positioning components. The length of the crossbeam is adjustable and can be locked. The two columns are vertically arranged on the horizontal support surface. The mobile phone clamping mechanism 2 is located in the middle of the crossbeam. The mobile phone clamping mechanism 2 can be adjusted and locked in multiple directions. The clamping port of the mobile phone clamping mechanism 2 faces the horizontal support surface below. LED flat panel fill light, there are two sets of LED flat panel fill light, the two sets of LED flat panel fill light are respectively arranged on the left and right sides of the gantry frame 1, the two sets of LED flat panel fill light are symmetrically arranged on both sides of the central axis of the gantry frame 1, and the light-emitting surface of the LED flat panel fill light faces the central area below the gantry frame 1. Background paper 5 is laid flat on the horizontal support surface. Background paper 5 is located directly below the mobile phone clamping mechanism 2. The center of background paper 5 corresponds to the central axis of the gantry frame 1. Among them, the light-emitting surface of the LED flat panel fill light forms a fixed angle with the horizontal support surface, the vertical height of the center of the light-emitting surface of the LED flat panel fill light from the horizontal support surface is adjustable, and the horizontal distance between the centers of the light-emitting surfaces of the two sets of LED flat panel fill lights is adjustable.

[0025] Further optimization of the design: the uprights of gantry 1 are vertical rod-like structures, and the crossbeams are horizontal rod-like structures. Sliding sleeves are provided at both ends of the crossbeams, and the sliding sleeves are fitted onto the uprights. The sliding sleeves and uprights slide in a sliding fit. Locking knobs are provided on the sliding sleeves, which are used to position the sliding sleeves at a set height position on the uprights. The crossbeams are composed of multiple rod segments spliced ​​together. Adjacent rod segments slide in a sliding fit through a sleeve structure and are fixed by locking components to adjust the overall length of the crossbeams.

[0026] As the sliding sleeve moves up and down along the column, it drives the crossbeam to rise and fall synchronously, enabling continuous adjustment of the crossbeam height. After adjusting to the target height, tightening the locking knob secures the sliding sleeve by the friction generated when the knob presses against the column surface, locking the crossbeam height. The crossbeam adopts a multi-segment rod-jointed structure. Adjacent rods slide relative to each other along the axial direction to change the total length of the crossbeam. After extending or shortening to the set length, it is locked in place by the locking mechanism, locking the crossbeam span. Together, these two mechanisms allow the crossbeam to be precisely fixed at a height of 50cm and a length of 75cm in single-sample mode, and switch to a height of 70cm and a length of 105cm in multi-sample mode, ensuring the repeatability of the shooting geometric reference and the convenience of mode switching.

[0027] Further optimization of the solution: the mobile phone clamping mechanism 2 includes a sliding seat and a clamping frame. The sliding seat is fitted onto the crossbeam and slides with the crossbeam and can be locked in place. The clamping frame is connected to the lower part of the sliding seat and is rotatably connected to the sliding seat via a rotating shaft and can be locked in place. The clamping frame is provided with a clamping slot for clamping the shooting device. The clamping frame drives the lens of the shooting device to be vertically downward and aligned with the center of the background paper 5.

[0028] The sliding mount is fitted onto the crossbeam. Sliding horizontally along the length of the crossbeam adjusts the lateral position of the clamping mechanism. Locking ensures the mechanism is centered on the crossbeam, aligning the optical axis of the shooting device with the central axis of the gantry 1. The clamping frame is connected to the sliding mount via a pivot. Rotating around the pivot adjusts the tilt angle of the clamping frame. Locking is achieved when the lens is vertically downwards, ensuring the shooting direction is perpendicular to the plane of the background paper 5. The clamp securely holds the shooting device body, firmly fixing it to the clamping frame to prevent displacement or deflection during shooting. The entire mechanism allows for bidirectional adjustment and locking of both horizontal position and tilt angle, precisely maintaining a vertical shooting distance of 540cm or 60cm from the background paper, ensuring consistency in magnification and composition.

[0029] The solution is further optimized. The LED flat panel fill light includes a lamp body and a lamp holder. The lamp body is fixed on the lamp holder, and the lamp holder stands on a horizontal support surface. The light-emitting surface of the lamp body is rectangular. The lamp body and the lamp holder are connected by a hinge assembly to adjust the pitch angle. The lamp holder is a telescopic rod structure to adjust the vertical height of the center of the light-emitting surface of the lamp body from the horizontal support surface. The two lamp holders are placed on the left and right sides of the gantry frame 1 respectively and are not connected to the gantry frame 1.

[0030] The lamp body is connected to the lamp holder via a hinge assembly. Rotation around the hinge axis adjusts the lamp body's tilt angle, locking it at a 45° angle between the lamp surface and the horizontal support surface. This ensures the light shines obliquely onto the sample area, preventing direct sunlight and specular reflection. The lamp holder employs a telescopic rod structure. The relative extension and retraction of the inner and outer rods alters the overall height of the lamp holder, thereby adjusting the vertical distance from the center of the lamp's luminous surface to the tabletop (6). The rod length is locked after extension and retraction. The lamp holders are independently placed on either side of the gantry frame 1, without structural connection to it. Their horizontal position can be independently adjusted to change the center-to-center distance between the two lamps. This structure allows for a fixed lamp height of 35cm and a fixed lamp spacing of 40cm in single-sample mode, while switching between a 55cm height and 60cm spacing in multi-sample mode. Combined with the fixed 45° tilt angle, this creates a symmetrical and uniform illumination field.

[0031] Further optimization of the scheme also includes a circular white tea tasting tray 7, which is placed at the center of the upper surface of the background paper 5. The circular white tea tasting tray 7 has a disc-shaped structure with the disc surface facing upwards. The center of the circular white tea tasting tray 7 coincides with the central axis of the gantry frame 1. The circular white tea tasting tray 7 is used to hold dry tea samples and leaf samples.

[0032] The circular white tea tasting tray 7 serves as a unified container for both dry tea and leaf residue. Its circular structure facilitates centering on the background paper 5, ensuring the sample area is always centered in the frame during each shot. The pure white tray surface matches the background paper 5 in tone, preventing the introduction of distracting colors and providing a uniform reflective background for the dry tea leaves. The tray's depth allows it to hold the tea sample while preventing spillage; a gentle shake ensures the tea leaves are evenly spread. The standardized tea tasting trays guarantee consistent sample area and thickness for each shot, eliminating imaging deviations caused by container differences and ensuring horizontal comparability between the dry tea and leaf residue images.

[0033] Further optimization of the scheme also includes a standard tasting cup and a standard white tasting bowl. The standard white tasting bowl is placed at the center of the upper surface of the background paper 5, with the rim of the standard white tasting bowl facing upwards. The center of the standard white tasting bowl coincides with the central axis of the gantry frame 1. The standard tasting cup is used to brew tea, and the standard white tasting bowl is used to hold the tea soup.

[0034] Standard tasting cups are manufactured according to national standards to standardize the tea brewing process, ensuring consistent tea quantity, water volume, and steeping time, resulting in uniform tea concentration. Standard white tasting bowls serve as the container for both the tea and the photograph. Their uniform volume and rim size ensure that each 150ml of tea poured has the same surface height and area. The white porcelain inner wall creates a uniform diffuse reflection environment, preventing interference from colored containers on the tea's color. When the tasting bowl is placed in the center of the background paper, its center coincides with the optical axis, keeping the tea surface centered in the image, ensuring a consistent composition and providing a standardized container for accurate tea color capture.

[0035] The design is further optimized by installing a base at the bottom of the column, which is fixedly connected to the lower end of the column. The base is placed on a horizontal support surface, with the bottom surface of the base in contact with the horizontal support surface. The cross-sectional area of ​​the base is larger than that of the column.

[0036] The scheme is further optimized by making the background paper 5 white tracing paper. The edge of the background paper 5 is provided with a weight, which is placed on the edge of the background paper 5 to position the background paper 5 on the horizontal support surface.

[0037] A standardized method for photographing tea samples includes the following steps: Step 1: Adjust the height and length of the crossbeam of gantry 1 according to the shooting mode. In single-sample mode, set the vertical height of the crossbeam from the horizontal support surface to 50cm and the length to 75cm. In multi-sample mode, set the vertical height of the crossbeam from the horizontal support surface to 70cm and the length to 105cm. Adjust the height and spacing of the two sets of LED flat panel fill lights accordingly. In single-sample mode, set the vertical height of the center of the fill light's emitting surface from the horizontal support surface to 35cm and the horizontal spacing between the two lights to 40cm. In multi-sample mode, set the vertical height of the center of the fill light's emitting surface from the horizontal support surface to 55cm and the horizontal spacing between the two lights to 60cm. The emitting surface of the fill light and the horizontal support surface should both be at a 45° angle. Lay the background paper 5 flat on the horizontal support surface and align it with the central axis of gantry 1. Step 2: Install the shooting device onto the mobile phone clamping mechanism 2. In single-sample mode, adjust the vertical distance between the shooting device lens and the surface of the background paper 5 to 40cm. In multi-sample mode, adjust the vertical distance between the shooting device lens and the surface of the background paper 5 to 60cm. After adjustment, lock and fix it. Place the standard white calibration plate in the center of the background paper 5. Turn on the professional mode of the shooting device, select manual white balance, align it with the white calibration plate to complete the calibration and lock the white balance value. Set the basic parameters as the maximum usable aperture, ISO 50, exposure compensation 0EV, manual focus, and turn off the flash, HDR, night mode and AI optimization function. Step 3: In single-sample shooting mode, weigh 15g to 20g of dry tea sample and place it in the sample tray and spread it evenly. Place the sample tray in the center of the background paper 5, set the shutter speed to 1 / 125 seconds, enable 1.5x digital zoom, use the calibration value of 5500K for white balance, manually focus on the surface of the dry tea and take a picture of the dry tea. Step 4: In single-sample shooting mode, pour 150ml of brewed tea into a tea bowl, place the tea bowl in the center of background paper 5, adjust the shutter speed to 1 / 60 second, white balance to 4200K, and aperture to F4.0 if adjustable. Manually focus on the tea surface slightly below the tea to obtain the tea image. Then, spread the brewed tea leaves evenly on the sample tray, place the sample tray in the center of background paper 5, and resume the shutter speed of 1 / 125 second and white balance at the calibrated value of 5500K. Manually focus on the surface of the tea leaves to obtain the tea leaf image. Step 5: In multi-sample shooting mode, place 4 to 8 sample trays containing dry tea or tea leaves side by side in the center of background paper 5, with even gaps between the trays. Focus on the sample surface in the center and use 1x to 1.5x digital zoom depending on the sample arrangement width. Set the white balance to a calibration value of 5500K and the shutter speed to 1 / 125 second to obtain a side-by-side comparison image of multiple samples. When shooting a comparison of multiple tea infusions, place several tea infusion bowls side by side, set the shutter speed to 1 / 60 second, the white balance to 4200K, and keep all other parameters consistent to complete the shooting.

[0038] Following the photography, the process also includes digitally extracting and analyzing the appearance and color of the dried tea samples. Specifically, the idea is to eliminate interference from tea leaf texture and shape on color sampling by taking a blurred, out-of-focus photograph of the dried tea samples, obtaining a uniform color block image representing the overall appearance and color of the tea sample; then, through a standardized image processing workflow, extracting the Lab and RGB values ​​of the image, and calculating the hue, lightness, and chroma values.

[0039] This is because in traditional tea evaluation, the appearance and color of the dry tea (such as "emerald green," "dark green," and "yellowish-brown") rely entirely on the visual judgment and subjective description of the tea taster. Even with standardized photographs, the color still needs to be observed and compared by the human eye. This subjective evaluation method has the following problems: First, different tea tasters may describe the same color differently; second, the same tea taster may make inconsistent judgments at different times and under different lighting conditions; third, it is impossible to convert color information into storable, calculable, and comparable digital data, which restricts the digital and intelligent development of tea quality evaluation.

[0040] Therefore, based on standardized photography, an image color extraction method is added to convert the appearance and color of tea leaves into objective colorimetric values. The specific processing flow includes: First, keep the shooting parameters unchanged, adjust the focus mode to out-of-focus mode, and take a blurred shot of the dry tea sample (including 20-pixel Gaussian blur and average blur) to obtain a uniform color block image.

[0041] Next, the image is imported into computer image processing software for color sampling. The computer monitor has been pre-calibrated with a professional colorimeter, and a color management file is loaded during the processing.

[0042] Then, in the image processing software, multiple color samples are taken from the tea sample area, with no fewer than ten sampling points evenly distributed within the tea sample area. The Lab and RGB values ​​of each sampling point are obtained and the arithmetic mean is calculated.

[0043] Finally, based on the average Lab value, the hue value H = arctan(b / a) and the chroma value C = √(a / b) are calculated. 2+b 2 Using lightness (L), hue (H), and chroma (C) as digital representation parameters for the appearance color of the tea sample, the color of the tea sample is digitally stored. In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0044] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A standardized photographing device for tea samples, characterized in that, include: Gantry (1), the gantry (1) includes two columns and a crossbeam, the two ends of the crossbeam are slidably connected to the two columns through positioning components, the length of the crossbeam is adjustable and locked, and the two columns are vertically arranged on the horizontal support surface; A mobile phone clamping mechanism (2) is located in the middle of the crossbeam. The mobile phone clamping mechanism (2) can be adjusted and locked in multiple directions. The clamping port of the mobile phone clamping mechanism (2) faces the horizontal support surface below. LED flat panel fill light, the LED flat panel fill light is provided in two sets, the two sets of LED flat panel fill lights are respectively arranged on the left and right sides of the gantry (1), the two sets of LED flat panel fill lights are symmetrically arranged on both sides of the central axis of the gantry (1), and the light-emitting surface of the LED flat panel fill light faces the central area below the gantry (1). Background paper (5), the background paper (5) is laid flat on the horizontal support surface, the background paper (5) is located directly below the mobile phone clamping mechanism (2), and the center of the background paper (5) corresponds to the central axis of the gantry (1); The light-emitting surface of the LED flat panel fill light forms a fixed angle with the horizontal support surface. The vertical height of the center of the light-emitting surface of the LED flat panel fill light from the horizontal support surface is adjustable. The horizontal distance between the centers of the light-emitting surfaces of the two sets of LED flat panel fill lights is adjustable.

2. The standardized photographing device for tea samples according to claim 1, characterized in that, The uprights of the gantry frame (1) are vertical rod-shaped structures, and the crossbeams are horizontal rod-shaped structures. Sliding sleeves are provided at both ends of the crossbeams. The sliding sleeves are fitted onto the uprights and slide in cooperation with the uprights. A locking knob is provided on the sliding sleeves and is used to position the sliding sleeves at a set height position of the uprights. The crossbeams are composed of multiple rod segments spliced ​​together. Adjacent rod segments slide in cooperation through a sleeve structure and are fixed by locking components to adjust the overall length of the crossbeams.

3. The standardized photographing device for tea samples according to claim 1, characterized in that, The mobile phone clamping mechanism (2) includes a sliding seat and a clamping frame. The sliding seat is fitted onto the crossbeam. The sliding seat slides and can be locked and positioned with the crossbeam. The clamping frame is connected to the lower part of the sliding seat. The clamping frame and the sliding seat are rotatably connected by a rotating shaft and can be locked and positioned. The clamping frame is provided with a clamping slot. The clamping slot is used to clamp the shooting device. The clamping frame drives the lens of the shooting device to be vertically downward aligned with the center of the background paper (5).

4. The standardized photographing device for tea samples according to claim 1, characterized in that, The LED flat panel fill light includes a lamp body and a lamp holder. The lamp body is fixed on the lamp holder, and the lamp holder stands on the horizontal support surface. The light-emitting surface of the lamp body is rectangular. The lamp body and the lamp holder are connected by a hinge assembly to adjust the pitch angle. The lamp holder is a telescopic rod structure to adjust the vertical height of the center of the light-emitting surface of the lamp body from the horizontal support surface. The two lamp holders are respectively placed on the left and right sides of the gantry (1) and are not connected to the gantry (1).

5. The standardized photographing device for tea samples according to claim 1, characterized in that, It also includes a circular white tea tasting tray (7), which is placed at the center of the upper surface of the background paper (5). The circular white tea tasting tray (7) has a disc-shaped structure with the disc surface facing upwards. The center of the circular white tea tasting tray (7) coincides with the central axis of the gantry frame (1). The circular white tea tasting tray (7) is used to hold dry tea samples and leaf samples.

6. The standardized photographing device for tea samples according to claim 1, characterized in that, It also includes a standard tasting cup and a standard white tasting bowl. The standard white tasting bowl is placed at the center of the upper surface of the background paper (5). The rim of the standard white tasting bowl faces upward. The center of the standard white tasting bowl coincides with the central axis of the gantry frame (1). The standard tasting cup is used to brew tea, and the standard white tasting bowl is used to hold the tea soup.

7. The standardized photographing device for tea samples according to claim 1, characterized in that, The column has a base at its bottom, which is fixedly connected to the lower end of the column. The base is placed on the horizontal support surface, and the bottom surface of the base is in contact with the horizontal support surface. The cross-sectional area of ​​the base is larger than that of the column.

8. The standardized photographing device for tea samples according to claim 1, characterized in that, The background paper (5) is white sulfuric acid paper. A weight is provided on the edge of the background paper (5). The weight is pressed on the edge of the background paper (5) and is used to position the background paper (5) on the horizontal support surface.

9. A standardized photographing method for tea samples, based on the standardized photographing apparatus for tea samples according to any one of claims 1-8, characterized in that, Includes the following steps: Step 1: Adjust the height and length of the crossbeam of the gantry (1) according to the shooting mode. In single sample mode, the vertical height of the crossbeam from the horizontal support surface is set to 50cm and the length is set to 75cm. In multi-sample mode, the vertical height of the crossbeam from the horizontal support surface is set to 70cm and the length is set to 105cm. Adjust the height and spacing of the two sets of LED flat fill lights accordingly. In single sample mode, the vertical height of the center of the fill light's emitting surface from the horizontal support surface is set to 35cm and the horizontal spacing between the two lights is set to 40cm. In multi-sample mode, the vertical height of the center of the fill light's emitting surface from the horizontal support surface is set to 55cm and the horizontal spacing between the two lights is set to 60cm. The emitting surface of the fill light and the horizontal support surface are at a 45° angle. Lay the background paper (5) flat on the horizontal support surface and align it with the central axis of the gantry (1). Step 2: Install the shooting device on the mobile phone clamping mechanism (2). In single sample mode, adjust the vertical distance between the lens of the shooting device and the surface of the background paper (5) to 40cm. In multi-sample mode, adjust the vertical distance between the lens of the shooting device and the surface of the background paper (5) to 60cm. After adjustment, lock and fix it. Place the standard white calibration plate in the center of the background paper (5), turn on the professional mode of the shooting device, select manual white balance, align with the white calibration plate to complete the calibration and lock the white balance value. Set the basic parameters as the maximum usable aperture, ISO 50, exposure compensation 0EV, manual focus, and turn off the flash, HDR, night mode and AI optimization function. Step 3: In single sample shooting mode, weigh 15g to 20g of dry tea sample and place it in the sample container and spread it evenly. Place the sample container in the center of the background paper (5), set the shutter speed to 1 / 125 seconds, enable 1.5x digital zoom, use the calibration value of 5500K for white balance, manually focus on the surface of the dry tea and take a picture of the dry tea. Step 4: In single-sample shooting mode, pour 150ml of brewed tea into a tea bowl, place the tea bowl in the center of the background paper (5), adjust the shutter speed to 1 / 60 second, the white balance to 4200K, and the aperture to F4.0 when adjustable. Manually focus on the tea surface slightly below and take a picture of the tea. Place the brewed tea leaves into the sample tray and spread them evenly. Place the sample tray in the center of the background paper (5), restore the shutter speed to 1 / 125 second, the white balance to the calibration value of 5500K, and manually focus on the surface of the tea leaves to take a picture of the tea leaves. Step 5, in multi-sample shooting mode, place 4 to 8 sample trays containing dry tea or tea leaves in rows and columns in the center of the background paper (5), with uniform gaps between the trays. Focus on the sample surface in the middle position, use 1x to 1.5x digital zoom according to the sample arrangement width, use a white balance calibration value of 5500K, and set the shutter speed to 1 / 125 seconds to obtain a multi-sample side-by-side comparison image. When shooting multi-sample tea soup comparison, place several tea soup bowls side by side, set the shutter speed to 1 / 60 seconds, the white balance to 4200K, and keep the other parameters the same to complete the shooting.

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