A method of visualizing an analysis of online evaluation of time-temperature indicator reliability

Abstract

The application discloses an analysis method for visualizing online evaluation of reliability of a time-temperature indicator, and applies to the technical field of food quality monitoring. The method comprises the following steps: presetting a time-temperature change scheme; placing the time-temperature indicator in a thermostat, and adjusting the temperature according to the preset scheme; collecting temperature change images of the time-temperature indicator in real time; performing color similarity calculation on the temperature change images collected in real time at different stages and corresponding standard temperature change images to obtain color similarities at different stages; calculating a reliability index based on the calculation results of the color similarities and weights; and evaluating the reliability of the time-temperature indicator through the reliability index. The method simulates the preset temperature change scheme in the thermostat, collects images in real time, and analyzes the color similarities at different stages to comprehensively judge the reliability of the time-temperature indicator.

Description

Technical Field

[0001] This invention relates to the field of food quality monitoring technology, and more specifically to an analytical method for visually evaluating the reliability of time-temperature indicators online. Background Technology

[0002] With the booming development of the food industry, consumers have higher requirements for food safety and nutrition. To ensure food quality, cold chain logistics has been widely used, and specific temperature requirements have been set for the cold chain. The temperature experienced during production, processing, and sales should be below the specified temperature. However, in cold chain logistics, due to environmental factors and human factors in management, temperature fluctuations, de-cooling, and cooling interruptions often occur, which are extremely detrimental to food quality and safety. To ensure food quality and reduce unnecessary losses, real-time monitoring of the temperature and storage time of food transported through the cold chain is crucial. Therefore, the time-temperature indicator (TTI) has emerged due to its unique and targeted functions. The time-temperature indicator can monitor whether goods meet regulations during transportation and accurately indicate whether the goods have deteriorated, thus avoiding the problem of inaccurate product quality indication caused by the traditional practice of indicating shelf life.

[0003] Given the paramount importance of food safety, the reliability of time-temperature indicators (TTIs) is crucial. Therefore, reliability analysis of TTIs is necessary to ensure food safety. Some less reliable TTIs exhibit color changes as temperature increases, reversing the color change upon cooling. However, current variable-temperature testing primarily involves manually taking photos at intervals and comparing them using standard temperature colors. This approach fails to accurately simulate the temperature changes of food under specific conditions and ignores the slow changes in the TTI indicator, resulting in low accuracy and issues such as untimely data collection and inaccurate comparative analysis results. Therefore, providing a visual, online method for evaluating the reliability of TTIs is a pressing issue for those skilled in the art. Summary of the Invention

[0004] In view of this, the present invention provides a method for visually evaluating the reliability of a time-temperature indicator online. The method involves simulating the temperature change in a constant temperature chamber according to a preset temperature change scheme, acquiring images in real time, and performing color similarity analysis to determine the reliability of the time-temperature indicator.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An analytical method for visually evaluating the reliability of a time-temperature indicator online includes the following steps:

[0007] S1, Preset time-temperature indicator reliability test time-temperature variation scheme;

[0008] S2. Place the time-temperature indicator in the constant temperature chamber, and adjust the temperature of the constant temperature chamber according to the preset scheme;

[0009] S3. Real-time acquisition of temperature change images from the time-temperature indicator;

[0010] S4. Calculate the color similarity between the real-time temperature change images at different stages and the corresponding standard temperature change images to obtain the color similarity at different stages.

[0011] S5. Reliability index of weight calculation for different stages of color similarity calculation results and time-temperature change scheme.

[0012] S6. Evaluate the reliability of the time-temperature indicator using reliability metrics.

[0013] Optionally, the range of the highest and lowest temperatures in the time-temperature variation scheme is -10 to 30°C, and the time is 72 hours. The time-temperature variation scheme divides the time into three stages, each stage lasting 24 hours. Each stage is further divided into multiple sub-stages, and each sub-stage lasts for the same amount of time.

[0014] Optionally, S4 specifically refers to:

[0015] S41. Acquire the real-time temperature change images I respectively. A The one-dimensional normalized color histogram H of the R, G, and B components RA H GA H BA ;

[0016] S42. Obtain standard temperature change images I respectively. B The one-dimensional normalized color histogram H of the R, G, and B components RB H GB H BB ;

[0017] S43. Calculate the real-time acquired temperature change image I A and standard temperature change image I B Color similarity S(I) A ,I B ):

[0018]

[0019] In the formula, r represents a component value of R, g represents a component value of G, and b represents a component value of B.

[0020] Optionally, the reliability index c in S5 is calculated as follows:

[0021] c = w1s1 + w2s2 + w3s3

[0022] In the formula, s1 is the color similarity of the first stage, w1 is the similarity weight of the first stage, s2 is the color similarity of the second stage, w2 is the similarity weight of the second stage, w3 is the color similarity of the third stage, and s3 is the similarity weight of the third stage.

[0023] Optionally, the weight determination scheme for different stages of S5 is as follows: assign importance scales to the three stages respectively to calculate the judgment matrix, perform consistency check on the judgment matrix, and if the consistency meets the standard, normalize the judgment matrix to obtain the weight matrix, and use the elements in the weight matrix as the weight values ​​of the three stages respectively.

[0024] Optionally, the standard temperature change image is a temperature change image of a time-temperature indicator at a fixed temperature over a period of 0-72 hours. The standard temperature change image includes multiple fixed temperatures.

[0025] Optionally, the time-temperature indicator is placed in a constant temperature chamber using a hollow aluminum ingot, the surface of which has grooves for holding the time-temperature indicator.

[0026] As can be seen from the above technical solution, compared with the prior art, the present invention provides a visual online evaluation method for the reliability of time-temperature indicators, which has the following beneficial effects: The present invention simulates the complex temperature changes that may occur in actual transportation by using a preset temperature change scheme to test the time-temperature indicator, avoiding the problem of color reversal in unreliable time-temperature indicators; real-time image acquisition and comparison with standard temperature-time change images are performed, and the analysis process involves multiple stages, using similarity and reliability indicators to improve the accuracy of judgment. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0028] Figure 1 This is a flowchart of the time-temperature indicator reliability analysis method of the present invention. Detailed Implementation

[0029] 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.

[0030] This invention discloses a visual online method for evaluating the reliability of time-temperature indicators, such as... Figure 1 As shown, it includes the following steps:

[0031] S1, Preset time-temperature indicator reliability test time-temperature variation scheme;

[0032] S2. Place the time-temperature indicator in the constant temperature chamber, and adjust the temperature of the constant temperature chamber according to the preset scheme;

[0033] S3. Real-time acquisition of temperature change images from the time-temperature indicator;

[0034] S4. Calculate the color similarity between the real-time temperature change images at different stages and the corresponding standard temperature change images to obtain the color similarity at different stages.

[0035] S5. Reliability index of weight calculation for different stages of color similarity calculation results and time-temperature change scheme.

[0036] S6. Evaluate the reliability of the time-temperature indicator using reliability metrics.

[0037] Furthermore, the range of the highest and lowest temperatures in the time-temperature variation scheme is -10 to 30°C, and the time is 72 hours. The time-temperature variation scheme divides the time into three stages, each stage lasting 24 hours. Each stage is further divided into multiple sub-stages, and each sub-stage lasts for the same amount of time.

[0038] Furthermore, S4 specifically refers to:

[0039] S41. Acquire the real-time temperature change images I respectively. A The one-dimensional normalized color histogram H of the R, G, and B components RA H GA H BA ;

[0040] S42. Obtain standard temperature change images I respectively. B The one-dimensional normalized color histogram H of the R, G, and B components RB H GB H BB ;

[0041] S43. Calculate the real-time acquired temperature change image I A and standard temperature change image I B Color similarity S(I) A ,I B ):

[0042]

[0043] In the formula, r represents a component value of R, g represents a component value of G, and b represents a component value of B.

[0044] Furthermore, the calculation of the reliability index c in S5 is as follows:

[0045] c = w1s1 + w2s2 + w3s3

[0046] In the formula, s1 is the color similarity of the first stage, w1 is the similarity weight of the first stage, s2 is the color similarity of the second stage, w2 is the similarity weight of the second stage, w3 is the color similarity of the third stage, and s3 is the similarity weight of the third stage.

[0047] Furthermore, the weight determination scheme for different stages of S5 is as follows: assign importance scales to the three stages respectively to calculate the judgment matrix, perform consistency checks on the judgment matrix, and if the consistency meets the standard, normalize the judgment matrix to obtain the weight matrix, and use the elements in the weight matrix as the weight values ​​of the three stages respectively.

[0048] In one embodiment of the present invention, multiple sub-stages within each stage are also weighted. The 0-24h stage is the heating stage, where the temperature is increased by 5°C every 3 hours from -10°C to 30°C, then decreased to -10°C, and then increased to 30°C. The total weight of a stage is calculated by assigning an importance scale to each sub-stage that increases or decreases the temperature through the weight determination scheme of S5.

[0049] Furthermore, the standard temperature change image is a temperature change image of a time-temperature indicator at a fixed temperature over a period of 0-72 hours, and the standard temperature change image includes multiple fixed temperatures.

[0050] In one embodiment of the present invention, when comparing standard temperature images at all times under the same temperature, if the temperature change scheme includes heating followed by cooling, since the color of a reliable time-temperature indicator should not change in reverse, the comparison image of the heating followed by cooling process uses the heating temperature as the standard temperature change image.

[0051] Furthermore, the time-temperature indicator is placed in a constant temperature chamber using a hollow aluminum ingot, the surface of which has grooves for holding the time-temperature indicator.

[0052] Furthermore, in one embodiment of the present invention, the temperature change process is set into three stages: heating up, cooling down, and heating up again. The initial temperature is -10°C. After 24 hours, the temperature is increased to 30°C at a rate of 5°C every 3 hours. Then, the temperature is decreased to -10°C at the same rate for another 24 hours. In the third stage, the temperature is increased to 30°C at the same rate. The standard images corresponding to each sub-stage of the first stage are images taken at different times under conditions of -10°C, 0°C, 5°C, 10°C, 20°C, and 30°C. The standard images of the second stage are compared with images taken at 30°C for 24-48 hours. The standard images of the third stage are compared with images taken at 30°C for 48-72 hours.

[0053] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0054] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for visually evaluating the reliability of a time-temperature indicator online, characterized in that, Includes the following steps: S1, Preset time-temperature indicator reliability test time-temperature variation scheme; S2. Place the time-temperature indicator in the constant temperature chamber, and adjust the temperature of the constant temperature chamber according to the preset scheme; S3. Real-time acquisition of temperature change images from the time-temperature indicator; S4. Calculate the color similarity between the real-time temperature change images at different stages and the corresponding standard temperature change images to obtain the color similarity at different stages. S5. Reliability index of weight calculation for different stages of color similarity calculation results and time-temperature change scheme. S6. Evaluate the reliability of the time-temperature indicator using reliability metrics; The highest and lowest temperatures in the time-temperature variation scheme range from -10 to 30°C, and the time is 72 hours. The time-temperature variation scheme divides the time into three stages, each stage lasting 24 hours. Each stage is further divided into multiple sub-stages, and each sub-stage lasts for the same duration. S4 specifically refers to: S41. Acquire real-time temperature change images respectively. One-dimensional normalized color histogram of R, G, and B components , , ; S42. Obtain standard temperature change images respectively. One-dimensional normalized color histogram of R, G, and B components , , ; S43. Calculate the real-time acquired temperature change image. and standard temperature change image Color similarity : In the formula, r This represents a component value of R. g This represents a component value of G. b This represents a component value of B; Reliability metrics in S5 c The calculation is as follows: In the formula, For the first stage of color similarity, The similarity weights for the first stage. For the second stage of color similarity, For the similarity weights in the second stage, For the third stage of color similarity, The similarity weights for the third stage; The weight determination scheme for different stages of S5 is as follows: assign importance scales to the three stages respectively to calculate the judgment matrix, perform consistency check on the judgment matrix, and if the consistency meets the standard, normalize the judgment matrix to obtain the weight matrix, and use the elements in the weight matrix as the weight values ​​of the three stages respectively.

2. The analytical method for visually evaluating the reliability of a time-temperature indicator online according to claim 1, characterized in that, A standard temperature change image is a temperature change image of a time-temperature indicator at a fixed temperature over a period of 0-72 hours. The standard temperature change image includes multiple fixed temperatures.

3. The analytical method for visually evaluating the reliability of a time-temperature indicator online according to claim 1, characterized in that, The time-temperature indicator is placed in a constant temperature chamber using a hollow aluminum ingot, the surface of which has grooves for holding the time-temperature indicator.

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