For example, in the mathematical function relation y=f(x), the value of the independent variable x must be within the definition domain of the function, so that the dependent variable y can have a definite value. The domain of this function is the threshold of X.
In chemical system engineering, threshold is used to calculate optimization problems. It is often unreasonable to make decisions subjectively, and it is often impossible to get the optimal value by arbitrarily determining a decision value. Therefore, the range of independent variables should be given certain mathematical restrictions in the calculation, and all points that meet these restrictions (thresholds) constitute the feasible region of the optimization problem.
The minimum input value that can produce corrective action in automatic control system.
In the aspect of project quality management in project management, the threshold is defined by parameters such as cost, time and resource value, and is a part of product specifications. Is a quality range, if it exceeds the threshold, the project management team needs to take action.
The lowest value of stress tissue response caused by stimulation. It also means critical value.
2. Explain that in photoshop, a graphic computer software, the "threshold" command converts gray or color images into black and white images with high contrast. You can specify a color scale as the threshold. All pixels brighter than the threshold are converted to white; While all pixels darker than the threshold are converted to black. The Threshold command is very useful for determining the brightest and darkest areas in an image. Threshold is often used in image binarization, and the result of binarization depends largely on the selection of threshold.
3. In earthquake engineering, the duration of a strong earthquake can be defined as the time period from the first peak point to the last peak point that exceeds a certain acceleration threshold (generally 0.05g).
4. In biometrics, the threshold refers to the preset similarity value. When the similarity between the sample and the template reaches or exceeds this value, it is a positive match, and when it is lower than this value, it is a negative match.