Thread-like cut stem form detection method and evaluation method

Abstract

The invention provides a thread-like cut stem form detection method. The method comprises the following steps: placing a plurality of cut stems in a cut stem material to be detected on a detection platform one by one; photographing the cut stems on the detection platform to obtain digital images of the cut stems; processing the digital images of the cut stems through a computer to obtain projected images of the cut stems; calculating the area S of the projected image of each cut stem, and determining the maximal length X of the cut stems in the projected images of the cut stems; obtaining a convex hull of each projected image of each cut stem, calculating the circumference C of each convex hull, cut stem fiber length L and cut stem mean width W; and presenting cut stem threadiness degree R to be R=W. The difference value between the circumference of the convex hull of the each projected image of the cut stem and the maximal length as the cut stem fiber length L, and the cut stem fiber length L can better represent the actual length of each cut stem in nature bent state, and therefore, it is more direct and accurate to use the calculated cut stem mean width W to represent the threadiness degree of each cut stem.

Description

technical field [0001] The invention relates to the field of tobacco processing, in particular to a detection method and evaluation method for the shape of filamentous cut stems. Background technique [0002] Cut stems are commonly used blends in cigarette formulas. They have the advantages of low price, high filling performance, and low release of tar and harmful components. At the same time, they also have poor compatibility with shredded leaves, heavy woody smell after burning, and strong burning sensation. etc. defects, therefore, cut stems are widely used in low-grade cigarettes at present, and the consumption is relatively large, and the consumption of cut stems in middle-grade cigarettes is less, and cut stems are basically not used in high-grade cigarettes. In addition, with the development of product structure in China's cigarette market, the output of low-grade cigarettes has shrunk rapidly, resulting in a great waste of China's tobacco stem resources. [0003] Du...

AI Technical Summary

Problems solved by technology

This method has a certain effect on the morphological characterization of some regular and linear cut stems. However, among the "filamentous" cut stems used in actual testing and actual tobacco production, most of the cut stems are irregular. And the state of natural bending, such as figure 1 As shown, therefore, in the detection and quantitative characterization method of cut tobacco stem shape, "determine the farthest distance between two edge pixel points as the length of the cut stem" cannot be used for cut cut stems, because curved cut cut stems In the image, the farthest distance L1 between two edge pixels is not equal to the actual length L2+L3 of the cut stems. Therefore, the above-mentioned detection and quantitative characterization method for cut tobacco stems is not suitable for naturally curved tobacco stems in actual production. Morphological characterization of "filamentous" cut stems

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