CN102759527A - Method for detecting alkali digestion degree of rice - Google Patents

Abstract

The invention discloses a method for detecting alkali depletion of rice, comprising: firstly, making a background filter paper for obtaining an image of rice grains; then, measuring the alkali depletion of rice grains, and obtaining a sample image; then, using an image processing method to obtain the image area of rice grains; Next, the alkali passivity of rice was obtained from the image area. This detection method can objectively characterize the alkali digestion of rice after obtaining the rice picture.

Description

A kind of method of detecting rice alkali digestion

technical field

The invention relates to a method for detecting alkali depletion of rice, which is a detection method based on computer image recognition and belongs to the technical field of computer image processing.

technical background

Alkaline digestion is a simple, rapid and accurate method for indirect determination of rice gelatinization temperature. Alkaline digestion is mainly determined by the resistance of rice grains to alkali, and is also related to the alkalinity and density of rice tissue. Alkaline digestion is generally classified by manual visual inspection to judge the degree of spallation and clarity of rice grains. The degree of spallation mainly reflects the characteristics of rice grains such as swelling and dissipating in alkaline solution. Clarity is mainly based on the chalky state of rice grains and changes in flocculent substances after soaking in alkaline solution. The judgment of these methods is mainly based on people's subjective judgment, which is not conducive to objectively reflecting the alkali depletion status of rice.

Contents of the invention

In order to solve the problem of objective and quantitative detection of rice alkali digestion, the present invention proposes a method for objectively detecting rice alkali digestion using image processing technology.

The method for detecting alkali digestion of the present invention comprises the following steps:

Step 1, making the background filter paper for obtaining the image of rice grains;

Step 2: Measuring the alkali digestion of rice grains, and obtaining the image of the sample;

Step 3, using the image processing method to obtain the area of the rice grain image;

Step 4: Obtain the alkali passivity of rice from the area of the image.

In the method for detecting alkali digestion as described above, in the first step, the image background during the measurement of alkali digestion is made, the filter paper is cut into a circular filter paper with a diameter of 55mm, and it is dyed black with black ink.

In the method for detecting alkali digestion as described above, in the second step, the black filter paper is placed in a petri dish with an inner diameter of 55 mm to measure the alkali digestion. Use the scanner to obtain the initial rice grain picture and the rice grain picture after potassium hydroxide soaking respectively, and save the picture.

In the method for detecting alkali digestion as described above, image processing software is used to perform image preprocessing on the initial rice grain picture and the rice grain picture soaked in potassium hydroxide in the step 3, to obtain the processed rice grain picture, and to calculate the area of the rice grain image .

In the above-mentioned method for detecting alkali digestion, in step 4, the area of rice grains soaked in potassium hydroxide is divided by the area of the initial rice grain image, so as to reflect the alkali digestion of rice.

The method proposed by the present invention obtains the initial rice grain picture and the rice grain picture after soaking in potassium hydroxide by using black as the background, utilizes the principle that rice grain image areas are different after soaking in an alkali solution, and calculates the rice grain image area after soaking in an alkali solution Divide by the ratio of the initial image area to determine its alkali passivity. The method uses a scanner to obtain pictures of rice grains during sample detection, replacing the traditional method of grading based on human subjective judgment, which can objectively evaluate the difference in alkali passivity and reduce subjective randomness; moreover, multiple samples can be detected at one time.

Detailed ways

The method of the present invention will be described below through specific examples.

The detailed steps of the method described in the embodiment of the present invention are as follows:

First, cut the filter paper into a circular filter paper with a diameter of 55mm, and put it in black ink for 12h. Then remove the filter paper and let it dry in a cool environment. Soak the filter paper several times with distilled water until no black color appears in the water. Dry the black filter paper.

Then, the above-mentioned black filter paper was placed in a petri dish with an inner diameter of 55 mm, and 7 grains of rice with a processing precision of second grade were equidistantly distributed in the petri dish in a radial direction, and injected with 10 mL of potassium hydroxide solution (1.7 g/100 mL for indica rice, 1.4 g/100 mL for japonica rice). g/100mL). The scanner has scanned the rice grain RGB picture with a resolution of 300dpi and saved the picture. Cover the petri dish and let it stand at constant room temperature (25°C) for 23h. The scanner obtains the RGB picture of rice grains after soaking and saves the picture.

Next, use the image processing software to convert the initial rice grain picture and the rice grain picture soaked in potassium hydroxide for 23 hours according to gray=0.2989×R+0.5870×G+0.1140×B grayscale conversion, and use the filter of [3,3] Value filtering, using the segmentation threshold determined by the Ostu adaptive threshold for binarization processing, and performing morphological opening operations on the binary image with a circular structural element with a radius of 2, to obtain the processed binary image of rice grains, through the binary image Calculate the initial rice grain picture and the 7-grain image area sum of the rice grain picture after soaking for 23 hours.

Next, use the ratio obtained by dividing the area of rice grains after soaking for 23 hours by the area of the initial image of rice grains to judge its alkali digestion (grade 1-7), of which grade 1 is 1.0-1.4, grade 2 is 1.4-2.0, grade 3 is 2.0- 2.6, 2.8-3.4 for grade 4, 3.4-4.0 for grade 5, 4.0-5.0 for grade 6, and above 5.0 for grade 7.

Finally, it should be noted that the above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be modified Or an equivalent replacement, any modification or partial replacement without departing from the spirit and scope of the present invention shall fall within the scope of the claims of the present invention.

Claims (5)

1. method that detects rice alkali degree of disappearing may further comprise the steps:

Grain of rice image background filter paper is obtained in step 1, making;

Step 2, grain of rice alkali degree of disappearing are measured, and are obtained sample image;

Step 3, utilize image processing method to obtain grain of rice image area;

Step 4, obtain rice alkali degree of disappearing by image area.

2. the method for detection alkali degree of disappearing according to claim 1; It is characterized in that: make image background in alkali degree of the disappearing mensuration process in the described step 1; It is diameter 55mm circular filter paper (confirming according to double dish internal diameter and the used grain of inspection number) that filter paper is cut, and the use black ink is dyed black with it.

3. the method for detection alkali degree of disappearing according to claim 1 is characterized in that: in the described step 2 black filter paper being placed internal diameter is that diameter 55mm double dish is measured alkali degree of disappearing.Use scanner to obtain initial grain of rice picture and potassium hydroxide immersion back grain of rice picture respectively, preserve picture.

4. the method for detection alkali degree of disappearing according to claim 1; It is characterized in that: use image processing software respectively initial grain of rice picture and potassium hydroxide immersion back grain of rice picture to be carried out the image pre-service in the described step 3; Grain of rice picture after obtaining handling calculates grain of rice image area.

5. the method for detection alkali degree of disappearing according to claim 1 is characterized in that: described step 4, potassium hydroxide is soaked back grain of rice area divided by initial grain of rice image area, and characterize rice alkali degree of disappearing with this.