Method for collecting and marking mineral image under microscope

Abstract

The invention belongs to the field of mineral data acquisition, and particularly relates to a method for acquiring and labeling mineral images under a microscope, which comprises the following steps: 1) data acquisition: acquiring images of rock slices by using an orthogonal polariscope and a single polariscope; and 2) data processing: fusing the marked orthogonal polariscope and single polariscope acquisition images. According to the technical scheme provided by the invention, the original annotation information of the single polarized light image in the same vision field and the same angle and the annotation information of the orthogonal polarized light image are superposed to generate a group of new annotation information, and the group of annotation information is applied to the fused image, so that all annotations of the fused image are completed.

Description

Technical Field

[0001] The invention belongs to the field of mineral data collection, and in particular relates to a method for collecting and marking mineral images under a microscope. Background Art

[0002] In current scientific research and industrial applications, deep learning technology has become one of the key technologies in the field of image classification and recognition. In particular, in geological research, observing rock slices under a microscope to identify rock types is of great significance for understanding the composition and evolutionary history of the Earth.

[0003] Transparent minerals are divided into two categories: homogeneous and inhomogeneous, according to the different optical properties of natural substances and the presence or absence of birefringence characteristics. Under crossed polarizers, the interference colors, twinning, extinction and other characteristics of minerals can be observed, and different extinction types will appear in light extraction slices in different directions. Under a single polarizer, we can observe other optical properties of minerals, such as morphology, cleavage, color, protrusions, edges, etc. The existing data collection method under a microscope is often to collect data by rotating the stage under a single crossed polarizer or a single polarizer, and then manually annotate the data to create a data set. However, many minerals cannot be individually identified under a single polarizer or a crossed polarizer. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for collecting and annotating mineral images under a microscope.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A method for collecting and annotating mineral images under a microscope, characterized in that it includes the following steps: 1) data collection, using orthogonal polarizers and single polarizers to collect images of rock slices; 2) data processing, fusing the annotated orthogonal polarizer and single polarizer collection images.

[0007] The specific steps of step 1) are: when collecting images, the orthogonal polarizer and the single polarizer are synchronously rotated from 0° to 90° clockwise, and the rock slices are photographed every 15°. At the same time, two images under the orthogonal polarizer and the single polarizer are collected as a group of image sequences under the same field of view.

[0008] The images collected by the crossed polarizer and the single polarizer at 0°, 15°, 30°, 45°, 60°, and 75° are retained respectively, and these 12 images are renamed according to the slice number, field of view number, shooting order, and image type. These 12 images are regarded as an image sequence under the same field of view.

[0009] The specific steps of step 2) are as follows: 2.1) using labe lme to annotate the mineral information in the collected images of an image sequence under the same field of view obtained in step 1); 2.2) fusing the images collected under the orthogonal polarizer and the single polarizer at the same angle to generate a new image; 2.3) superimposing the annotation information of the original single polarizer image under the same field of view and the orthogonal polarizer image to generate a new set of annotation information, and applying this set of annotation information to the fused image to complete all the annotations of the fused image.

[0010] The specific steps of step 2.1) are as follows: load the SAM model in labe lme, use the SAM model to mark the dark minerals with clear boundaries in the image, and outline the contours of the dark minerals; when marking light-colored minerals, use a curve connected by points to outline their contours; after circling the contours of the minerals, use masks of different colors to cover them according to the type of minerals marked; and complete the marking of the category, contour, and position information of individual mineral particles.

[0011] In step 2.2), the images are fused according to the transparency of each image being 40-60%, preferably 50%.

[0012] The rock slices are monoclinic pyroxene, quartz and feldspar in the extinction position.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The technical solution of the present application fuses the images collected at the same angle under the orthogonal polarizer and the images collected under the single polarizer according to each image to generate a new image. The generated new image fuses all the features of the orthogonal polarizer and the single polarizer images, and generates new mineral image features. The features of many minerals that are not easy to identify become obvious after image fusion, making them easier to be recognized by the model. At the same time, since the position information of the mineral particles in the fused image has not changed, the previous annotation information is also applicable to the new image after fusion, and the annotation information of the single polarizer image and the orthogonal polarizer image are both applicable to the new image. The annotation information of the original single polarizer image at the same angle in the same field of view is superimposed with the annotation information of the orthogonal polarizer image to generate a new set of annotation information. This set of annotation information is applied to the fused image, and all annotations of the fused image are completed.

[0015] At the same time, in order to reduce the impact of extinction on mineral identification, images from different angles of the same field of view were collected, which reduced the difficulty of whole-image identification to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Annotate the flow chart of data collection for the present invention;

[0017] Figure 2 This is an example diagram of data collection in the present invention;

[0018] Figure 3 This is a comparison chart of automatic and manual annotations (dark minerals, light minerals) of the present invention;

[0019] Figure 4 Comparison chart of automatic and manual annotations of the present invention (feldspar);

[0020] Figure 5 The images of the extinction position clinopyroxene mineral particles of the present invention under single polarizer and cross polarizer;

[0021] Figure 6 It is a schematic diagram of the fusion of a single polarization image and an orthogonal polarization image of the present invention; DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and the best embodiments.

[0023] Figure 1 A flow chart showing a method for collecting and annotating mineral images under a microscope, comprising the following steps:

[0024] 1) Data acquisition: Use crossed polarizers and single polarizers to collect images of rock slices. In order to retain more mineral information, mineral images are collected under a 2x microscope. According to the feature that images overlap every 90° under crossed polarizers, the crossed polarizers and single polarizers are rotated synchronously from 0° to 90° clockwise during image acquisition. Rock slices are photographed every 15°. At the same time, two images under crossed polarizers and single polarizers are collected as a group of image sequences under the same field of view. The overlapping images taken at 90° are deleted. The images collected by crossed polarizers and single polarizers at 0°, 15°, 30°, 45°, 60°, and 75° are retained respectively. These 12 images are renamed according to the slice number, field of view number, shooting order, and image type. These 12 images are taken as an image sequence under the same field of view. Figure 2 Shown in.

[0025] 2) Data processing: fuse the labeled images collected by the crossed polarizer and the single polarizer.

[0026] 2.1) Use labe lme to annotate the mineral information in the image sequence obtained in the same field of view in step 1); load the SAM model in labe lme, and use the SAM model to annotate the dark minerals with clear boundaries in the image. Automatic or manual annotation can be used to outline the contours of the dark minerals ( Figure 3 When marking light-colored minerals, use a curved line connected by dots to outline them ( Figure 3 After circling the outline of the mineral, different colored masks are used to cover it according to the marked mineral type; the labeling of the category, outline and location information of individual mineral particles is completed. Figure 4 , an automatically annotated image of feldspar (left) and a manually annotated image (right).

[0027] 2.2) The image collected under the orthogonal polarizer and the image collected under the single polarizer at the same angle are fused according to the transparency of each image of 50% to generate a new image; Figure 5 As shown in;

[0028] 2.3) The annotation information of the original single polarization image under the same field of view and the same angle is superimposed with the annotation information of the orthogonal polarization image to generate a new set of annotation information. This set of annotation information is applied to the fused image, thus completing all the annotations of the fused image.

[0029] The rock thin sections described in this application can be applicable to monoclinic pyroxene, quartz and feldspar in the extinction position.

[0030] The images under the polarizing microscope are a kind of images with strong professionalism, and the collection method is multi-angle and multiple collection. The collected data has high resolution, complex information, and small mineral particles. Since each mineral image has its own unique mineral combination, it is not advisable to reduce the noise of the image during data preprocessing, and as much characteristic information as possible should be retained. Since many minerals cannot be identified individually under a single polarizer or an orthogonal polarizer, it is necessary to combine the features of two images under a single polarizer and an orthogonal polarizer to determine the type of mineral. This patent adopts a new idea, which fuses the images collected under the orthogonal polarizer and the single polarizer at the same angle according to the transparency of each image of 50% to generate a new image. The generated new image combines all the features of the orthogonal polarizer and the single polarizer images, and generates new mineral image features. The features of many minerals that are not easy to identify become obvious after image fusion. Some features have changed, and the mineral particles cannot be judged according to the original mineral identification experience. However, since the position information of the mineral particles in the fused image has not changed, the previous annotation information is also applicable to the new image after fusion, and the annotation information of the single polarization image and the orthogonal polarization image are both applicable to the new image. The annotation information of the original single polarization image at the same angle in the same field of view is superimposed with the annotation information of the orthogonal polarization image to generate a new set of annotation information. This set of annotation information is applied to the fused image, and all annotations of the fused image are completed.

[0031] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for collecting and annotating mineral images under a microscope, characterized in that: The method comprises the following steps: 1) data acquisition, using crossed polarizers and single polarizers to acquire images of rock slices; 2) data processing, fusing the labeled images acquired by the crossed polarizers and single polarizers.

2. The method for collecting and annotating mineral images under a microscope according to claim 1, characterized in that: The specific steps of step 1) are: when collecting images, the orthogonal polarizer and the single polarizer are synchronously rotated from 0° to 90° clockwise, and the rock slices are photographed every 15°. At the same time, two images under the orthogonal polarizer and the single polarizer are collected as a group of image sequences under the same field of view.

3. The method for collecting and annotating mineral images under a microscope according to claim 2, characterized in that: The images collected by the crossed polarizer and the single polarizer at 0°, 15°, 30°, 45°, 60°, and 75° are retained respectively, and these 12 images are renamed according to the slice number, field of view number, shooting order, and image type. These 12 images are regarded as an image sequence under the same field of view.

4. The method for collecting and annotating mineral images under a microscope according to claim 1, characterized in that: The specific steps of step 2) are as follows: 2.1) using labelme to label the mineral information in the collected images of an image sequence under the same field of view obtained in step 1); 2.2) Fusing the image collected at the same angle under the orthogonal polarizer and the image collected under the single polarizer to generate a new image; 2.3) The annotation information of the original single polarization image under the same field of view and the same angle is superimposed with the annotation information of the orthogonal polarization image to generate a new set of annotation information. This set of annotation information is applied to the fused image, thus completing all the annotations of the fused image.

5. The method for collecting and annotating mineral images under a microscope according to claim 1, characterized in that: In step 2.2), the images are fused according to the transparency of each image being 40-60%, preferably 50%.

6. The method for collecting and annotating mineral images under a microscope according to claim 4, characterized in that: The specific steps of step 2.1) are as follows: load the SAM model in labelme, use the SAM model to mark the dark minerals with clear boundaries in the image, and outline the contours of the dark minerals; when marking light-colored minerals, use a curve connected by points to outline their contours; after circling the contours of the minerals, use masks of different colors to cover them according to the type of minerals marked; complete the marking of the category, contour and location information of individual mineral particles.

7. The method for collecting and annotating mineral images under a microscope according to claim 1, characterized in that: The rock slices are monoclinic pyroxene, quartz and feldspar in the extinction position.

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