Method for identifying propagation of different types of cracks of stratified shale based on digital image

The invention discloses a method for identifying propagation of different types of cracks of stratified shale based on digital images, and relates to the field of oil-gas exploration and development of stratified shale. The method comprises the following steps: firstly, sampling on site, further performing manifestation treatment on sample characteristics, extracting lamina type characteristics by utilizing a two-dimensional convolution model, selecting lamina-shaped shale meeting conditions, performing speckle manufacturing on the lamina-shaped shale, then performing a mechanical experiment, simultaneously performing digital image acquisition, capturing a synchronous image by using a high-speed camera, and finally performing data processing on the lamina-shaped shale. And analyzing the acquired image data and a series of experimental data obtained by a mechanical test experiment, adopting a reliability-oriented initial value transfer strategy algorithm in the region of interest to obtain visual displacement