Method and apparatus for acquiring capsule seam image, storage medium and computing device

A method for acquiring a capsule seam image, the method being applied in machine vision-based detection of capsule surface defects, a capsule cap and a capsule body of a capsule having a same color at an insertion position between the capsule cap and the capsule body, the method comprising:

• acquiring a first image component, wherein the first image component comprises an image component of a capsule seam in a preset channel, and the preset channel is a brightness channel;
• in the first image component, the image component of the capsule seam in the preset channel has a step change;
• performing a highlighting process on the first image component according to an insertion direction from the capsule cap to the capsule body to obtain a second image component, wherein the second image component at least comprises an enhanced capsule seam feature;
• and
• performing noise reduction and compensation on the second image component to obtain a target image component, wherein the target image component comprises a complete outline of the capsule seam;
• wherein the noise reduction and compensation performed on the second image component comprises an adaptive thresholding process and a global thresholding process, and a filtering process and/or a morphological process.