Patent ID: 11971363
Assignee: NIPRO CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 6:
7. A foreign matter inspection method for inspecting whether a foreign matter is present inside a bag-like container in which a powder is sealed and which has an area where the powder is visible from an outside, the method comprising:
alternately applying a weak vibration and a strong vibration being a vibration stronger than the weak vibration to the container;
photographing an image including the area of the container to acquire image data when the weak vibration is applied;
grouping the acquired image data according to sub-areas of the area;
for each sub-area determining a peak color density value, an intensity volume value, and an intensity area value; and
determining whether the foreign matter is present inside the container based on the acquired image data, wherein said determining whether foreign matter is present determines that foreign matter is present when there is a continuous range for which each one of the peak color density value, intensity volume value, and intensity area value are at least as great as a respective threshold.