Method for detecting at least one defect on a support, device and computer program associated

A device for detecting at least one defect on a fabric, said device comprising:

• at least one camera for acquiring at least one first image of the support and for detecting at least one margin information and one dimension of the fabric;
• a calculator for:
• generating an image that corresponds to a first two-dimensional spectrum space of the at least one first image;
• filtering at least one frequency range of the first two-dimensional spectrum space to remove at least one predefined pattern of the support;
• selecting at least one first frequency range on the first two-dimensional spectrum space;
• shifting the selected first frequency range from at least a first area of the first two-dimensional spectrum space toward a second area of the first two-dimensional spectrum space;
• resizing the first two-dimensional spectrum space by applying at least one step among the following steps:
• downscaling or cropping the first image to output a desired downscaled image or;
• upscaling or enlarging the first image with a margin or padding to output a desired enlarged image;
• generating a second two-dimensional spectrum space on a second frequency range;
• selecting a third frequency range in the second two-dimensional spectrum space;
• shifting the selected frequency range from a second area of the second two-dimensional spectrum space toward a first area of the second two-dimensional spectrum space;
• reversing the transformation of the frequency domain of the second two-dimensional spectrum space to obtain a final image;
• detecting at least one defect on the final image;
• labelling each defect on the first image, said labelling being applied at pixel precision, and
• generating at least one command after detecting the at least one defect;
• at least one communication interface for exchanging data with a local equipment, a distant equipment or a server.

A non-transitory computer readable medium comprising instructions which, when said is instructions are executed on a computer, leads it to execute the following steps:

• generating an image that corresponds to a first two-dimensional spectrum space of the at least one first image;
• filtering at least one frequency range of the first two-dimensional spectrum space to remove at least one predefined pattern of the support;
• selecting at least one first frequency range in the first two-dimensional spectrum space;
• shifting at least one selected first frequency range from at least a first area of the first two-dimensional spectrum space toward a second area of the first two-dimensional spectrum space;
• resizing the first two-dimensional spectrum space by applying at least one step among the following steps:
• downscaling or cropping the first image to output a desired downscaled image or;
• upscaling or enlarging the first image with a margin or padding to output a desired enlarged image;
• generating a second two-dimensional spectrum space on a second frequency range;
• selecting at least one third frequency range in the second frequency range;
• shifting the third frequency range from a second area of the second two-dimensional spectrum space toward a first area of the second two-dimensional spectrum space, and
• reversing the transformation of the frequency domain of the second two-dimensional spectrum space to obtain a final image.