XVC Weld Camera, software

Applying Software to Your Weld Videos – Convolution Tools

David Giannotti
Written by David Giannotti on March 10, 2020

With the Xiris View Cameras, welding videos can be displayed live, and simultaneously recorded in raw or .avi format. By having a digital video of the weld process, operators are able to monitor the weld process live and make adjustments on the fly, or review the weld process offline for quality or audit processes. Sometimes, a standard view of the original video does not provide the operator with enough detail to see subtle features in the weld process that may be of interest. Dross forming in the melt pool, the solidification pattern of the cooling weld bead, or improper melting of wire or powder being fed to the process are all examples of this. In certain cases, it is interesting to apply a convolution tool to accentuate subtle greyscale differences to make some features more visible to the operator.

The Xiris Convolution Tool

Convolution is a simple mathematical operation that provides a way of `multiplying together' two arrays of numbers, typically an image with a kernel of numbers, to produce a revised image of the same size as the original image. It is a form of image processing that uses a mathematical operator to create an output image that is a linear combination of an original input image.

The convolution is performed by applying the kernel at each position of the input image and generating a new pixel at that location by mathematically combining the elements in the kernel with the neighboring pixels in the image. The result can strengthen the visibility of edges or other features that are hard to see in the original video.

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Fig.1 Original Image of Melt Pool

 

Fig. 2 Laplacian Convolution with 3 x 3 kernel

As seen above in Fig.2, a simple Laplacian convolution (a type of convolution that is very sensitive to noise) can expose some subtle details that are difficult to see in the melt pool area of the original image.

While applying a convolution tool may not be suitable for all applications of Xiris weld cameras, it can certainly expose some subtle details in the images that are hard to see in the original, raw video of a welding process and has the ability to detect special features of interest in certain situations.

 

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