Encord Computer Vision Glossary
Blurring in computer vision refers to the process of reducing the clarity or sharpness of an image or video. This is usually achieved through the use of a blur kernel, which is a small matrix of numbers that is applied to each pixel in the image. The kernel determines how much the pixel values will be averaged with those of its neighboring pixels, resulting in a blur effect.
Why is blurring used in computer vision datasets?
There are several reasons why blurring may be used in computer vision. One reason is to reduce noise or unwanted details in an image. For example, if an image has been captured under low lighting conditions, it may contain a lot of noise that can distract from the main subject. By blurring the image, the noise can be reduced and the main subject can be more easily discerned.
Another reason for blurring is to reduce the amount of data in an image or video. By blurring an image, the number of pixels and their corresponding values are reduced, resulting in a smaller file size. This can be useful when working with large images or videos that need to be processed quickly or transmitted over a limited bandwidth.
Additionally, blurring can be utilized to give an image or video a sense of depth or movement. For instance, nearby items to the camera may appear sharper, while farther distant objects may appear blurrier. The spectator may get a sense of distance and perspective from this. By applying the blur kernel to a moving object, blurring can also be utilized to provide the illusion that it is moving faster or slower than it actually is.
The Gaussian blur, the box blur, and the motion blur are just a few of the several blur kernels that can be applied in computer vision. Each of these kernels has distinctive qualities of its own and excels at particular tasks using blurring.
Finally, blurring is a standard method in computer vision that can be applied to minimize noise, reduce data, or produce the illusion of depth or movement. A blur kernel, which is applied to each pixel in the image or video, is used to achieve it. Blur kernels come in a variety of varieties, each with special qualities that can be employed.