What is upsampling?

Upsampling is a technique used in image and audio processing to increase the resolution or quality of an image or audio signal. It involves adding additional samples or pixels to the original signal in order to increase its size or improve its quality.

In image processing, upsampling is commonly used to resize images without losing quality or sharpness. This can be done through various interpolation techniques, such as bilinear or bicubic interpolation, which fill in the gaps between existing pixels to create a smoother and more detailed image.

In audio processing, upsampling is used to increase the sampling rate of a digital audio signal, leading to better sound quality and a closer representation of the original analog signal. This can also help reduce aliasing effects and improve overall audio fidelity.

While upsampling can improve the quality of an image or audio signal, it is important to note that it cannot add new information that was not present in the original signal. Therefore, the effectiveness of upsampling depends on the interpolation technique used and the specific characteristics of the original signal.