What is time delay integration?

Time delay integration (TDI) is a technique used in imaging systems to improve image quality, particularly in applications such as remote sensing and astronomy. It involves taking multiple exposures of the same object or scene, but with each exposure shifted by a small amount in a particular direction, typically perpendicular to the direction of motion of the object being imaged.

The resulting images are then combined to form a final image with higher resolution than would be possible with a single exposure. This is achieved by effectively increasing the integration time of the camera, allowing more light to be captured and reducing the effects of noise and other sources of image degradation.

TDI is commonly used in satellite and aerial imaging systems to create high-resolution images of the earth’s surface. It is also used in astronomy to capture images of objects that are moving relative to the telescope, such as asteroids or comets.

One of the key benefits of TDI is that it allows for simultaneous capture of multiple spectral bands, such as infrared and visible light. This enables the creation of multi-spectral images, providing valuable information on the composition and characteristics of the object or scene being imaged.

Overall, time delay integration is a powerful imaging technique that has a wide range of applications across various fields and industries.