Rasterarithmetik

Rasterarithmetik, also known as raster arithmetic or pixel arithmetic, is a technique used in digital image processing to perform mathematical operations on individual pixels of an image. This process is fundamental in various image manipulation and analysis tasks. The primary operations in rasterarithmetik include addition, subtraction, multiplication, and division, which can be applied to the pixel values of one or more images.

One common application of rasterarithmetik is image blending, where two or more images are combined to create a new image. This can be achieved by adding or averaging the pixel values of the source images. For example, to blend two images, each pixel in the resulting image can be calculated as the average of the corresponding pixels from the two source images.

Another application is image subtraction, which is useful for detecting changes between two images taken at different times. By subtracting the pixel values of one image from another, areas of change can be highlighted. This technique is often used in remote sensing and medical imaging.

Rasterarithmetik can also be used for image enhancement, such as adjusting brightness and contrast. By adding or subtracting a constant value from each pixel, the overall brightness of the image can be altered. Similarly, multiplying or dividing pixel values by a constant can adjust the contrast.

In summary, rasterarithmetik is a versatile tool in digital image processing that enables various operations on individual pixels. Its applications range from image blending and change detection to image enhancement, making it an essential technique in fields such as remote sensing, medical imaging, and computer graphics.