It is a tool or technique and a process of making an image. This is done in order to advance the way you see and understand things. In earlier days, visualization has been used as a mode of communication. Moreover, in earlier times as writing and language were not that established or modern, hieroglyphics was used instead to communicate. Be aware that hieroglyphics is a good example of visualization. Prominent examples of visualization are paintings, cave drawings and sketches. Furthermore, it was previously used to maintain historical records so that people might see them in the near future.
Image processing is a technique done by signal processing. Image processing normally relates to the process which creates a picture in order for the image to be seen clearly. Generally when you say image processing, it relates to digital processing by making use and seeking assistance of high technology gadgets. Nevertheless, it is important to understand that analog and optical techniques might also be performed in order to process a picture. Remember that image processing indulges in the use of signals to cause an image. A couple of examples of it are video frames and photographs. Also, image processing treats the image to improve the overall quality.