Explain the following in the context of Computer Vision:
(i) Image Processing
(ii) Pixel
(iii) Photogrammetry
(iv) Occlusion
(v) Illumination
(vi) Video Surveillance

(i) Image Processing: Image processing involves manipulating and analyzing digital images through algorithms. The primary goal is to enhance the visual appearance or extract useful information. In computer vision, image processing techniques include filtering to reduce noise, edge detection to identify boundaries, and segmentation to divide an image into meaningful regions. These processes are fundamental for enabling computers to understand and interpret visual data effectively.

(ii) Pixel: A pixel, short for "picture element," is the smallest unit of a digital image. Each pixel represents a single point in the image and has specific color and intensity values. In grayscale images, pixels have a ________ _________ ______ ___ __________ __________ ____.
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