How Panoramic Images Are Captured
Mars rovers like Curiosity and Perseverance create panoramic images by rotating their camera mast and taking multiple overlapping photographs of the landscape. Each photo captures a narrow section of the view, similar to how a person might turn their head side to side while taking pictures. The rover can take dozens of individual images that overlap with their neighbors, creating raw material for assembly into one large panorama.
Image Processing and Stitching
Once the individual photos are captured, specialized computer software analyzes the overlapping sections and automatically aligns and blends the images together into a single panoramic photograph. This process is called image stitching. The software compensates for lighting changes, dust on the camera lens, and slight movements of the rover between photos. Scientists can process the images either on the rover itself or later on Earth for the highest quality results.
Data Compression
Panoramic images produce enormous amounts of data because they contain millions of individual pixels. Before transmission, the images must be compressed using special algorithms that reduce file size while keeping the image quality as high as possible. Scientists choose compression levels carefully to balance image detail against the limited amount of data that can be sent through space.
Transmission to Earth
The rover cannot send data directly to Earth because of the distance and the curvature of Mars. Instead, the compressed image data is transmitted via radio signals to spacecraft orbiting Mars, such as NASA's Mars Reconnaissance Orbiter. These orbital relay stations receive the data and then transmit it to Earth-based receiving stations. The entire process from Mars surface to Earth takes several minutes because radio signals travel at the speed of light.
Challenges and Limitations
Mars rovers face several technical challenges when capturing and sending panoramic images. The rovers have limited power from their solar panels or nuclear batteries, so they must balance image collection against other mission tasks. Communication windows occur only at certain times when Earth and Mars are properly aligned. Additionally, dust storms on Mars can obscure the camera lens and reduce image quality. 
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