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Adapted from Wikipedia ยท Discoverer experience

A view of future train tracks between Munich and Berlin, captured with a mobile phone near Essleben in Germany.

An image or picture is a visual representation. It can be something flat, like a drawing, painting, or photograph, or something that has depth, like a carving or sculpture. Images can appear in many ways, such as being shown on a screen, projected onto a wall, or printed on paper.

The act of making a 2D image with a mobile phone camera. The display of the phone shows the photograph that will be made and stored.

In science, an image can mean the way light shows us an object, like when we look through a telescope or use a camera. Some images only last a short time, like what you see in a mirror or on a screen, while others are fixed, like a photo you can hold.

We also think about images in our minds, such as remembering a friend's face or imagining a magical place. To share these mental pictures with others, we use words or create things like drawings or stories.

Characteristics

An image is a way to show something visually. It can be flat, like a map, painting, or banner, or it can be made by hand through drawing or graphic arts. Images can also be created using machines like computers or printers.

A synthetic aperture radar image acquired by the SIR-C/X-SAR radar on board the Space Shuttle Endeavour shows the Teide volcano. The city of Santa Cruz de Tenerife is visible as the purple and white area on the lower right edge of the island. Lava flows at the summit crater appear in shades of green and brown, while vegetation zones appear as areas of purple, green, and yellow on the volcano's flanks.

Some special tools help us see things that are too small or far away, like microscopy for tiny objects or telescopes for distant stars. There are also ways to see inside the body using X-rays or magnetic resonance imaging (MRI).

Images can also be three-dimensional, like sculptures, or made to look three-dimensional using special technology such as holography. Moving images, like those in movies or on television, are made by showing many still pictures very quickly, tricking our eyes into seeing motion.

bebof, we see the first equation: y = f(x) = 0.5x + 1.5.

We will later use this equation to calculate the total number of new cases per day, given the total number of new cases from the previous day.

The second equation is the logistic equation. This equation is a bit more complex and is given by:

y = c + \frac{a}{1uy + b}

where:

  • y is the value of the output variable
  • x is the value of the input variable
  • c is a constant
  • a is a constant
  • b is a constant
  • u is a parameter that controls the shape of the curve

The parameters of the logistic equation can be found by fitting the equation to the data. In the code, we will use the curve_fit function from the SciPy package to fit the parameters a, b, and u.

The logistic equation is a common model for population growth and is often used to model the spread of diseases. It is a good model for the spread of COVID-19 because it is a bounded growth model, meaning that the number of new cases per day cannot grow indefinitely.

Other considerations

2D pencil drawing image

Images can be still or moving. A still image is a single picture, like a photograph or a drawing, that does not change. Moving images are things like movies or videos that change over time. In books and stories, writers use words to help us picture things in our minds, creating mental images.

Related articles

This article is a child-friendly adaptation of the Wikipedia article on Image, available under CC BY-SA 4.0.

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