When it comes to thermal image quality, resolution plays a very important role. Here are some key points related to resolution in infrared cameras:

1. Pixel Resolution:

•  Infrared cameras come in different resolutions, typically categorized as
  low, medium, and high:

• Low Resolution: ≤ 160×120 (19,600 pixels)
• Medium Resolution: 320×240 (76,800 pixels)
• High Resolution: 640×480 (307,200 pixels)

• The choice of resolution depends on your application and the
  importance you place on image quality.
• Higher resolution provides better image detail and allows for zooming
  without sacrificing quality.

2. Object Distance and Spot Size:

• The spot size detected by an infrared camera depends on both the
  camera’s resolution and the distance from the target.
• The formula for spot size is:
  
• Distance: How far you are from the object.
• IFOV (Instantaneous Field of View): The spatial resolution
  value of your thermal imager in radians.

3. IFOV (Instantaneous Field of View)

•  IFOV represents the angular size of a single pixel in your infrared
  camera’s detector array.
• It defines the smallest angle over which your camera can resolve
  temperature differences.
• To calculate IFOV, use the following formula:

•  FOV: The total angular field of view covered by the camera.
• Number of Pixels: The total number of pixels in the camera’s array.

• IFOV determines how finely your camera samples the scene.
• Smaller IFOV values mean higher spatial resolution (finer detail) but
  may require closer proximity to the object.
• Larger IFOV values sacrifice detail for wider coverage.

4. Zoom Capability:

• High-resolution cameras allow you to zoom into scenes while
  maintaining image quality.