Wolfram Language & System 10.3 (2015)|Legacy Documentation

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evaluates f applied to each pixel of image in turn.

Details and OptionsDetails and Options

  • The channel values supplied to f are normally in the range 0 to 1, regardless of the underlying type used in the Image object.
  • ImageScan[f,image] discards the results of applying f to the pixels in image. Unlike ImageApply, ImageScan does not build up a new image and returns Null.
  • ImageScan is useful in carrying out an operation on parts of expressions where the operation has a "side effect", such as making an assignment.
  • ImageScan works on images with any number of channels.
  • You can also use Throw to exit from ImageScan. »
  • ImageScan traverses the pixels of image in a row-wise order from left to right.
  • ImageScan has the option Interleaving, which specifies whether f should be applied to individual channel values or to the complete list of channel values for a given pixel. The default setting is Interleaving->True.
  • With the setting Masking->roi, a region of interest to be scanned can be specified.
  • ImageScan works with Image3D objects.

ExamplesExamplesopen allclose all

Basic Examples  (5)Basic Examples  (5)

Scan pixels of a grayscale image:

Scan pixels of a color image:

Scan pixels of a 3D image:

Count the number of white pixels in an image:

Click for copyable input
Click for copyable input

Compute the mean pixel value:

Click for copyable input
Click for copyable input
Introduced in 2012