ImagePosition

ImagePosition[image]

gives an association of image positions for each identified category of objects in image.

ImagePosition[image,obj]

gives a list of image positions for subimages identified as instances of the specified category.

ImagePosition[video,…]

gives a time series of detected object positions in frames of video.

Details and Options

  • ImagePosition attempts to find instances of an object category present in an image and returns a list of {x,y} positions.
  • Coordinates {x,y} are assumed to be in the standard image coordinate system.
  • Possible forms for category include:
  • "concept"named concept, as used in "Concept" entities
    "word"English word, as used in WordData
    wordspecword sense specification, as used in WordData
    Entity[…]any appropriate entity
    category1|category2|…any of the categoryi
  • The following options can be given:
  • AcceptanceThreshold Automaticidentification acceptance threshold
    MaxFeatures Automaticmaximum number of subimages to return
    MaxOverlapFraction Automaticmaximum bounding box overlap
    TargetDevice "CPU"the target device on which to compute
  • ImagePosition uses machine learning. Its methods, training sets and biases included therein may change and yield varied results in different versions of the Wolfram Language.
  • ImagePosition may download resources that will be stored in your local object store at $LocalBase, and can be listed using LocalObjects[] and removed using ResourceRemove.

Examples

open allclose all

Basic Examples  (1)

Find the image positions of birds in an image:

Scope  (4)

Data  (2)

Detect all objects in an image:

Highlight detected objects:

Detect instances of a specific object:

Highlight detected instances:

Detect objects in frames of video:

Highlight detected objects on the video frames:

Categories  (2)

Find all the detectable objects in an image:

Find all birds in the image:

Options  (4)

AcceptanceThreshold  (1)

Objects with low probability are not returned:

Allowing a lower probability may result in more objects being recognized:

MaxFeatures  (1)

By default, all the detected objects are returned:

Specify a maximum number of results:

MaxOverlapFraction  (1)

The detected bounding boxes may overlap each other:

Find only non-intersecting objects:

TargetDevice  (1)

By default, the function is evaluated on CPU:

Use the TargetDevice option to specify a different device:

Properties & Relations  (1)

ImagePosition is equivalent to ImageCases[image, All -> "Position"]:

Wolfram Research (2019), ImagePosition, Wolfram Language function, https://reference.wolfram.com/language/ref/ImagePosition.html (updated 2025).

Text

Wolfram Research (2019), ImagePosition, Wolfram Language function, https://reference.wolfram.com/language/ref/ImagePosition.html (updated 2025).

CMS

Wolfram Language. 2019. "ImagePosition." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2025. https://reference.wolfram.com/language/ref/ImagePosition.html.

APA

Wolfram Language. (2019). ImagePosition. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/ImagePosition.html

BibTeX

@misc{reference.wolfram_2024_imageposition, author="Wolfram Research", title="{ImagePosition}", year="2025", howpublished="\url{https://reference.wolfram.com/language/ref/ImagePosition.html}", note=[Accessed: 20-January-2025 ]}

BibLaTeX

@online{reference.wolfram_2024_imageposition, organization={Wolfram Research}, title={ImagePosition}, year={2025}, url={https://reference.wolfram.com/language/ref/ImagePosition.html}, note=[Accessed: 20-January-2025 ]}