Sysquake Pro – Table of Contents
Sysquake for LaTeX – Table of Contents
Extension - Image Capture
This section describes functions related to the image capture capabilities of macOS, i.e. system software which supports the acquisition of images on a digital camera, a scanner, or similar devices.
Most capabilities of image capture are made available as a tree of nodes, each node having children, properties, or both. Function ic_root creates an opaque object for the root node. Children nodes are retrieved from the root node using the index notation (an integer between parenthesis); node properties are retrieved with the field access notation (a dot followed by the property name).
Functions
ic_capture
Capture a new image.
Syntax
ic_capture(cam)
Description
ic_capture(cam) captures a new image with camera cam.
Example
Captures a new image with the first camera connected:
root = ic_root; cam = root(1); ic_capture(cam);
See also
ic_delete_one
Delete one image.
Syntax
ic_delete_one(im)
Description
ic_delete_one(im) deletes image im stored on the camera.
Example
Deletes the first image of the first camera connected (the depth depends on the file directory in the memory card of the camera):
root = ic_root; cam = root(1); im = cam(1)(1)(1)(1); ic_delete_one(im);
See also
ic_delete_all
Delete all images.
Syntax
ic_delete_all(cam)
Description
ic_delete_all(cam) deletes all images stored on camera cam.
Example
Deletes all images of the first camera connected:
root = ic_root; cam = root(1); ic_delete_all(cam);
See also
ic_root, ic_capture, ic_delete_one
ic_root
Get the root node of the image capture tree.
Syntax
r = ic_root
Description
ic_root gives the root node of the image capture tree. All other nodes are linked to the root node and can be accessed using the index notation. The tree is updated automatically by the system when devices are connected or disconnected.
Properties, which are accessed like the fields of a structure with the dot notation, are listed in the developer documentation of the Image Capture framework available from Apple Computer, Inc. In addition, the number of children nodes is given by the length field or the length function; the parent node is given by the parent field; and all the properties except for data can be obtained as a structure with the properties field.
The other functions which are overloaded for nodes are listed below.
| Function | Description |
|---|---|
| disp | display the kind of node |
| fieldnames | get the list of property names |
| subsref | implement the subnode and property access |
Examples
Get the root node and store it into root:
root = ic_root Image capture object (device)
Get the number of children (the result will depend on the actual device(s) connected to your computer):
root.length 1
Get the first (and unique) child:
root(1) Image capture object (camera)
Get a list of its property names:
fieldnames(root(1))
{'volumeLabel','cameraIcon'}
Get all its properties as a structure:
root(1).properties volumeLabel: 'NIKON DSC E775' cameraIcon: 9229x1 uint8 array
Get the properties of its first image (without data):
root(1)(1)(1)(1).properties filename: 'DSCN0798.JPG' imageThumbnail: 65549x1 uint8 array imageSize: 370946uint32 imageWidth: 1600uint32 imageHeight: 1200uint32
Get the data of the first image:
d = root(1)(1)(1)(1).data;
Decode image with the function imageread of the Image IO extension:
im = imageread(d);
ic_sync_clock
Synchronize camera clock.
Syntax
ic_sync_clock(cam)
Description
ic_sync_clock(cam) synchronizes the clock of camera cam.