The Imagick::segmentImage() function is an inbuilt function in PHP which is used to segment an image.
Syntax:
bool Imagick::segmentImage(int $COLORSPACE, float $cluster_threshold, float $smooth_threshold, bool $verbose = FALSE )
Parameters: This function accepts four parameters as mentioned above and described below:
- $COLORSPACE: It specifies the integer value corresponding to one of COLORSPACE constants. You can also pass direct constants like imagick::COLORSPACE_RGB.
- $cluster_threshold: It specifies a percentage describing minimum number of pixels contained in hexedra before it is considered valid.
- $smooth_threshold: It specifies whether to eliminate noise from the histogram.
- $verbose (Optional): It specifies whether to output detailed information about recognized classes. Default value is false
List of all COLORSPACE constants are given below:
- imagick::COLORSPACE_UNDEFINED (0)
- imagick::COLORSPACE_RGB (1)
- imagick::COLORSPACE_GRAY (2)
- imagick::COLORSPACE_TRANSPARENT (3)
- imagick::COLORSPACE_OHTA (4)
- imagick::COLORSPACE_LAB (5)
- imagick::COLORSPACE_XYZ (6)
- imagick::COLORSPACE_YCBCR (7)
- imagick::COLORSPACE_YCC (8)
- imagick::COLORSPACE_YIQ (9)
- imagick::COLORSPACE_YPBPR (10)
- imagick::COLORSPACE_YUV (11)
- imagick::COLORSPACE_CMYK (12)
- imagick::COLORSPACE_SRGB (13)
- imagick::COLORSPACE_HSB (14)
- imagick::COLORSPACE_HSL (15)
- imagick::COLORSPACE_HWB (16)
- imagick::COLORSPACE_REC601LUMA (17)
- imagick::COLORSPACE_REC709LUMA (19)
- imagick::COLORSPACE_LOG (21)
- imagick::COLORSPACE_CMY (22)
Return Value: This function returns TRUE on success.
Exceptions: This function throws ImagickException on error.
Below given programs illustrate the Imagick::segmentImage() function in PHP:
Program 1:
<?php   // Create a new imagick object $imagick = new Imagick(   // Segment the image with colorspace as imagick::COLORSPACE_RGB $imagick->segmentImage(1, 0, 12);   // Display the image header("Content-Type: image/png"); echo $imagick->getImageBlob(); ?> |
Output:
Program 2:
<?php   // Create a new imagick object $imagick = new Imagick(   // Segment the image with colorspace as imagick::COLORSPACE_GRAY $imagick->segmentImage(2, 5, 30);   // Display the image header("Content-Type: image/png"); echo $imagick->getImageBlob(); ?> |
Output:
Reference: https://www.php.net/manual/en/imagick.segmentimage.php
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