|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
namespace Imagecow\Crops; |
|
4
|
|
|
|
|
5
|
|
|
use Exception; |
|
6
|
|
|
use Imagick; |
|
7
|
|
|
use Imagecow\Utils\Color; |
|
8
|
|
|
|
|
9
|
|
|
/** |
|
10
|
|
|
* This class is adapted from Stig Lindqvist's great Crop library: |
|
11
|
|
|
* https://github.com/stojg/crop |
|
12
|
|
|
* Copyright (c) 2013, Stig Lindqvist. |
|
13
|
|
|
* |
|
14
|
|
|
* CropBalanced |
|
15
|
|
|
* |
|
16
|
|
|
* This class calculates the most interesting point in the image by: |
|
17
|
|
|
* |
|
18
|
|
|
* 1. Dividing the image into four equally squares |
|
19
|
|
|
* 2. Find the most energetic point per square |
|
20
|
|
|
* 3. Finding the images weighted mean interest point |
|
21
|
|
|
*/ |
|
22
|
|
|
class Balanced implements CropInterface |
|
23
|
|
|
{ |
|
24
|
|
|
/** |
|
25
|
|
|
* {@inheritdoc} |
|
26
|
|
|
*/ |
|
27
|
|
View Code Duplication |
public static function getOffsets(Imagick $original, $targetWidth, $targetHeight) |
|
28
|
|
|
{ |
|
29
|
|
|
$measureImage = clone $original; |
|
30
|
|
|
// Enhance edges with radius 1 |
|
31
|
|
|
$measureImage->edgeimage(1); |
|
32
|
|
|
// Turn image into a grayscale |
|
33
|
|
|
$measureImage->modulateImage(100, 0, 100); |
|
34
|
|
|
// Turn everything darker than this to pitch black |
|
35
|
|
|
$measureImage->blackThresholdImage('#101010'); |
|
36
|
|
|
// Get the calculated offset for cropping |
|
37
|
|
|
return static::getOffsetBalanced($measureImage, $targetWidth, $targetHeight); |
|
38
|
|
|
} |
|
39
|
|
|
|
|
40
|
|
|
/** |
|
41
|
|
|
* @param int $targetWidth |
|
42
|
|
|
* @param int $targetHeight |
|
43
|
|
|
* |
|
44
|
|
|
* @return array |
|
45
|
|
|
*/ |
|
46
|
|
|
protected static function getOffsetBalanced(Imagick $original, $targetWidth, $targetHeight) |
|
47
|
|
|
{ |
|
48
|
|
|
$size = $original->getImageGeometry(); |
|
49
|
|
|
|
|
50
|
|
|
$points = []; |
|
51
|
|
|
|
|
52
|
|
|
$halfWidth = ceil($size['width'] / 2); |
|
53
|
|
|
$halfHeight = ceil($size['height'] / 2); |
|
54
|
|
|
|
|
55
|
|
|
// First quadrant |
|
56
|
|
|
$clone = clone $original; |
|
57
|
|
|
$clone->cropimage($halfWidth, $halfHeight, 0, 0); |
|
58
|
|
|
$point = static::getHighestEnergyPoint($clone); |
|
59
|
|
|
$points[] = ['x' => $point['x'], 'y' => $point['y'], 'sum' => $point['sum']]; |
|
60
|
|
|
|
|
61
|
|
|
// Second quadrant |
|
62
|
|
|
$clone = clone $original; |
|
63
|
|
|
$clone->cropimage($halfWidth, $halfHeight, $halfWidth, 0); |
|
64
|
|
|
$point = static::getHighestEnergyPoint($clone); |
|
65
|
|
|
$points[] = ['x' => $point['x'] + $halfWidth, 'y' => $point['y'], 'sum' => $point['sum']]; |
|
66
|
|
|
|
|
67
|
|
|
// Third quadrant |
|
68
|
|
|
$clone = clone $original; |
|
69
|
|
|
$clone->cropimage($halfWidth, $halfHeight, 0, $halfHeight); |
|
70
|
|
|
$point = static::getHighestEnergyPoint($clone); |
|
71
|
|
|
$points[] = ['x' => $point['x'], 'y' => $point['y'] + $halfHeight, 'sum' => $point['sum']]; |
|
72
|
|
|
|
|
73
|
|
|
// Fourth quadrant |
|
74
|
|
|
$clone = clone $original; |
|
75
|
|
|
$clone->cropimage($halfWidth, $halfHeight, $halfWidth, $halfHeight); |
|
76
|
|
|
$point = $point = static::getHighestEnergyPoint($clone); |
|
77
|
|
|
$points[] = ['x' => $point['x'] + $halfWidth, 'y' => $point['y'] + $halfHeight, 'sum' => $point['sum']]; |
|
78
|
|
|
|
|
79
|
|
|
// get the totalt sum value so we can find out a mean center point |
|
80
|
|
|
$totalWeight = array_reduce( |
|
81
|
|
|
$points, |
|
82
|
|
|
function ($result, $array) { |
|
83
|
|
|
return $result + $array['sum']; |
|
84
|
|
|
} |
|
85
|
|
|
); |
|
86
|
|
|
|
|
87
|
|
|
$centerX = 0; |
|
88
|
|
|
$centerY = 0; |
|
89
|
|
|
|
|
90
|
|
|
// Calulate the mean weighted center x and y |
|
91
|
|
|
$totalPoints = count($points); |
|
92
|
|
|
for ($idx = 0; $idx < $totalPoints; ++$idx) { |
|
93
|
|
|
$centerX += $points[$idx]['x'] * ($points[$idx]['sum'] / $totalWeight); |
|
94
|
|
|
$centerY += $points[$idx]['y'] * ($points[$idx]['sum'] / $totalWeight); |
|
95
|
|
|
} |
|
96
|
|
|
|
|
97
|
|
|
// From the weighted center point to the topleft corner of the crop would be |
|
98
|
|
|
$topleftX = max(0, ($centerX - $targetWidth / 2)); |
|
99
|
|
|
$topleftY = max(0, ($centerY - $targetHeight / 2)); |
|
100
|
|
|
|
|
101
|
|
|
// If we don't have enough width for the crop, back up $topleftX until |
|
102
|
|
|
// we can make the image meet $targetWidth |
|
103
|
|
|
if (($topleftX + $targetWidth) > $size['width']) { |
|
104
|
|
|
$topleftX -= ($topleftX + $targetWidth) - $size['width']; |
|
105
|
|
|
} |
|
106
|
|
|
// If we don't have enough height for the crop, back up $topleftY until |
|
107
|
|
|
// we can make the image meet $targetHeight |
|
108
|
|
|
if (($topleftY + $targetHeight) > $size['height']) { |
|
109
|
|
|
$topleftY -= ($topleftY + $targetHeight) - $size['height']; |
|
110
|
|
|
} |
|
111
|
|
|
|
|
112
|
|
|
return [$topleftX, $topleftY]; |
|
113
|
|
|
} |
|
114
|
|
|
|
|
115
|
|
|
/** |
|
116
|
|
|
* By doing random sampling from the image, find the most energetic point on the passed in |
|
117
|
|
|
* image. |
|
118
|
|
|
* |
|
119
|
|
|
* @param Imagick $image |
|
120
|
|
|
* |
|
121
|
|
|
* @return array |
|
122
|
|
|
*/ |
|
123
|
|
|
protected static function getHighestEnergyPoint(Imagick $image) |
|
124
|
|
|
{ |
|
125
|
|
|
// It's more performant doing random pixel uplook via GD |
|
126
|
|
|
if (($im = imagecreatefromstring($image->getImageBlob())) === false) { |
|
127
|
|
|
throw new Exception('GD failed to create image from string'); |
|
128
|
|
|
} |
|
129
|
|
|
|
|
130
|
|
|
$size = $image->getImageGeometry(); |
|
131
|
|
|
|
|
132
|
|
|
$xcenter = 0; |
|
133
|
|
|
$ycenter = 0; |
|
134
|
|
|
$sum = 0; |
|
135
|
|
|
|
|
136
|
|
|
// Only sample 1/50 of all the pixels in the image |
|
137
|
|
|
$sampleSize = round($size['height'] * $size['width']) / 50; |
|
138
|
|
|
|
|
139
|
|
|
for ($k = 0; $k < $sampleSize; ++$k) { |
|
140
|
|
|
$i = mt_rand(0, $size['width'] - 1); |
|
141
|
|
|
$j = mt_rand(0, $size['height'] - 1); |
|
142
|
|
|
|
|
143
|
|
|
$rgb = imagecolorat($im, $i, $j); |
|
144
|
|
|
$r = ($rgb >> 16) & 0xFF; |
|
145
|
|
|
$g = ($rgb >> 8) & 0xFF; |
|
146
|
|
|
$b = $rgb & 0xFF; |
|
147
|
|
|
|
|
148
|
|
|
$val = Color::rgb2bw($r, $g, $b); |
|
149
|
|
|
$sum += $val; |
|
150
|
|
|
$xcenter += ($i + 1) * $val; |
|
151
|
|
|
$ycenter += ($j + 1) * $val; |
|
152
|
|
|
} |
|
153
|
|
|
|
|
154
|
|
|
if ($sum) { |
|
155
|
|
|
$xcenter /= $sum; |
|
156
|
|
|
$ycenter /= $sum; |
|
157
|
|
|
} |
|
158
|
|
|
|
|
159
|
|
|
$sum = $sum / round($size['height'] * $size['width']); |
|
160
|
|
|
|
|
161
|
|
|
return ['x' => $xcenter, 'y' => $ycenter, 'sum' => $sum]; |
|
162
|
|
|
} |
|
163
|
|
|
} |
|
164
|
|
|
|
oscarotero /
imagecow
