public static function imageDenoise(&$image, $sizeX, $sizeY)
{
// 初始化
self::$image = $image;
self::$visit = array_fill(0, 120, array_fill(0, 60, FALSE));
self::$denoised = self::$visit;
self::$sizeX = $sizeX;
self::$sizeY = $sizeY;
// 去噪
for ($x = 0; $x < $sizeX; $x++) {
for ($y = 0; $y < $sizeY; $y++) {
if (!self::$visit[$x][$y] && self::$image[$x][$y] != 255) {
$size = self::getBlockSize($x, $y, 0);
// 求块大小
if ($size < 10) {
// 根据块大小判断噪点簇
self::deletePixel($x, $y);
}
}
}
}
return self::$image;
}
/**
* 处理图片 去噪 二值化
* @param string $fileName 验证码图片路径
* @return array 四个字符的二进制矩阵
*/
function processImage($fileName)
{
$backgroundColor = array(212, 218, 219, 252, 209, 216);
$sizeX = 120;
$sizeY = 60;
$res = imagecreatefromgif($fileName);
$this->res = $res;
$image = array();
// 读颜色 去背景色
for ($x = 0; $x < $sizeX; $x++) {
for ($y = 0; $y < $sizeY; $y++) {
$colorIndex = imagecolorat($res, $x, $y);
$image[$x][$y] = $colorIndex;
if (in_array($colorIndex, $backgroundColor)) {
$image[$x][$y] = 255;
}
}
}
// 去噪点
$image = Denoise::imageDenoise($image, $sizeX, $sizeY);
$columnPx = array();
// 某列像素个数
$charCol = array();
// 字符的开始列和结束列
$charFound = 0;
// 当前正在查找的字符
$finding = FALSE;
// 扫描状态
// 从左向右扫描 字符左右位置
for ($x = 0; $x < $sizeX; $x++) {
$columnPx[$x] = 0;
for ($y = 0; $y < $sizeY; $y++) {
if ($image[$x][$y] != 255) {
$columnPx[$x]++;
}
}
// 如果正在扫描字符，此列没有出现点则结束正在扫描状态，
// 记录结束列。如果不是在扫描状态，如果出现点，则记录
// 字符开始列并转换状态。
if ($finding) {
if ($columnPx[$x] == 0) {
$finding = FALSE;
$charCol[$charFound++][1] = $x;
}
} elseif ($columnPx[$x] > 0) {
$finding = TRUE;
$charCol[$charFound][0] = $x;
}
}
// 是否有粘连
if (count($charCol) < 4) {
for ($charNum = 0; $charNum < 4; $charNum++) {
if ($charCol[$charNum][1] - $charCol[$charNum][0] > 30) {
// 字符宽大于30则分裂
for ($col = 3; $col > $charNum; $col--) {
if (isset($charCol[$col - 1])) {
$charCol[$col] = $charCol[$col - 1];
} else {
$charCol[$col] = array();
}
}
// 按照颜色分割字符
$avgWidth = ceil(($charCol[$charNum][0] + $charCol[$charNum][1]) / 2);
$divide = false;
for ($col = $avgWidth - 5; $col < $avgWidth + 5; $col++) {
$color1 = $this->averageRGB($image[$col]);
$color2 = $this->averageRGB($image[$col + 1]);
// 色差大于100则不同字符
if ($this->colorDistance($color1, $color2) > 100) {
$charCol[$charNum + 1][0] = $col + 1;
$charCol[$charNum][1] = $col + 1;
$divide = true;
break;
}
}
// 还没被分割则直接对半分
if (!$divide) {
$charCol[$charNum + 1][0] = $avgWidth;
$charCol[$charNum][1] = $avgWidth;
}
}
}
}
$charRow = array();
// 从上到下扫描 字符上下位置
for ($charNum = 0; $charNum < 4; $charNum++) {
$charRow[$charNum] = array(-1, -1);
for ($y = 0; $y < $sizeY; $y++) {
for ($x = $charCol[$charNum][0]; $x < $charCol[$charNum][1]; $x++) {
if ($image[$x][$y] != 255) {
// 如果此行有点，上界没有值则存上界，已经有值则存下界
if ($charRow[$charNum][0] == -1) {
$charRow[$charNum][0] = $y;
} else {
$charRow[$charNum][1] = $y;
}
break;
}
}
}
$charRow[$charNum][1]++;
// 下界多加1，为与右界保持一致都是多1
}
// 二值化
for ($x = 0; $x < $sizeX; $x++) {
for ($y = 0; $y < $sizeY; $y++) {
if ($image[$x][$y] == 255) {
$image[$x][$y] = 0;
} else {
$image[$x][$y] = 1;
}
}
}
// 取出四个字符
$char = array_fill(0, 4, array_fill(0, 625, 0));
for ($charNum = 0; $charNum < 4; $charNum++) {
$height = $charRow[$charNum][1] - $charRow[$charNum][0];
$width = $charCol[$charNum][1] - $charCol[$charNum][0];
// 最大尺寸25x25
if ($height > 25) {
$charRow[$charNum][1] = $charRow[$charNum][0] + 25;
}
if ($width > 25) {
$charCol[$charNum][1] = $charCol[$charNum][0] + 25;
}
for ($y = 0; $y < $height; $y++) {
for ($x = 0; $x < $width; $x++) {
$char[$charNum][$y * 25 + $x] = $image[$x + $charCol[$charNum][0]][$y + $charRow[$charNum][0]];
}
}
}
return $char;
}
