PHP imagick像素迭代器比较下一个和上一个像素 - php imagick pixel iterator compare to next and previous pixels

php imagick pixel iterator compare to next and previous pixels

$imagick = new 'Imagick(realpath($imagePath));
$imageIterator = $imagick->getPixelIterator();
foreach ($imageIterator as $row => $pixels) { /* Loop through pixel rows */
    foreach ($pixels as $column => $pixel) { 
         if ($column % 2) {

我如何将这个像素与上面和下面以及左边和右边的像素进行比较，我将使用isSimilar，我已经理解

getNextIteratorRow/getPreviousIteratorRow也许吗?它们在像素上是相似的吗?

}
    }
    $imageIterator->syncIterator(); 
}

这就是我如何从当前像素导航到上、下、左、右像素的问题。

感谢您的帮助。

这是其中一个问题，可能最好通过编写一些代码来解决。

function processPixel($pixeLeft, $pixelMiddle, $pixelRight, $pixelAbove, $rowBelow)
{
    //Whatever it is you're doing.
}
function processRow($rowAbove, $rowMiddle, $rowBelow)
{
    for ($x = 0; $x < count($pixels); $x++) {
        $pixelAbove = null;
        $pixelBelow = null;
        $pixeLeft = null;
        $pixelRight = null;
        $pixelMiddle = $pixels[0];
        if (($x - 1) >= 0) {
            $pixelLeft = $pixels[$x - 1];
        }
        if (($x + 1) < count($pixels)) {
            $pixelRight = $pixels[$x + 1];
        }
        if ($rowAbove != null) {
            $pixelAbove = $rowAbove[$x];
        }
        if ($rowBelow != null) {
            $rowBelow = $rowBelow[$x];
        }
        processPixel($pixeLeft, $pixelMiddle, $pixelRight, $pixelAbove, $rowBelow)
    }
}
function processImageIterator($imageIterator)
{
    $rowAbove = null;
    $rowMiddle = null;
    $rowBelow = null;
    foreach ($imageIterator as $rowPixels) {
        $rowBelow = $rowPixels;
        foreach ($imageIterator as $rowPixels) {
            processRow($rowAbove, $rowMiddle, $rowBelow);
        }
        $rowAbove = $rowMiddle;
        $rowMiddle = $rowBelow;
    }
    // Finish last row with middle on the last row
    processRow($rowAbove, $rowMiddle, null);
    //Finish row of pixel below last row. This may not be necessary
    //depending on your algorithm,
    $rowAbove = $rowMiddle;
    processRow($rowAbove, null, null);
}

需要注意的是，这将是非高性能的，也就是非常慢。它可能(但不能保证)更快地实现它是你试图做一个外汇运营商。此处为示例，此处为完整文档。