c++ - 照片拼接算法。如何在给定基本图像和瓷砖列表的情况下创建马赛克照片？

Question

Hy.What I have to do is to create a program (using C or C++), takes as input a 24bits/pixel bitmap and a gathering of images 我必须创建一个马赛克图像，类似于输入图像使用给定的图像库(创建类似于输入的马赛克照片)。

到目前为止，我可以访问输入的图像像素及其颜色，但我有点卡住了。我的问题是我应该从哪里开始？我需要一个可以做这样的事情的基本算法。而且我真的找不到任何东西(也许我看错了)。还有人可以告诉我一个随机的照片下载器，以便我可以为该项目下载小图像吗？有人能帮我吗？请告诉我从哪里开始以及使用什么。

Answer 1

我已经在 Scala 中完成了这个。 Dr Dobbs article对我非常有用。

示例图片:

这是我的基本算法:

def createMosaic(targetImage:BufferedImage,
  index:PhotoIndexer.PhotoIndex,
  opacity:Float,
  targetWidth:Int,
  targetHeight:Int,
  numRows:Int,
  numColumns:Int, callback:PhotoMosaicCallback): ImageGrid = {

      var indexCopy = index

      // Map from the buffered image to that image's average color
      var colorMap:Map[BufferedImage,Color] =
      index.values.map(data => (data.thumbnail, data.avgColor)).toMap

      // We look at rectangular regions of the target image, calculate their average
      // colors, and then pick images that match those colors.
      val sampleWidth = targetImage.getWidth / numColumns
      val sampleHeight = targetImage.getHeight / numRows

      // Used to report the progress of the process
      var counter = 1
      val numSubImages = numRows * numColumns

      val imageGrid:ImageGrid = Array.fill(numRows, numColumns)(Nil)

      // for each patch in the image
      for (row <- 0 until numRows) {
        for (column <- 0 until numColumns) {
          val x = column * sampleWidth
          val y = row * sampleHeight
          // This is the small rectangular region of the target image that we're
          // currently considering
          val subImage = targetImage.getData(new Rectangle(x,y,sampleWidth,sampleHeight))
          val avgImageColor = calculateColorFromRaster(subImage)

          val nearest:Seq[BufferedImage] = getNearestColorImages(avgImageColor, colorMap)

          // nearest is in sorted order; pick one of them and draw it to correct place in
          // image
          imageGrid(row)(column) = nearest

          callback.photosCalculated(row, column, nearest)

          val percent = 100.0 * counter / numSubImages
          // TODO: for GUI version, use a display bar
          if (counter % 100 == 0) {
            println(percent + " completed (" + counter + " of" + numSubImages + ")")
          }
          counter+=1
        }
      }
      imageGrid
}

My full sourcecode is available在知乎上