Created
October 19, 2022 03:58
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Scala script to convert Pascal VOC to CSV. For a medium article
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#!/usr/bin/env -S scala-cli shebang --scala-version 3.2.0 | |
//> using lib "org.scala-lang.modules::scala-xml:2.1.0" | |
import scala.xml.Elem | |
import java.io.File | |
import scala.xml.XML | |
import java.nio.file.Paths | |
import scala.util.Using | |
import java.nio.file.Files | |
case class Voc( | |
filename: String, | |
objects: Seq[VocObject] = Nil | |
) | |
case class VocObject( | |
name: String, | |
xmin: Int, | |
ymin: Int, | |
xmax: Int, | |
ymax: Int | |
): | |
val width = xmax - xmin | |
val height = ymax - ymin | |
object VocParser: | |
def parse(xml: Elem): Voc = | |
val filename = (xml \ "filename").text | |
val objects = xml \ "object" | |
val vocObjects = objects.map(n => { | |
val name = (n \ "name").text | |
// VOC is 1-based index. Convert to 0 based. | |
// See https://cv.gluon.ai/_modules/gluoncv/data/pascal_voc/detection.html#VOCDetection | |
val xmin = (n \ "bndbox" \ "xmin").text.toInt - 1 | |
val ymin = (n \ "bndbox" \ "ymin").text.toInt - 1 | |
val xmax = (n \ "bndbox" \ "xmax").text.toInt - 1 | |
val ymax = (n \ "bndbox" \ "ymax").text.toInt - 1 | |
VocObject(name, xmin, ymin, xmax, ymax) | |
}); | |
Voc(filename, objects = vocObjects) | |
if (args.length != 1) { | |
println("Usage: voc_to_csv.sc <path to VOC dir>") | |
System.exit(1) | |
} | |
val dir = Paths.get(args(0)) | |
Using(Files.list(dir)) { stream => | |
stream | |
.filter(_.toString.endsWith(".xml")) | |
.map(path => XML.loadFile(path.toFile())) | |
.map(VocParser.parse) | |
.forEach { voc => | |
voc.objects.foreach { obj => | |
println(s"${voc.filename},${obj.name},${obj.xmin},${obj.ymin},${obj.width},${obj.height}") | |
} | |
} | |
} | |
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