Github user tomasatdatabricks commented on a diff in the pull request:
https://github.com/apache/spark/pull/20168#discussion_r160303995
--- Diff: mllib/src/main/scala/org/apache/spark/ml/image/ImageSchema.scala
---
@@ -37,20 +37,51 @@ import org.apache.spark.sql.types._
@Since("2.3.0")
object ImageSchema {
- val undefinedImageType = "Undefined"
-
/**
- * (Scala-specific) OpenCV type mapping supported
+ * OpenCv type representation
+ * @param mode ordinal for the type
+ * @param dataType open cv data type
+ * @param nChannels number of color channels
*/
- val ocvTypes: Map[String, Int] = Map(
- undefinedImageType -> -1,
- "CV_8U" -> 0, "CV_8UC1" -> 0, "CV_8UC3" -> 16, "CV_8UC4" -> 24
- )
+ case class OpenCvType(mode: Int, dataType: String, nChannels: Int) {
+ def name: String = "CV_" + dataType + "C" + nChannels
+ override def toString: String = "OpenCvType(mode = " + mode + ", name
= " + name + ")"
+ }
+
+ object OpenCvType {
+ def get(name: String): OpenCvType = {
+ ocvTypes.find(x => x.name == name).getOrElse(
+ throw new IllegalArgumentException("Unknown open cv type " + name))
+ }
+ def get(mode: Int): OpenCvType = {
+ ocvTypes.find(x => x.mode == mode).getOrElse(
+ throw new IllegalArgumentException("Unknown open cv mode " + mode))
+ }
+ val undefinedType = OpenCvType(-1, "N/A", -1)
--- End diff --
Yes, the name method should have special case for mode == -1.
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