attr: remove unused raht_binary_level_threshold

cfg/octree-raht-ctc-lossless-geom-lossy-attrs.yaml

@@ -30,7 +30,6 @@ categories:
      # attribute coding -- reflectance
      -
        - !conditional '${has_refl}'
-       - rahtLeafDecimationDepth: 0
        - qp:
            r01: 52
            r02: 46
@@ -45,7 +44,6 @@ categories:
      # attribute coding -- colour
      -
        - !conditional '${has_colour}'
-       - rahtLeafDecimationDepth: 0
        - qp:
            r01: 52
            r02: 46

cfg/octree-raht-ctc-lossy-geom-lossy-attrs.yaml

@@ -35,7 +35,6 @@ categories:
      # attribute coding -- reflectance
      -
        - !conditional '${has_refl}'
-       - rahtLeafDecimationDepth: 0
        - qp:
            r01: 52
            r02: 46
@@ -50,7 +49,6 @@ categories:
      # attribute coding -- colour
      -
        - !conditional '${has_colour}'
-       - rahtLeafDecimationDepth: 0
        - qp:
            r01: 52
            r02: 46

cfg/trisoup-raht-ctc-lossy-geom-lossy-attrs.yaml

@@ -32,7 +32,6 @@ categories:
      # attribute coding -- colour
      -
        - !conditional '${has_colour}'
-       - rahtLeafDecimationDepth: 0
        - qp:
            r01: 52
            r02: 46

doc/README.options.md

@@ -229,11 +229,6 @@ Coding method to use for the current attribute:
   | 1     | Region Adaptive Hierarchical Transform (RAHT)              |
   | 2     | Hierarchical neighbourhood prediction as lifting transform |
 
-### `--rahtLeafDecimationDepth=INT-VALUE`
-Sets coefficients to zero in the bottom n levels of the RAHT tree.
-This option provides a means to perform chroma-subsampling.  Applies
-when `attribute=colour` only.
-
 ### `--rahtDepth=INT-VALUE`
 Number of bits for Morton representation of RAHT co-ordinate
 components.

tmc3/TMC3.cpp

@@ -400,11 +400,6 @@ ParseParameters(int argc, char* argv[], Parameters& params)
     "  1: Region Adaptive Hierarchical Transform (RAHT)\n"
     "  2: Hierarichical neighbourhood prediction as lifting transform")
 
-  ("rahtLeafDecimationDepth",
-    params_attr.aps.raht_binary_level_threshold, 3,
-    "Sets coefficients to zero in the bottom n levels of RAHT tree. "
-    "Used for chroma-subsampling in attribute=color only.")
-
   ("rahtDepth",
     params_attr.aps.raht_depth, 21,
     "Number of bits for morton representation of an RAHT co-ordinate"

tmc3/hls.h

@@ -266,7 +266,6 @@ struct AttributeParameterSet {
 
   //--- raht parameters
   int raht_depth;
-  int raht_binary_level_threshold;
 };
 
 //============================================================================

tmc3/io_hls.cpp

@@ -288,7 +288,6 @@ write(const AttributeParameterSet& aps)
 
   if (aps.attr_encoding == AttributeEncoding::kRAHTransform) {
     bs.writeUe(aps.raht_depth);
-    bs.writeUe(aps.raht_binary_level_threshold);
   }
 
   bool aps_extension_flag = false;
@@ -339,7 +338,6 @@ parseAps(const PayloadBuffer& buf)
 
   if (aps.attr_encoding == AttributeEncoding::kRAHTransform) {
     bs.readUe(&aps.raht_depth);
-    bs.readUe(&aps.raht_binary_level_threshold);
   }
 
   bool aps_extension_flag = bs.read();