depth_traits.h

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#ifndef DEPTH_IMAGE_PROC_DEPTH_TRAITS
#define DEPTH_IMAGE_PROC_DEPTH_TRAITS
 
// From https://github.com/ros-perception/image_pipeline/tree/foxy/depth_image_proc
 
#include <algorithm>
#include <cmath>
#include <cstdint>
#include <limits>
#include <vector>
 
namespace depth_image_proc {
 
// Encapsulate differences between processing float and uint16_t depths
template<typename T> struct DepthTraits {};
 
template<>
struct DepthTraits<uint16_t>
{
  static inline bool valid(uint16_t depth) { return depth != 0; }
  static inline float toMeters(uint16_t depth) { return depth * 0.001f; } // originally mm
  static inline uint16_t fromMeters(float depth) { return (depth * 1000.0f) + 0.5f; }
};
 
template<>
struct DepthTraits<float>
{
  static inline bool valid(float depth) { return std::isfinite(depth); }
  static inline float toMeters(float depth) { return depth; }
  static inline float fromMeters(float depth) { return depth; }
};
 
} // namespace depth_image_proc
 
#endif