NYU-Depth数据集

数据集包含以下几个部分：

1. 有标签的：视频数据的一个子集，伴随着密集多标签。此数据也已经被预处理，以填补缺少的深度标签。
2. 原始数据集：利用Kinect测得的原始的RGB、Depth、加速度数据。
3. 工具箱：用于操作数据和标签的有用的工具。
4. 用于评估的训练和测试部分。

有标签的数据集

有标签的数据集是原始数据集的子集。它是由成对的RGB和深度帧同步组成的，并且每个图像都有多个标签。除了加上标签的深度地图之外（右），还包含了一组预处理的深度地图（中），该预处理的深度地图已经利用Colorization方法把确实数据填充了。与原始数据集不同，有标签数据集是一个matlab中的mat文件，有如下几个变量：（下面先不翻译了，用到了再说~）
- accelData – Nx4 matrix of accelerometer values indicated when each frame was taken. The columns contain the roll, yaw, pitch and tilt angle of the device.
- depths – HxWxN matrix of depth maps where H and W are the height and width, respectively and N is the number of images. The values of the depth elements are in meters.
- images – HxWx3xN matrix of RGB images where H and W are the height and width, respectively, and N is the number of images.
- labels – HxWxN matrix of label masks where H and W are the height and width, respectively and N is the number of images. The labels range from 1..C where C is the total number of classes. If a pixel’s label value is 0, then that pixel is ‘unlabeled’.
- names – Cx1 cell array of the english names of each class.
- namesToIds – map from english label names to IDs (with C key-value pairs)
- rawDepths – HxWxN matrix of depth maps where H and W are the height and width, respectively, and N is the number of images. These depth maps are the raw output from the kinect.
- scenes – Cx1 cell array of the name of the scene from which each image was taken

原始数据集

原始数据集包含利用Kinect得到的原始的图像以及加速度存储（accelerometer dumps）。RGB相机和深度相机采样率是20至30 FPS（帧/秒）(随着时间会有变化)。While the frames are not synchronized, the timestamps for each of the RGB, depth and accelerometer files are included as part of each filename（不是很懂这句的意思，求解释）。数据集分为不同的文件夹,这对应于每个场景的拍摄，都被命名为‘living_room_0012′ 或者 ‘office_0014′。文件结构如下所示：

/
../bedroom_0001/
../bedroom_0001/a-1294886363.011060-3164794231.dump
../bedroom_0001/a-1294886363.016801-3164794231.dump
…
../bedroom_0001/d-1294886362.665769-3143255701.pgm
../bedroom_0001/d-1294886362.793814-3151264321.pgm
…
../bedroom_0001/r-1294886362.238178-3118787619.ppm
../bedroom_0001/r-1294886362.814111-3152792506.ppm

• a-开头的是 accelerometer dumps
• d-开头的是深度图像
• r-开头的是原始rgb图像
  Note：由于原始数据集没有经过预处理，所以原始深度图像需要投影到RGB坐标系使得其对齐。

工具箱

The matlab toolbox has several useful functions for handling the data. To run the unit tests, you must have matlab’s xUniton your path.
- demo_synched_projected_frames.m – Demos synchronization of the raw rgb and depth images as well as alignment of the rgb and raw depth.
- eval_seg.m – Evaluates the predicted segmentation against the ground truth label map.
- get_projected_depth.m – Projects the raw depth image onto the rgb image plane. This file contains the calibration parameters that are specific to the kinect used to gather the data.
- get_accel_data.m – Extracts the accelerometer data from the binary files in the raw dataset.
- get_projection_mask.m – Gets a mask for the images that crops areas whose depth had to be inferred, rather than directly projected from the Kinect signal.
- get_synched_frames.m – Returns a list of synchronized rgb and depth frames from a given scene in the raw dataset.
- get_train_test_split.m – Splits the data in a way that ensures that images from the same scene are not found in both train and test sets.