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  2. Depth Estimation is the task of measuring the distance of each pixel relative to the camera. Depth is extracted from either monocular (single) or stereo (multiple views of a scene) images. Traditional methods use multi-view geometry to find the relationship between the images.

  3. Jan 17, 2024 · The promise of depth estimation from a single image, known as Monocular Depth Estimation, is huge: without any special hardware or extra data, any image, no matter when or how it was created,...

    • Introduction
    • Downloading The Dataset
    • Building A Data Pipeline
    • Building The Model
    • Defining The Loss
    • Visualizing Model Output
    • Possible Improvements
    • References

    Depth estimation is a crucial step towards inferring scene geometry from 2D images.The goal in monocular depth estimationis to predict the depth value of each pixel orinferring depth information, given only a single RGB image as input.This example will show an approach to build a depth estimation model with a convnetand simple loss functions.

    We will be using the dataset DIODE: A Dense Indoor and Outdoor Depth Dataset for thistutorial. However, we use the validation set generating training and evaluation subsetsfor our model. The reason we use the validation set rather than the training set of the original dataset is becausethe training set consists of 81GB of data, which is challenging...

    The pipeline takes a dataframe containing the path for the RGB images,as well as the depth and depth mask files.
    It reads and resize the RGB images.
    It reads the depth and depth mask files, process them to generate the depth map image andresize it.
    It returns the RGB images and the depth map images for a batch.
    The basic model is from U-Net.
    Addditive skip-connections are implemented in the downscaling block.

    We will optimize 3 losses in our mode.1. Structural similarity index(SSIM).2. L1-loss, or Point-wise depth in our case.3. Depth smoothness loss. Out of the three loss functions, SSIM contributes the most to improving model performance.

    We visualize the model output over the validation set.The first image is the RGB image, the second image is the ground truth depth map imageand the third one is the predicted depth map image. 1/1 ━━━━━━━━━━━━━━━━━━━━ 0s 781ms/step 1/1 ━━━━━━━━━━━━━━━━━━━━ 1s 782ms/step 1/1 ━━━━━━━━━━━━━━━━━━━━ 0s 171ms/step 1/1 ━━━━━━━━━━━━━━━━━━━━ 0s 172ms/step

    You can improve this model by replacing the encoding part of the U-Net with apretrained DenseNet or ResNet.
    Loss functions play an important role in solving this problem.Tuning the loss functions may yield significant improvement.

    The following papers go deeper into possible approaches for depth estimation.1. Depth Prediction Without the Sensors: Leveraging Structure for Unsupervised Learning from Monocular Videos2. Digging Into Self-Supervised Monocular Depth Estimation3. Deeper Depth Prediction with Fully Convolutional Residual Networks You can also find helpful implementa...

  4. Oct 13, 2021 · Definition. Depth estimation describes the process of measuring or estimating distances from sensor data, typically in a 2D array of depth range data. The sensors may be either optical camera configurations (monocular, stereo, or multiview stereo camera rigs), active projector-camera configurations, or active range cameras. Background.

  5. EPTH estimation from a single image (SIDE, short for Single Image Depth Estimation) is the task of estimating a dense depth map for a given single RGB image. More specifically, for each pixel in the given RGB image, one needs to estimate a metric depth value. An example of an input image and corresponding depth map can be seen in Figure1.

  6. Depth estimation or extraction refers to the set of techniques and algorithms aiming to obtain a representation of the spatial structure of a scene. In other terms, to obtain a measure of the distance of, ideally, each point of the seen scene. We will talk, as well, about 3D vision.

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