85 lines
3.0 KiB
Protocol Buffer
85 lines
3.0 KiB
Protocol Buffer
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// Copyright 2020 The MediaPipe Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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syntax = "proto2";
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package mediapipe.face_geometry;
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option java_package = "com.google.mediapipe.modules.facegeometry";
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option java_outer_classname = "EnvironmentProto";
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// Defines the (0, 0) origin point location of the environment.
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//
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// The variation in the origin point location can be traced back to the memory
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// layout of the camera video frame buffers.
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//
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// Usually, the memory layout for most CPU (and also some GPU) camera video
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// frame buffers results in having the (0, 0) origin point located in the
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// Top Left corner.
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//
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// On the contrary, the memory layout for most GPU camera video frame buffers
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// results in having the (0, 0) origin point located in the Bottom Left corner.
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//
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// Let's consider the following example:
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//
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// (A) ---------------+
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// ___ |
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// | (1) | | |
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// | / \ | | |
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// | |---|===|-| |
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// | |---| | | |
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// | / \ | | |
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// | | | | | |
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// | | (2) |=| | |
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// | | | | | |
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// | |_______| |_| |
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// | |@| |@| | | |
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// | ___________|_|_ |
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// |
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// (B) ---------------+
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//
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// On this example, (1) and (2) have the same X coordinate regardless of the
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// origin point location. However, having the origin point located at (A)
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// (Top Left corner) results in (1) having a smaller Y coordinate if compared to
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// (2). Similarly, having the origin point located at (B) (Bottom Left corner)
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// results in (1) having a greater Y coordinate if compared to (2).
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//
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// Providing the correct origin point location for your environment and making
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// sure all the input landmarks are in-sync with this location is crucial
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// for receiving the correct output face geometry and visual renders.
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enum OriginPointLocation {
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BOTTOM_LEFT_CORNER = 1;
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TOP_LEFT_CORNER = 2;
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}
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// The perspective camera is defined through its vertical FOV angle and the
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// Z-clipping planes. The aspect ratio is a runtime variable for the face
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// geometry module and should be provided alongside the face landmarks in order
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// to estimate the face geometry on a given frame.
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//
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// More info on Perspective Cameras:
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// http://www.songho.ca/opengl/gl_projectionmatrix.html#perspective
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message PerspectiveCamera {
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// `0 < vertical_fov_degrees < 180`.
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optional float vertical_fov_degrees = 1;
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// `0 < near < far`.
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optional float near = 2;
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optional float far = 3;
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}
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message Environment {
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optional OriginPointLocation origin_point_location = 1;
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optional PerspectiveCamera perspective_camera = 2;
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}
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