Internal change
PiperOrigin-RevId: 524059494
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055accece8
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@ -84,14 +84,12 @@ void Sigmoid(absl::Span<const float> values,
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// Linearly interpolate the value between v0 and v1. Assume 0 <= t <= 1.
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float LinearInterpolate(float v0, float v1, float t) {
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DCHECK(t >= 0 && t <= 1);
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return v0 + (v1 - v0) * t;
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}
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// Bilinearly interpolate the value between 4 points. Assume 0 <= t0, t1 <= 1.
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float BilinearInterpolate(float v00, float v10, float v01, float v11, float t0,
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float t1) {
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DCHECK(t0 >= 0 && t0 <= 1 && t1 >= 0 && t1 <= 1);
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return LinearInterpolate(LinearInterpolate(v00, v10, t0),
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LinearInterpolate(v01, v11, t0), t1);
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}
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@ -120,46 +118,51 @@ Image ProcessForCategoryMaskCpu(const Shape& input_shape,
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cv::Mat category_mask_mat_view =
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mediapipe::formats::MatView(image_frame_ptr.get());
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const int input_channels = input_shape.channels;
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category_mask_mat_view.forEach<uint8_t>(
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[&tensors_buffer, &input_shape, &width_scale, &height_scale,
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&input_channels, &options](uint8_t& pixel, const int position[]) {
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std::vector<float> confidence_scores(input_channels);
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int y0 = static_cast<int>(std::floor(position[0] * height_scale));
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int x0 = static_cast<int>(std::floor(position[1] * width_scale));
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int y1 = static_cast<int>(std::ceil(position[0] * height_scale));
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int x1 = static_cast<int>(std::ceil(position[1] * width_scale));
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float t0 = position[0] * height_scale - y0;
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float t1 = position[1] * width_scale - x0;
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for (int i = 0; i < input_channels; ++i) {
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confidence_scores[i] = BilinearInterpolate(
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GetTensorElement(input_shape, tensors_buffer, x0, y0, i),
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GetTensorElement(input_shape, tensors_buffer, x0, y1, i),
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GetTensorElement(input_shape, tensors_buffer, x1, y0, i),
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GetTensorElement(input_shape, tensors_buffer, x1, y1, i), t0, t1);
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}
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absl::Span<float> confidence_scores_span(confidence_scores.data(),
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confidence_scores.size());
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category_mask_mat_view.forEach<uint8_t>([&tensors_buffer, &input_shape,
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&width_scale, &height_scale,
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&input_channels,
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&options](uint8_t& pixel,
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const int position[]) {
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std::vector<float> confidence_scores(input_channels);
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int y0 =
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static_cast<int>(std::max(std::floor(position[0] * height_scale), 0.f));
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int x0 =
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static_cast<int>(std::max(std::floor(position[1] * width_scale), 0.f));
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int y1 = static_cast<int>(std::min(std::ceil(position[0] * height_scale),
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input_shape.height - 1.f));
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int x1 = static_cast<int>(std ::min(std::ceil(position[1] * width_scale),
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input_shape.width - 1.f));
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float t0 = std::max(std::min(position[0] * height_scale - y0, 1.f), 0.f);
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float t1 = std::max(std::min(position[1] * width_scale - x0, 1.f), 0.f);
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for (int i = 0; i < input_channels; ++i) {
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confidence_scores[i] = BilinearInterpolate(
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GetTensorElement(input_shape, tensors_buffer, x0, y0, i),
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GetTensorElement(input_shape, tensors_buffer, x0, y1, i),
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GetTensorElement(input_shape, tensors_buffer, x1, y0, i),
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GetTensorElement(input_shape, tensors_buffer, x1, y1, i), t0, t1);
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}
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absl::Span<float> confidence_scores_span(confidence_scores.data(),
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confidence_scores.size());
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// Only process the activation function if it is SIGMOID. If NONE,
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// we do nothing for activation, If SOFTMAX, it is required
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// to have input_channels > 1, and for input_channels > 1, we don't need
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// activation to find the maximum value.
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if (options.activation() == SegmenterOptions::SIGMOID) {
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Sigmoid(confidence_scores_span, confidence_scores_span);
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}
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if (input_channels == 1) {
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// if the input tensor is a single mask, it is assumed to be a binary
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// foreground segmentation mask. For such a mask, we make foreground
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// category 1, and background category 0.
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pixel = static_cast<uint8_t>(confidence_scores[0] > 0.5f);
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} else {
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const int maximum_category_idx =
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std::max_element(confidence_scores.begin(),
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confidence_scores.end()) -
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confidence_scores.begin();
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pixel = maximum_category_idx;
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}
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});
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// Only process the activation function if it is SIGMOID. If NONE,
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// we do nothing for activation, If SOFTMAX, it is required
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// to have input_channels > 1, and for input_channels > 1, we don't need
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// activation to find the maximum value.
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if (options.activation() == SegmenterOptions::SIGMOID) {
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Sigmoid(confidence_scores_span, confidence_scores_span);
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}
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if (input_channels == 1) {
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// if the input tensor is a single mask, it is assumed to be a binary
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// foreground segmentation mask. For such a mask, we make foreground
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// category 1, and background category 0.
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pixel = static_cast<uint8_t>(confidence_scores[0] > 0.5f);
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} else {
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const int maximum_category_idx =
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std::max_element(confidence_scores.begin(), confidence_scores.end()) -
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confidence_scores.begin();
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pixel = maximum_category_idx;
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}
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});
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return category_mask;
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}
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