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https://github.com/blakeblackshear/frigate.git
synced 2026-02-05 18:55:23 +03:00
Refactor yuv channel clear and resize/copy in copy_yuv_to_position() function
This commit is contained in:
Sergey Krashevich
parent
9e531b0b5b
commit
9d06577b8e
144
frigate/util.py
144
frigate/util.py
@ -429,6 +429,39 @@ def copy_yuv_to_position(
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source_frame=None,
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source_channel_dim=None,
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):
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def crop_clear(frame, position, fill_value):
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frame[position[1] : position[3], position[0] : position[2]] = fill_value
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def assign_resized_frame(
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destination_slice, source_slice, resize_dim, interpolation
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):
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destination_slice[:] = cv2.resize(
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source_slice,
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dsize=(resize_dim[1], resize_dim[0]),
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interpolation=interpolation,
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)
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def resize_copy(
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frame,
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source_frame,
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source_channel_dim,
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position,
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resize_dim,
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offset,
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interpolation=cv2.INTER_NEAREST,
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):
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dest_slice = frame[
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position[1] + offset[0] : position[1] + offset[0] + resize_dim[0],
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position[0] + offset[1] : position[0] + offset[1] + resize_dim[1],
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]
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source_slice = source_frame[
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source_channel_dim[1] : source_channel_dim[3],
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source_channel_dim[0] : source_channel_dim[2],
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]
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assign_resized_frame(dest_slice, source_slice, resize_dim, interpolation)
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# get the coordinates of the channels for this position in the layout
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y, u1, u2, v1, v2 = get_yuv_crop(
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destination_frame.shape,
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@ -440,104 +473,49 @@ def copy_yuv_to_position(
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),
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)
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# clear y
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destination_frame[
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y[1] : y[3],
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y[0] : y[2],
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] = 16
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# clear u1
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destination_frame[u1[1] : u1[3], u1[0] : u1[2]] = 128
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# clear u2
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destination_frame[u2[1] : u2[3], u2[0] : u2[2]] = 128
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# clear v1
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destination_frame[v1[1] : v1[3], v1[0] : v1[2]] = 128
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# clear v2
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destination_frame[v2[1] : v2[3], v2[0] : v2[2]] = 128
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# clear channels
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for pos in [y, u1, u2, v1, v2]:
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crop_clear(destination_frame, pos, fill_value=128 if pos != y else 16)
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if source_frame is not None:
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# calculate the resized frame, maintaining the aspect ratio
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source_aspect_ratio = source_frame.shape[1] / (source_frame.shape[0] // 3 * 2)
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dest_aspect_ratio = destination_shape[1] / destination_shape[0]
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dest_shape_0_quarter_aligned = destination_shape[0] // 4 * 4
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dest_shape_1_quarter_aligned = destination_shape[1] // 4 * 4
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if source_aspect_ratio <= dest_aspect_ratio:
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y_resize_height = int(destination_shape[0] // 4 * 4)
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y_resize_height = dest_shape_0_quarter_aligned
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y_resize_width = int((y_resize_height * source_aspect_ratio) // 4 * 4)
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else:
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y_resize_width = int(destination_shape[1] // 4 * 4)
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y_resize_width = dest_shape_1_quarter_aligned
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y_resize_height = int((y_resize_width / source_aspect_ratio) // 4 * 4)
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uv_resize_width = int(y_resize_width // 2)
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uv_resize_height = int(y_resize_height // 4)
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y_y_offset = int((destination_shape[0] - y_resize_height) / 4 // 4 * 4)
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y_x_offset = int((destination_shape[1] - y_resize_width) / 2 // 4 * 4)
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y_offset = [
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int((destination_shape[0] - y_resize_height) / 4 // 4 * 4),
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int((destination_shape[1] - y_resize_width) / 2 // 4 * 4),
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]
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uv_offset = [o // k for o, k in zip(y_offset, [4, 2])]
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uv_y_offset = y_y_offset // 4
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uv_x_offset = y_x_offset // 2
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interpolation = cv2.INTER_LINEAR
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# resize/copy y channel
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destination_frame[
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y[1] + y_y_offset : y[1] + y_y_offset + y_resize_height,
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y[0] + y_x_offset : y[0] + y_x_offset + y_resize_width,
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] = cv2.resize(
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source_frame[
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source_channel_dim["y"][1] : source_channel_dim["y"][3],
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source_channel_dim["y"][0] : source_channel_dim["y"][2],
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],
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dsize=(y_resize_width, y_resize_height),
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interpolation=interpolation,
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)
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# resize/copy u1
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destination_frame[
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u1[1] + uv_y_offset : u1[1] + uv_y_offset + uv_resize_height,
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u1[0] + uv_x_offset : u1[0] + uv_x_offset + uv_resize_width,
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] = cv2.resize(
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source_frame[
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source_channel_dim["u1"][1] : source_channel_dim["u1"][3],
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source_channel_dim["u1"][0] : source_channel_dim["u1"][2],
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],
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dsize=(uv_resize_width, uv_resize_height),
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interpolation=interpolation,
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)
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# resize/copy u2
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destination_frame[
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u2[1] + uv_y_offset : u2[1] + uv_y_offset + uv_resize_height,
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u2[0] + uv_x_offset : u2[0] + uv_x_offset + uv_resize_width,
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] = cv2.resize(
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source_frame[
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source_channel_dim["u2"][1] : source_channel_dim["u2"][3],
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source_channel_dim["u2"][0] : source_channel_dim["u2"][2],
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],
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dsize=(uv_resize_width, uv_resize_height),
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interpolation=interpolation,
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)
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# resize/copy v1
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destination_frame[
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v1[1] + uv_y_offset : v1[1] + uv_y_offset + uv_resize_height,
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v1[0] + uv_x_offset : v1[0] + uv_x_offset + uv_resize_width,
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] = cv2.resize(
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source_frame[
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source_channel_dim["v1"][1] : source_channel_dim["v1"][3],
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source_channel_dim["v1"][0] : source_channel_dim["v1"][2],
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],
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dsize=(uv_resize_width, uv_resize_height),
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interpolation=interpolation,
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)
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# resize/copy v2
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destination_frame[
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v2[1] + uv_y_offset : v2[1] + uv_y_offset + uv_resize_height,
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v2[0] + uv_x_offset : v2[0] + uv_x_offset + uv_resize_width,
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] = cv2.resize(
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source_frame[
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source_channel_dim["v2"][1] : source_channel_dim["v2"][3],
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source_channel_dim["v2"][0] : source_channel_dim["v2"][2],
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],
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dsize=(uv_resize_width, uv_resize_height),
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interpolation=interpolation,
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)
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# resize/copy channels
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for pos, offset, resize_dim, channel in zip(
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[y, u1, u2, v1, v2],
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[y_offset, uv_offset, uv_offset, uv_offset, uv_offset],
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[(y_resize_height, y_resize_width)]
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+ [(uv_resize_height, uv_resize_width)] * 4,
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["y", "u1", "u2", "v1", "v2"],
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):
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resize_copy(
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destination_frame,
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source_frame,
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source_channel_dim[channel],
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pos,
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resize_dim,
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offset,
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)
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def yuv_region_2_yuv(frame, region):
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