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only convert pix_fmt when necessary

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Blake Blackshear
2020-10-10 21:28:12 -05:00
parent a611cbb942
commit 12c4cd77c5
4 changed files with 42 additions and 12 deletions
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31
frigate/util.py
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@@ -70,6 +70,37 @@ def calculate_region(frame_shape, xmin, ymin, xmax, ymax, multiplier=2):
return (x_offset, y_offset, x_offset+size, y_offset+size)
def yuv_region_2_rgb(frame, region):
height = frame.shape[0]//3*2
width = frame.shape[1]
# make sure the size is a multiple of 4
size = (region[3] - region[1])//4*4
x1 = region[0]
y1 = region[1]
uv_x1 = x1//2
uv_y1 = y1//4
uv_width = size//2
uv_height = size//4
u_y_start = height
v_y_start = height + height//4
two_x_offset = width//2
yuv_cropped_frame = np.zeros((size+size//2, size), np.uint8)
# y channel
yuv_cropped_frame[0:size, 0:size] = frame[y1:y1+size, x1:x1+size]
# u channel
yuv_cropped_frame[size:size+uv_height, 0:uv_width] = frame[uv_y1+u_y_start:uv_y1+u_y_start+uv_height, uv_x1:uv_x1+uv_width]
yuv_cropped_frame[size:size+uv_height, uv_width:size] = frame[uv_y1+u_y_start:uv_y1+u_y_start+uv_height, uv_x1+two_x_offset:uv_x1+two_x_offset+uv_width]
# v channel
yuv_cropped_frame[size+uv_height:size+uv_height*2, 0:uv_width] = frame[uv_y1+v_y_start:uv_y1+v_y_start+uv_height, uv_x1:uv_x1+uv_width]
yuv_cropped_frame[size+uv_height:size+uv_height*2, uv_width:size] = frame[uv_y1+v_y_start:uv_y1+v_y_start+uv_height, uv_x1+two_x_offset:uv_x1+two_x_offset+uv_width]
return cv2.cvtColor(yuv_cropped_frame, cv2.COLOR_YUV2RGB_I420)
def intersection(box_a, box_b):
return (
max(box_a[0], box_b[0]),