luminance component of an image

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az
az 2018-11-30
回答： az 2018-11-30
Hi, I have a frame of a vedio sequence I which is a 288*532 double. How can I extract only the luminance component? Thanks.

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采纳的回答

Mark Sherstan
Mark Sherstan 2018-11-30
Run the following:
I = imread('test.png');
J = rgb2gray(I);
rgb2gray uses the same formual which is used to calculate luminance (to 3 decimal places the formula is):
0.299 * R + 0.587 * G + 0.114 * B
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az
az 2018-11-30
Thank you this is what I got. Please see the attachment.
Mark Sherstan
Mark Sherstan 2018-11-30
please provide the original image, video, and any given functions.

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az
az 2018-11-30
Hello Mark I trief to sent you the tennis_cif.yuv but the file is more than 30 K even in zipped condition. is there any way I can attach that big file? Thank you for your efforts.
  1 个评论
Image Analyst
Image Analyst 2018-11-30
编辑：Image Analyst 2018-11-30
Just attach the one frame, not the entire video. One frame will certainly be small enough to attach!
And explain why using rgb2gray() on the RGB image did not work.

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az
az 2018-11-30
All I can say you need to have this file to the vedio file path to open that in mathlab. Thanks.
az
az 2018-11-30
Hello Mark, this the 'I_1' the one frame of the vedio. Thank you.

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