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Now I'm reading a datasheet which is ov5642.

www.uctronics.com/download/cam_module/OV5642DS.pdf

But I can't understand the explain table6-6 format control register of yuv420.

Q1.How does yuv420 could be express such as "YYYY..../YUYV...."? Exactly what does it mean ? Does datasheet wrote as right?

Q2.Exactly, how does yuv420 real cameara make the output?

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The subsample code letters for the suffix numbers are J:a:b for YUV J:a:b 

J: horizontal sampling reference (width of the conceptual region). Usually, 4.
a: number of chrominance samples (Cr, Cb) in the first row of J pixels.
b: number of changes of chrominance samples (Cr, Cb)
    between first and second row of J pixels. 

Thus YUV420 uses 4H samples with 2 samples of Cr,Cb in the 1st of 3 rows with 0 between 1st & 2nd row.

The Omnivision specifies the formatter output sequence is correctly given as:

enter image description here enter image description here

Like SECAM, 4:2:0 only stores and transmits one color channel per line (the other channel being recovered from the previous line.

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