SONY CCD ICX249AL
Posted 06 June 2013 - 02:22 AM
I am using SONY ICX249AL CCD sensor and i have the following doubts.
1. Which control signal (pin) transfers the pixels charge in to veritical registers .
2. Is vertical registers are separate for odd and even coloumns , since odd and even rows readout is there.
3. I hope substrate pulse ( 4th pin) with combination of vertical clock pins ( 1, 2, 3, 6) controls the charge integration time, Is charge transfer time from odd pixels and even pixels are different or all pixels charge gets transfered to vertical registers are at single instant?.
Can anyone suggest the literature for complete understanding of this chip ?.
Posted 06 June 2013 - 06:39 AM
Posted 06 June 2013 - 07:50 AM
(1) V_phase_1 positive pulse "transfers" the odd lines, and V_phase_3 positive pulse "transfers" the even lines.
(2) Interline interlaced CCD uses the common vertical transfer shift registers.
(3) Modified X_sub timing is used in the electronic shutter.
For monochrome CCD (like your ICX249AL), the recommended method is to readout "odd lines only" for odd field info, and only even lines for an even field.
For complementary-color CMYG Bayer CCD (e.g., ICX249AK), the recommended method is to readout "1+2, 3+4, 5+6 ... lines" for odd field info, and to readout "2+3, 4+5, 6+7 ... lines" for an even field. The reason is for color-decoding.
Posted 11 June 2013 - 06:54 AM
4145field_mode_interlaced.jpg & 4145interline1.jpg.
(even and odd interchanged between these figures?).
Posted 11 June 2013 - 07:24 PM
This thread post #3 and my original post Part 5 both stated that in frame integration mode, old filed will have only odd lines. This is consistent with the common definition.
The in my original post Part 5, I issued an errata for a reason I can't remember, but I changed my mind. <-- probably the wrong move . Actually I had to modify the first diagram you were referring to to reflect that errata.
Anyway, I can't remember. But to be honest, I don't think it's necessary to drill down to this level of detail unless you are creating your own timing pattern and build your own CCD imager from scratch.
The other reason is that in modern CCD sensors, there are dummy pixels and optical black pixels surrounding the main image area. Taking them into account, odd lines and odd pixels will be based on where you define your point of origin and really doesn't matter any more.
One key take-away is:
- in frame integration mode (mostly used in B&W), it's preferential on spatial resolution
- in field integration mode, it's preferential on motion
Glad you are reading my old article. Hope the info is helpful.