176 lines
4.3 KiB
ReStructuredText
176 lines
4.3 KiB
ReStructuredText
.. Permission is granted to copy, distribute and/or modify this
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.. document under the terms of the GNU Free Documentation License,
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.. Version 1.1 or any later version published by the Free Software
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.. Foundation, with no Invariant Sections, no Front-Cover Texts
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.. and no Back-Cover Texts. A copy of the license is included at
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.. Documentation/media/uapi/fdl-appendix.rst.
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..
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.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
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.. _v4l2-meta-fmt-vsp1-hgo:
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*******************************
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V4L2_META_FMT_VSP1_HGO ('VSPH')
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*******************************
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Renesas R-Car VSP1 1-D Histogram Data
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Description
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===========
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This format describes histogram data generated by the Renesas R-Car VSP1 1-D
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Histogram (HGO) engine.
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The VSP1 HGO is a histogram computation engine that can operate on RGB, YCrCb
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or HSV data. It operates on a possibly cropped and subsampled input image and
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computes the minimum, maximum and sum of all pixels as well as per-channel
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histograms.
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The HGO can compute histograms independently per channel, on the maximum of the
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three channels (RGB data only) or on the Y channel only (YCbCr only). It can
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additionally output the histogram with 64 or 256 bins, resulting in four
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possible modes of operation.
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- In *64 bins normal mode*, the HGO operates on the three channels independently
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to compute three 64-bins histograms. RGB, YCbCr and HSV image formats are
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supported.
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- In *64 bins maximum mode*, the HGO operates on the maximum of the (R, G, B)
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channels to compute a single 64-bins histogram. Only the RGB image format is
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supported.
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- In *256 bins normal mode*, the HGO operates on the Y channel to compute a
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single 256-bins histogram. Only the YCbCr image format is supported.
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- In *256 bins maximum mode*, the HGO operates on the maximum of the (R, G, B)
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channels to compute a single 256-bins histogram. Only the RGB image format is
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supported.
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**Byte Order.**
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All data is stored in memory in little endian format. Each cell in the tables
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contains one byte.
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.. flat-table:: VSP1 HGO Data - 64 Bins, Normal Mode (792 bytes)
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:header-rows: 2
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:stub-columns: 0
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* - Offset
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- :cspan:`4` Memory
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* -
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- [31:24]
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- [23:16]
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- [15:8]
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- [7:0]
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* - 0
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-
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- R/Cr/H max [7:0]
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-
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- R/Cr/H min [7:0]
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* - 4
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-
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- G/Y/S max [7:0]
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-
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- G/Y/S min [7:0]
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* - 8
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-
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- B/Cb/V max [7:0]
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-
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- B/Cb/V min [7:0]
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* - 12
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- :cspan:`4` R/Cr/H sum [31:0]
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* - 16
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- :cspan:`4` G/Y/S sum [31:0]
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* - 20
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- :cspan:`4` B/Cb/V sum [31:0]
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* - 24
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- :cspan:`4` R/Cr/H bin 0 [31:0]
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* -
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- :cspan:`4` ...
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* - 276
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- :cspan:`4` R/Cr/H bin 63 [31:0]
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* - 280
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- :cspan:`4` G/Y/S bin 0 [31:0]
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* -
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- :cspan:`4` ...
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* - 532
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- :cspan:`4` G/Y/S bin 63 [31:0]
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* - 536
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- :cspan:`4` B/Cb/V bin 0 [31:0]
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* -
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- :cspan:`4` ...
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* - 788
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- :cspan:`4` B/Cb/V bin 63 [31:0]
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.. flat-table:: VSP1 HGO Data - 64 Bins, Max Mode (264 bytes)
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:header-rows: 2
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:stub-columns: 0
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* - Offset
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- :cspan:`4` Memory
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* -
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- [31:24]
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- [23:16]
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- [15:8]
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- [7:0]
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* - 0
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-
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- max(R,G,B) max [7:0]
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-
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- max(R,G,B) min [7:0]
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* - 4
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- :cspan:`4` max(R,G,B) sum [31:0]
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* - 8
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- :cspan:`4` max(R,G,B) bin 0 [31:0]
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* -
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- :cspan:`4` ...
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* - 260
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- :cspan:`4` max(R,G,B) bin 63 [31:0]
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.. flat-table:: VSP1 HGO Data - 256 Bins, Normal Mode (1032 bytes)
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:header-rows: 2
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:stub-columns: 0
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* - Offset
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- :cspan:`4` Memory
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* -
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- [31:24]
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- [23:16]
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- [15:8]
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- [7:0]
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* - 0
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-
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- Y max [7:0]
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-
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- Y min [7:0]
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* - 4
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- :cspan:`4` Y sum [31:0]
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* - 8
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- :cspan:`4` Y bin 0 [31:0]
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* -
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- :cspan:`4` ...
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* - 1028
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- :cspan:`4` Y bin 255 [31:0]
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.. flat-table:: VSP1 HGO Data - 256 Bins, Max Mode (1032 bytes)
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:header-rows: 2
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:stub-columns: 0
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* - Offset
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- :cspan:`4` Memory
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* -
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- [31:24]
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- [23:16]
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- [15:8]
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- [7:0]
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* - 0
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-
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- max(R,G,B) max [7:0]
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-
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- max(R,G,B) min [7:0]
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* - 4
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- :cspan:`4` max(R,G,B) sum [31:0]
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* - 8
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- :cspan:`4` max(R,G,B) bin 0 [31:0]
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* -
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- :cspan:`4` ...
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* - 1028
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- :cspan:`4` max(R,G,B) bin 255 [31:0]
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