Capture RGB Image using OV5640

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Capture RGB Image using OV5640

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r2
Contributor II

I am using Linux kernel 3.0.35 on the i.MX6 dual core processor with an OV5640 camera sensor on the MIPI CSI-2 port.  I can receive still images and video from the sensor in YUV format using all of the modes and expected frame rates.

I have examined the ov5640_mipi.c file and note that V4L2_PIX_FMT_RGB565 is, or should be, supported.  However, it appears that the pixelformat value is only used to configure the csi-2 driver.  I do not see where the pixelformat parameter is used to configure the sensor output mode.  In fact, changing the pixelformat from V4L2_PIX_FMT_UYVY to V4L2_PIX_FMT_RGB565 gives me a very poor image.

Can anyone tell me what changes I need to make to the driver(s) in order to capture RGB still images? Thanks.

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kimlim
Contributor III

can only stick with DMA enabled GPU UYVY to RGB conversion for the time being. :smileyhappy:

http://events.linuxfoundation.org/sites/events/files/slides/slides_4.pdf

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joanxie
NXP TechSupport
NXP TechSupport

Refer to the linux Reference Manual,

The supported picture formats for OV5640 Using MIPI CSI-2 interface are:

• YUV422P

• UYVY

• YUV420

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kimlim
Contributor III

From i.MX 6Solo/6DualLite Linux Reference Manual, Rev. L3.0.35_4.1.0, 09/2013:

17.3 Driver Features

• Supporting 1-4 lanes

• Supporting IPU(0,1) and CSI(0,1)

• Supporting 0-3 virtual channels

• Supporting the following date types:

• RGB formats: RGB888, RGB666, RGB565, RGB555, RGB444

• YUV formats: YUV422 8bit, YUV422 10bit, YUV420 8bit, YUV420 10bit

• RAW data: RAW6, RAW7, RAW8, RAW10, RAW12, RAW14

However, the implemented V4L2 capture interface over the MIPI driver only support:

16.1.2 Software Operation

The camera driver implements the V4L2 capture interface and applications and uses the V4L2 capture interface to operate the camera.

The supported operations of V4L2 capture are:

• Capture stream mode

The supported picture formats are:

• YUV422P

• UYVY

• YUV420

The supported picture sizes are:

• QVGA

• VGA

• 720P

• 1080P

Hopefully we could get the support for RGB soon (save the GPU resources to convert from YUV to RGB for subsequent image processing).

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r2
Contributor II

Thanks, Kim.  This is exactly the information that I had gathered while reviewing the Linux documentation prior to posting my question.  I know that both the OV5640 and the V4L2 software can support RGB but the drivers provided by Freescale do not implement this format.  My original question solicited help in modifying the driver(s).  So, while someone put "Assumed Answered" on my posting, my question remains unanswered.  I take the liberty of reiterating your aspiration:  "Hopefully we could get the support for RGB soon ..."

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kimlim
Contributor III

may i know where can i download the linux Reference Manual?

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Yuri
NXP TechSupport
NXP TechSupport

http://www.freescale.com/webapp/Download?colCode=L3.0.35_4.1.0_LINUX_DOCS&Parent_nodeId=133769948107...


i.MX 6 Series Software and Development Tool R|Freescale

Have a great day,
Yuri

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