Capturing RGB888 1080P 30fps with MIPI Camera

nithish — Mon, 06 Mar 2017 09:36:49 GMT

Hi ,

We have a requirement to capture 1080p 30fps, 720p 30fps video with RGB colour 24Bit Depth . While going through the MIPI/CSI2 document i found this example,

• 6-MP camera, 4-lane configuration, 15 fps, RGB888 format:

6 MP * 15 fps * 1.5 cycle/pixel * 1.35 blank interval = 182.25 MHz

In document and community i see YUC422 is being used to capture the above resolution video , which is 8bit/pixel.

I also found that the maximum speed of the interface is 200MHz for 4 data lanes configuration (800 Mb/s/lane, 400 MB/s).

And i did some calculation explained in MIPI–CSI2 Peripheral on i.MX6 MPUs (section 2.3.1. Bandwidth -AN5305.pdf) document

===========================================================

Calculation for 1080p FH = 1920

FW = 1080

30 frames per second

F = 1920*1080*30*1.3*3

= 242.6112MHz

===========================================================

Calculation for 1080p FH = 1920

FW = 1080

60 frames per second

F = 1920*1080*60*1.3*3

= 485.2224MHz

===========================================================

Calculation for 720p FH = 1280

FW = 720

30 frames per second

F = 1280*720*30*1.3*3

= 107.8272MHz

===========================================================

Calculation for 720p FH = 1280

FW = 720

60 frames per second

F = 1280*720*60*1.3*3

= 215.6544MHz

===========================================================

From this what i see is only 720p 30fps capturing is possible.

In this document "i.MX 6 Series Processors for Video Surveillance Application" it is given that the encoder can encode 1080p60 720p60 . Im confused as im new to media processing.

Can the above requirement be met without using a software to render it by the i.MX6QP ?

Thanks

Nithish A N

Re: Capturing RGB888 1080P 30fps with MIPI Camera

joanxie — Tue, 07 Mar 2017 09:43:21 GMT

refer to the imx6Q Reference Manual, if you use YUV422 over 8 bit = 2 cycles/pixel

topic Capturing RGB888 1080P 30fps with MIPI Camera in i.MX Processors

Capturing RGB888 1080P 30fps with MIPI Camera

Re: Capturing RGB888 1080P 30fps with MIPI Camera