Another question about DM368IPNC-MT5 Reference Design Camera

Kien Nguyen said:

The Bayer's color filter arrays mosaic forms by 1 red filter, 1 blue filter and 2 green filters. The 5M pixel sensor is divided into 1.25M pixels groups for red and blue and 2.5M pixels for green.

Does it mean the native resolution for this camera is 1280x720 = 921,600 pixels (< 1.25 Mpixels) ?

When you demosaic the Bayer pattern image you calculate the missing two colors for each pixel based on the surrounding pixels, thus you keep the same resolution on your resulting output image as the sensor has for its Bayer pattern. In other words the 5MP image sensor generates an actual 5MP output image after Bayer demosaicing, each red, green, and blue filtered pixel becomes a full color pixel, interpolated based on its neighbors. The actual native resolution of the sensor/camera would then depend on the aspect ratio of the sensor, which I have not been able to quickly find without the sensor part number or datasheet.

Kien Nguyen said:

BTW, I kept sending the request to talk with Appropho's engineers, the request has not yet fulfilled. A moment ago,  I tried to get on their website :http://www.appropho.com/NewWeb/Product_DM368MT5_Spec.php#a

It is not accessible today ... hope it is just the web traffic's issue.

I just tried that link, and it opened for me, so the site may just be having intermittent issues.

Hi Kien,

Kien Nguyen said:

The DM368IPNC camera employed a Sony 5M pixels CMOS sensor, The Bayer pattern will be used to filter the color while the camera samples the input images.

The Bayer's color filter arrays mosaic forms by 1 red filter, 1 blue filter and 2 green filters. The 5M pixel sensor is divided into 1.25M pixels groups for red and blue and 2.5M pixels for green.

Does it mean the native resolution for this camera is 1280x720 = 921,600 pixels (< 1.25 Mpixels) ?

Firstly, i think you had a typo as we support 5MP Aptina CMOS sensor and not Sony. Let me know if it is mentioned on some TI or Appro website.

Anyways, coming to the Bayer Pattern question. Technically, you are right in the understanding of the bayer pattern. There is a Green, Red or Blue filter on each pixel that responds to the intensity of light. Now this means based on the pattern like RGGB, you would have 2 green filters and 1 Red and 1 Blue filter. Now for example, if we have a read at a particular pixel, but no green or blue, we need all colors to get the full information of that pixel. These 'missing' values are recovered using CFA interpolation. It is explained in more details on the Programmers Guide of VPFE or can be read on any Wiki page.

Kien Nguyen said:

BTW, I kept sending the request to talk with Appropho's engineers, the request has not yet fulfilled. A moment ago,  I tried to get on their website :http://www.appropho.com/NewWeb/Product_DM368MT5_Spec.php#a

It is not accessible today ... hope it is just the web traffic's issue.

I checked the URL at Appro side and it seems to be working at this time. I guess, it would have been some traffic or intermittent problem with their web server.

Let us know if you face issues in interacting or getting support on your IPNC Reference Design from Appro.

Regards,

Anshuman

Anshuman Saxena said:

Hi Kien,

The DM368IPNC camera employed a Sony 5M pixels CMOS sensor, The Bayer pattern will be used to filter the color while the camera samples the input images.

The Bayer's color filter arrays mosaic forms by 1 red filter, 1 blue filter and 2 green filters. The 5M pixel sensor is divided into 1.25M pixels groups for red and blue and 2.5M pixels for green.

Does it mean the native resolution for this camera is 1280x720 = 921,600 pixels (< 1.25 Mpixels) ?

Firstly, i think you had a typo as we support 5MP Aptina CMOS sensor and not Sony. Let me know if it is mentioned on some TI or Appro website.

Anyways, coming to the Bayer Pattern question. Technically, you are right in the understanding of the bayer pattern. There is a Green, Red or Blue filter on each pixel that responds to the intensity of light. Now this means based on the pattern like RGGB, you would have 2 green filters and 1 Red and 1 Blue filter. Now for example, if we have a read at a particular pixel, but no green or blue, we need all colors to get the full information of that pixel. These 'missing' values are recovered using CFA interpolation. It is explained in more details on the Programmers Guide of VPFE or can be read on any Wiki page.

I checked the URL at Appro side and it seems to be working at this time. I guess, it would have been some traffic or intermittent problem with their web server.

Let us know if you face issues in interacting or getting support on your IPNC Reference Design from Appro.

Regards,

Anshuman

Hi Anshuman,

Yes, it is my mistake,  the sensor is 5MP Aptina CMOS. I just verified the sensor posted in Appropho's website.

Appropho has not given the response regarding the implementation of 1280x720P60 feature, perhaps they are waiting for the commitment from TI ?

I am still waiting for TI engineer/sales contact me regards other question (Service Request#1-642741713)

Regards,

Kien

Bernie Thompson said:

The Bayer's color filter arrays mosaic forms by 1 red filter, 1 blue filter and 2 green filters. The 5M pixel sensor is divided into 1.25M pixels groups for red and blue and 2.5M pixels for green.

Does it mean the native resolution for this camera is 1280x720 = 921,600 pixels (< 1.25 Mpixels) ?