TDA4VM: Single_cam application resolution

Alberto Zapata

Part Number: TDA4VM

Hello,

I am new with vision_apps and I have a question about re-scaling in single_cam application.

I have a camera with a 1280x720 camera and a 1920x1080 monitor. When I run single_cam application (without LDC filter) I don't see the video in full-screen mode, but when I run it with LDC filter, I see the video in full-screen mode (pictures attached)

Output without LDC filter

Output with LDC filter

I would like to modify the application to show my image in full-screen mode but without LDC filter. I tried to read the code where LDC filter is applied but I couldn't identify where the image is resized.

I have read that up-scaling is not possible, but I don't know if technically is the same that showing an image in full-screen mode. And if both are the same, why I can see LDC image in full-screen?

I am currently using psdk-rtos-j721e-evm-08_00_00_12.

Thank you so much, regards!

over 3 years ago

+1 Nikhil Dasan over 2 years ago

TI__Guru* 84686 points

Hi

May I know if you have configured your DSS (display) with the configuration parameters for 1080p or 720p?

If not 720p, could you try to configure the same for 720p?
You would have to change the DSS params (such as width, height, hFrontPorch, hBackPorch etc..) in PSDKRA/vision_apps/apps/basic_demos/app_rtos/common/app_init.c

Regards,
Nikhil Dasan

0 Alberto Zapata over 2 years ago in reply to Nikhil Dasan

Prodigy 20 points

Hello, thanks for your answer

Perfect, it worked! I used these parameters that I see in the app_init.c file

prm.timings.width = 1280U;
prm.timings.height = 720U;
prm.timings.hFrontPorch = 110U;
prm.timings.hBackPorch = 220U;
prm.timings.hSyncLen = 40U;
prm.timings.vFrontPorch = 5U;
prm.timings.vBackPorch = 20U;
prm.timings.vSyncLen = 5U;
prm.timings.pixelClock = 74250000ULL;

On the other hand, I have other screen with a 1024×600 resolution, how can I determine the parameters for this screen?

Link: https://www.waveshare.com/wiki/10.1inch_HDMI_LCD?amazon

Regards.

+1 Nikhil Dasan over 2 years ago in reply to Alberto Zapata

TI__Guru* 84686 points

Hi,

1024 x 600 is not a standard resolution as per VESA standard.
Please refer the below doc for the resolutions under VESA std.

https://ez.analog.com/cfs-filesystemfile/__key/communityserver-discussions-components-files/331/0250.vesa_5F00_dmt_5F00_1.12.pdf?_=636869585122834374

In your case, you must check with the vendor in order to know these values.

Regards,
Nikhil

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TDA4VM: Single_cam application resolution