TDA4VM: gamma tuning in DCC

Hello Wang,

Latest tuning tool version is 2.50 ( https://www.ti.com/securesoftware/docs/autopagepreview.tsp?opnId=16092)

Tuning tool generates gamma curve lookup table (LUT) from the γ value using the equation 

V_out = V_in^γ

If you are using gamma for contract, there are other ways of doing it - like in decompanding LUT or in GLBCE.

If you want to specify a very custom gamma curve, you can always manually generate the LUT and replace tool generated LUT.

Regards,

Mayank

Mayank,

Thanks for your sharing. The web link of DCC 2.50 can not open, as shown below.

And does DCC2.50 support TDA4?

Hello Wang,

2.50 supports TDA4. Please share your myTI account so that I can grant you access.

Regards,

Mayank

Mayank,

MyTI account is "wang zhili (6814535)", and the email is "zhili.wang@hirain.com".

Hello Wang,

You should have access now. Please let me know if anything else needed on this issue.

Regards,

Mayank

Hello Mayank,

Now I can download the DCC 2.5, thanks. 

I have some questions about DCC:

1.How to distinguish VPACv1 and VAPCv3? Is it the difference in SDK or the difference in hardware?

2.I found that there is still no gamma curve tuning plugin which is dependent on brightness histogram, could you develop this function? Or is there any version DCC app that supports this funtion and is compatible with TDA4? 

3.The older version of DCC has the gamma curve tuning plugin, which I seen on the internet (shown in below), could you tell me why you remove this plugin?

Regards,

Wang zhili

Hi Mayank,

Could you please give me some answers to these questions?

Regards,

Wang

Hi Gang,

Thanks for your reply.

Can you or are you planning to develop Gamma curve given histogram? Because this function has a great effect on improving the brightness and contrast of the image, which is exactly what we need. 

Regards,

Zhili

Hi Gang,

Is the LUT you refered "sensor_name_lut_wdr_overall_pwl_global.txt" generated by DCC CFA+WDR plugin?

And is there a way tuning gamma after AE?

Regards,

Zhili

Hi Gang,

After I changed the values in file "flexcc_contrast_lut_0.txt", I can see the changes in images of TDA4.

So I want to know that what is the working mechanism of this file? Is it possible that we can adjust this gamma curve individually? For example to add it into DCC?

BTW, the FAEs in Beijing supporting HiRain you mentioned before have not contact us by far, could you please help to ask the arrangement of them? Thank you very much.

Regards,

Zhili

Hi Gang,

Gang Hua said:

you can change the default gamma curve or add control in s/w at openvx level for changing the curve dynamically

Can you explain this in detail? Or is there any guides for how to develop this feature?

Regards,

Zhili

Hi Gang,

I do not find any parameters related to gamma in "vx_vpac_viss_target_dcc.c".

In "vx_vpac_viss_target_defaults.c", I saw gamma lut has been set in function "tivxVpacVissDefaultMapGammaParams" and has been called by function "tivxVpacVissDefaultMapFlexCCParams". While in "vx_vpac_viss_target_dcc.c" only the CCM parameters have been setted and called in function "tivxVpacVissDCCMapFlexCCParams".

Therefore, where is the gamma parameters called and changed?