How to adjust Contrast in IPU DP module for i.MX6Quad

[yuuki]

Dear all,

We refer to the following document.

http://cache.freescale.com/files/training/doc/ftf/2014/FTF-CON-F0223.pdf
 - p24　IPUv3 Color Space Conversion

http://cache.freescale.com/files/training/doc/ftf/2014/FTF-CON-F0119.pdf
 - p49　DP (Display Processor)

We understand that we can coordinate Contrast by IPU DP module.

How to achieve  contrast adjustment under condition RGBA input and RGBA output using IPU DP module ?
Please provide sample code and  document of the code.

Best Regards,
Yuuki

[b36401]

It can be performed with IPU Image Converter color conversion:

Y’=Y*k + b
Cb’= (Cb-128)*k+128 = k*cb+128(1-k)
Cr’= (Cr-128)*k+128 = k*Cr+128(1-k)

here "k" is contrast factor and "b" is brightness level.

Have a great day,
Victor

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[yuuki]

b36401‌

Dear Victor-san,

Thank you for your response.

Would you tell me a procedure and the method to perform it in Image Converter?
Is there the sample code?

Is there the method to perform this in IPU Display Processor?
Is there the sample code?

Best Regards,
Yuuki