[ADV728xA-M] Any method or register settings to improve image quality after I2P conversion.

Hi,

 As per expert comment "I2P does not contain smoothing filter. But by Modifying some of the registers in the ADV728x we can see some improvement in the image.
     Please try reading the Chroma filter, Luma Filter, Chroma Transient Improvement, Digital Noise Reduction and Luma  Peaking Filter, and Comb filter sections of the ADV728x hardware manual. You may get some improvement .

Please note that If it is custom board,Please refer application note for layout design www.analog.com/.../AN-1337.pdf
Note : Ensure the proper clock rate(27Mhz) has given.

           All filtering and termination is performed in the D-PHY layer of the ADV7280-M,
ADV7281-M, ADV7281-MA, and ADV7282-M transmitter devices and in the D-PHY layer
of the MIPI CSI-2 receiver. Do not place additional components, such as resistors,
electrostatic discharge (ESD) diodes, capacitors, or common-mode chokes on the MIPI CSI-2 traces
 And also the feedback loop between the current clamps and the video processor fine-tunes this coarse dc offset and makes the clamping robust to noise on the video input.So the current clamps are controlled within a feedback loop between the AFE and the video processor; the coarse clamps are not.

Thanks,

Poornima

Hi,

 As per expert comment "I2P does not contain smoothing filter. But by Modifying some of the registers in the ADV728x we can see some improvement in the image.
     Please try reading the Chroma filter, Luma Filter, Chroma Transient Improvement, Digital Noise Reduction and Luma  Peaking Filter, and Comb filter sections of the ADV728x hardware manual. You may get some improvement .

Please note that If it is custom board,Please refer application note for layout design www.analog.com/.../AN-1337.pdf
Note : Ensure the proper clock rate(27Mhz) has given.

           All filtering and termination is performed in the D-PHY layer of the ADV7280-M,
ADV7281-M, ADV7281-MA, and ADV7282-M transmitter devices and in the D-PHY layer
of the MIPI CSI-2 receiver. Do not place additional components, such as resistors,
electrostatic discharge (ESD) diodes, capacitors, or common-mode chokes on the MIPI CSI-2 traces
 And also the feedback loop between the current clamps and the video processor fine-tunes this coarse dc offset and makes the clamping robust to noise on the video input.So the current clamps are controlled within a feedback loop between the AFE and the video processor; the coarse clamps are not.

Thanks,

Poornima

Hi,

Thank you for your reply!

About your comment,
"I2P does not contain smoothing filter. But by Modifying some of the registers in the ADV728x we can see some improvement in the image.
 Please try reading the Chroma filter, Luma Filter, Chroma Transient Improvement, Digital Noise Reduction and Luma  Peaking Filter,
 and Comb filter sections of the ADV728x hardware manual. You may get some improvement ."

If you have any example or reference information how / which register should be changed for the improvement, could you tell me it?
The filter registers you indicated are too much. So the customer wants the example / reference information how the registers should be changed for the improvement.
It really helps the customer

Thank you!
Best regards.
Tamu

Hi,

  Below i have provided these register information and these information will also be available in hardware manuals,

    1.Digital noise reduction (DNR ) is based on the assumption that high frequency signals with low amplitude are probably noise and that their removal, therefore, improves picture quality, But by default this block will be enabled, So please make sure with the register 0x4D.

  2. ADV728x contains a chroma transient improvement (CTI) processor that sharpens the edge rate of chroma transitions, resulting in sharper vertical transitions. However, it operates only on edges above a certain threshold to ensure that noise is not emphasized. . But by default this block will also be enabled. Also Please make sure with these related registers like CTI_AB_EN, CTI_AB in register 0x4D.

  3. Luma and chroma related configuration is available in register 0x17, in reference script we have configured this 0x17 register as 41. Please refer figure25(YSFM and WYSFM Control Flowchart) and change the Y/C filter configuration according to your need.

Generally luma and chroma filters are used to set the bandwidth of the luma and chroma. 2D comb filters are used for Y-C separation.

Thanks,

Poornima

Hi,

Thank you for your reply.
I told your information to the customer and they have been trying them to improve the image quality.
If they have some additional questions, please let me ask them.
If they have no additional questions, I'll close this question.

Thank you!
Best regards.
Tamu

Hi,

 Thank You.

Regards,

Poornima

Thank you!