Interlace questions about Genio-510 Camera MIPI

[Victor_Lin]

I would like to ask for your advice.

1. Interlace Input: If the sensor output is interlace, can an interlace signal be input through the MIPI interface?

2. ISP Bypass: Can externally input YUV signals bypass the ISP and directly enter the encoder?

[andy.hsieh]

Hi @Victor_Lin ,

@Victor_Lin

Interlace Input: If the sensor output is interlace, can an interlace signal be input through the MIPI interface?

Regarding interlaced signal processing on the Genio 510 platform, please consider the following hardware and software constraints:

1. Hardware Capability:

• While the MIPI interface can technically receive data, the Genio 510 ISP pipeline does not integrate a dedicated hardware de-interlacing block. Therefore, the SoC cannot perform hardware-accelerated de-interlacing automatically upon receiving the signal.

2. Software & Driver Implementation:

• The current V4L2 camera driver implementation treats the incoming data stream as a raw sequence. It does not actively detect the field type (Top/Bottom field) nor does it populate the v4l2_buffer flags (e.g., V4L2_FIELD_TOP, etc.) in the returned buffer.
• Since hardware support is absent, de-interlacing must be implemented via Software (SW De-interlace). This implies utilizing CPU or GPU resources in the application layer to merge or process fields. Currently, IoT Yocto doesn’t have a ready-made software solution for DI.
• Recommendation: You may need to manage the interlace logic manually, and implement a mechanism to track field order and perform the necessary image reconstruction within your application.

@Victor_Lin

1. ISP Bypass: Can externally input YUV signals bypass the ISP and directly enter the encoder?

Yes, the ISP bypass path is supported.

• The Genio 510 utilizes a Camera DMA engine called CamSV for “Pure Data Dump” operations. This path allows YUV data from the sensor to bypass the ISP processing blocks and be written directly to system memory.
• Reference: For detailed steps and V4L2 configuration for YUV sensors, please refer to the MediaTek IoT Online Document: BSP User Guide / Camera / Genio 510/700-EVK / V4L2 Sensor / YUV Sensor (V4L2 Sensor)