DLP4710EVM-LC: External video pattern question

Hi Philippe,

Thanks for your answer.

I know the patterns will be fed from HDMI port, however I don't understand how to compress several patterns in one frame? How can projector know when to send out trigger 1 (between frame) or trigger 2 (between pattern) as below.

We are using OpenCV "imshow", is that correct tool to do it? 

Thanks!

Derlin       

Hi Derlin,

Thank you for your patience on the coming support.

Your inquiry on pattern compression is important to us, but our team will likely be unable to reply until the new year.

Kind regards,

Austin

Hi Philippe,

Thanks for your reply.

I still don't have any clue on how to project external 2-D patterns via HDMI . Do you have an example on how you do it?

We usually send out pictures to projector using OpenCV imshow() function, but I don't think it is correct. How do you encode 3 patterns in one frame?

Thanks!

Derlin     

Hello Derlin,

Thank you for your patience. We will respond to your questions by the end of the week.

Regards,

Austin

Hi Philippe,

Thank you for your reply, I tried the following code but nothing happen, could you please take a time to look it?

        CY_I2C_CONFIG cyI2CConfig;
        CY_DATA_BUFFER cyDataBuffer;
        CY_I2C_DATA_CONFIG cyI2CDataConfig;
        unsigned char readBuffer[4096], writeBuffer[4096];
      
       // TI projector address

        cyI2CDataConfig.slaveAddress = 0x1B;
      
        memset(writeBuffer, 0x00, 4096);
        cyDataBuffer.buffer = writeBuffer;

        cyDataBuffer.buffer[0] = 0x52;  // LED disable
        cyDataBuffer.buffer[1] = 0x00;  //
    
        cyDataBuffer.length = 2;
    
        rStatus = CyI2cWrite(handle, &cyI2CDataConfig, &cyDataBuffer, timeout);
        
        if (rStatus != CY_SUCCESS)
        {
           printf("LED Diable fail \n");
        }
        sleep(0.5);
       

        // Load image to code   

        cv::Mat test_1 = cv::imread("1.png");
    
        
        memset(writeBuffer, 0x00, 4096);
        cyDataBuffer.buffer = writeBuffer;

        cyDataBuffer.buffer[0] = 0x96;  //   
        cyDataBuffer.buffer[1] = 0x00;  // 1 bit mono
        cyDataBuffer.buffer[2] = 0x01;  // One patten  
        cyDataBuffer.buffer[3] = 0x01;  // Red
        cyDataBuffer.buffer[4] = 0x10;  // Illuminatiom time 1st byte  10ms
        cyDataBuffer.buffer[5] = 0x27;  // Illuminatiom time 2nd byte  
        cyDataBuffer.buffer[6] = 0x00;  // Illuminatiom time 3rd byte   
        cyDataBuffer.buffer[7] = 0x00;  // Illuminatiom time 4th byte
        cyDataBuffer.buffer[8] = 0xB8;  // Pre-Dark 1st byte                 3ms  
        cyDataBuffer.buffer[9] = 0x0B;  // Pre-Dark 2nd byte
        cyDataBuffer.buffer[10] = 0x00; // Pre-Dark 3rd byte   
        cyDataBuffer.buffer[11] = 0x00; // Pre-Dark 4th byte
        cyDataBuffer.buffer[12] = 0x03; // Post-Dark 1st byte               3ms
        cyDataBuffer.buffer[13] = 0x96; // Post-Dark 2nd byte
        cyDataBuffer.buffer[14] = 0x03; // Post-Dark 3rd byte
        cyDataBuffer.buffer[15] = 0x03; // Post-Dark 4th byte
        cyDataBuffer.length = 16;
    
        rStatus = CyI2cWrite(handle, &cyI2CDataConfig, &cyDataBuffer, timeout);
        
        if (rStatus != CY_SUCCESS)
        {
           printf("Write  Fail \n");
        }
        sleep(0.5);

    
         memset(writeBuffer, 0x00, 4096);
        cyDataBuffer.buffer = writeBuffer;

        cyDataBuffer.buffer[0] = 0x05;  // light control-external pattern
        cyDataBuffer.buffer[1] = 0x03;  //
    
        cyDataBuffer.length = 2;
    
        rStatus = CyI2cWrite(handle, &cyI2CDataConfig, &cyDataBuffer, timeout);
        
        if (rStatus != CY_SUCCESS)
        {
           printf("External pattern setting fail \n");
        }
        sleep(0.5);

        memset(writeBuffer, 0x00, 4096);
        cyDataBuffer.buffer = writeBuffer;
        
        cyDataBuffer.buffer[0] = 0x92; // trigger out setting
        cyDataBuffer.buffer[1] = 0x03; // selete trigger 2 (bit0=1)  enable (bit1=1) Not inverted (bit2=0) 00000-011
        cyDataBuffer.buffer[2] = 0x00; // Not delay 4 bytes
        cyDataBuffer.buffer[3] = 0x00;
        cyDataBuffer.buffer[4] = 0x00;
        cyDataBuffer.buffer[5] = 0x00;
       
        cyDataBuffer.length = 6;

        rStatus = CyI2cWrite(handle, &cyI2CDataConfig, &cyDataBuffer, timeout);
              
        sleep(0.5);

        cyDataBuffer.buffer[0] = 0x52;  // LED Enable
        cyDataBuffer.buffer[1] = 0x07;  //
    
        cyDataBuffer.length = 2;
    
        rStatus = CyI2cWrite(handle, &cyI2CDataConfig, &cyDataBuffer, timeout);
        
        if (rStatus != CY_SUCCESS)
        {
           printf("LED Enable fail \n");
        }
      

         //Project pattern
         cv::imshow("1",test_1);

The pattern is as below, I tried 1bit mono (on or off) in red. 

Is there anything I need to add?

Thanks!

Derlin

Derlin,

What is the content of the image you are pushing through your OpenCV software? Did you encode your patterns within?

I can't comment on the OpenCV code itself. You probably will need to consult with available community resources for the OpenCV library for help with syntax and coding.

As for pseudo code and implementation help, you could try consulting our DLPC-API library (which is C-based) for some reference:

https://www.ti.com/tool/DLPC-API

I hope this helps.

Regards,

Philippe Dollo

Hi Philippe,

I received your replay (though not shown on this post). Can I ask you more questions? Can png or jpeg picture be used as pattern for external pattern streaming mode?

What software does TI recommend  to use for external pattern?

Thanks!

Derlin

Hi Derlin,

Our team will respond by the end of the day on Friday (1/15). Thank you for your patience.

Regards,

Austin

Hi Philippe,

I use GUI to setup external pattern stream mode (RGB, 8bit 3 pattern, trigger2 out), and I can see the trigger2 out signals when HDMI port is connected to PC.

I think I understand how to encod the patterns now.

My new question is the projector keep sending out trigger signals when HDMI is connected to PC. There is no way for me to sync trigger 2 signal of each pattern with camera.

Any suggestion?

Thanks!

Derlin     

Derlin,

Thank you for your patience. We will be back to you by EOD 1/15.

Regards,

Austin