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Displaying image on image analyzer

lijo jacob
Prodigy 170 points


Hi,

I am using omap l138 lcdk with ccs v6 for doing an image processing application. I have been able to read the input image through the image analyzer and perform the desired algorithm. The image has two intensity levels 0 and 256. The histogram meets the desired specifications but I am not able to display the image through the image analyzer. Though I am able to view the image using matlab using the image data obtained from ccs. I am attaching along this post my c code used and other relevant data required. My original image is comparatively large of the size of 452 X 450 but for using it in ccs I am converting it into 256 X 256. I am obtaining the required image data from matlab. My algorithm consists of individually analysing the r,g,b components of  and performing segmentation using wavelet networks. To make the computation easy I am not doing the weight determination part in ccs. I am simply copying the weight values from matlab and performing the rest of the algorithm. Can anybody help me how to display the output image. Thanking you in advance.thesisfinal.rar

  • 0
    TI__Guru**** 171309 points

    Hi,

    Thanks for sending the details; however, I am not entirely sure which variable holds the final image. My guess is that it is Xfinal, am I correct?

    If so, I ran the program and got the following image as a final result: a series of bits that were either 255 or 0 - no other levels were present on the output

    Is this correct? If so, check the parameters I used to display it.

    If not, can you send me what you would exactly expect from the output?

    Regards,

    Rafael

  • 0 in reply to desouza
    Prodigy 170 points

    Hi Rafael,
    First of all let me thank you for replying. Yes Xfinal is the output variable and it does holds two intensity levels i.e 0 and 255. But the output that I am supposed to get is not what has been obtained. Its a black and white image of a lesion whose information has been provided along with the code as lesion(red/green/blue)data.H. There is an image by name img.jpg which shows the actual image. And regarding the parameters I used the rgb format and I believe that is not much of an issue here. I have also attached along with the image output that I am expecting.

  • 0 in reply to lijo jacob
    TI__Guru**** 171309 points

    Hi,

    Thanks for sending the additional details. I was able to display the basic image shape, although you can play with the RGB components.

    I used the following parameters:

    Depending on the mask settings, you can have different color tones such as:

    One detail to notice is that some parameters are redundant - for example, Pixel stride (bytes) and Read data as, or Line stride (bytes) = Number of pixels per line X Pixel stride (bytes). I am not 100% sure why this was done this way, but by correctly adjusting this parameters the image works as expected.

    Hope this helps,

    Rafael

  • 0 in reply to desouza
    TI__Guru**** 171309 points
    Hi,

    I just noticed the image is rotated by 90° clockwise. Given the image analyzer scans memory only incrementally, this probably reflects how the image is stored in memory - a matrix transpose operation would be needed to reorder the image.

    Regards,
    Rafael
  • 0 in reply to desouza
    Prodigy 170 points
    Hi,
    Thanks for helping me out. But can you please tell me what changes you made to the previous post to display the result. I am also using almost the same setting as you have displayed except for pixel strides=1,red/green/blue mask as 0XFF , line strides as 256 and read data as 8 bit. And secondly regarding the clockwise shift I was able to get the image displayed correctly thanks to you.