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"But When i view the newly created mat, it is solid black. "

ah, this is now easy to answer. idk. , in which range your z values are, but most likely, your conversion to u8 needs a scale factor, like:

depth_image.convertTo(depth_image, CV_8U, 255.0); // offset, too ?

to be sure, check min/max vals before the conversion. (maybe you even got negative values ? requiring an offset ?)

double m,M;
minMaxLoc(depth_image, &m, &M, 0, 0);

alternatively, you could normalize your image (and change type on the way):

normalize(depth_image, depth_image, 0, 255, NORM_MINMAX, CV_8U);

"But When i view the newly created mat, it is solid black. "

ah, this is now easy to answer. idk. , in which range your z values are, but most likely, your conversion to u8 needs a scale factor, like:and maybe an offset (remember, you need [0..255] for u8).

depth_image.convertTo(depth_image, CV_8U, 255.0); // offset, too ?

to be sure, check min/max vals before the conversion. (maybe you even got negative values ? requiring an offset ?)

double m,M;
minMaxLoc(depth_image, &m, &M, 0, 0);

then use that information like:

depth_image.convertTo(depth_image, CV_8U, 255.0/(M-m), -m);

alternatively, you could normalize your image (and change type on the way):

normalize(depth_image, depth_image, 0, 255, NORM_MINMAX, CV_8U);