GNU Radio - HDTV Snapshots

Below are some single frame snapshots captured February 15, 2003. The source station was KSBW-DT, channel 10 (195 MHz), Salinas, CA. The program was "Law and Order", and the recording was made between 8 and 9 PM Pacific Standard Time.

Samples were recorded to disk in real time at 20M samples/second using the mc4020-read-adc program provided with the GNU Radio MC4020 A/D card driver. Once the samples were on disk, they were processed using the GNU Radio HDTV receiver, atsc_rx. The output of atsc_rx is an MPEG transport stream consisting of a sequence of 188-byte packets. The MPEG tranport stream was then fed into the Xine MPEG player and displayed. The 2730 x 1088 .png files were generated from within Xine.

diner 1001 x 399 jpg (about 70kB)
2730 x 1088 jpg (about 400kB)
2730 x 1088 png (about 4MB)
school 1001 x 399 jpg (about 70kB)
2730 x 1088 jpg (about 400kB)
2730 x 1088 png (about 4MB)
bookstore 1001 x 399 jpg (about 70kB)
2730 x 1088 jpg (about 400kB)
2730 x 1088 png (about 4MB)
food 1001 x 399 jpg (about 70kB)
2730 x 1088 jpg (about 400kB)
2730 x 1088 png (about 4MB)
park 1001 x 399 jpg (about 70kB)
2730 x 1088 jpg (about 400kB)
2730 x 1088 png (about 4MB)

Notes on Color

The 4MB .png files are the output of Xine's "snapshot" command. They appear too dark to me, and I suspect a problem with the gamma adjustment somewhere. In any event, the .png's have not been modified in any way.

The .jpeg files were created from the .png files using GIMP, www.gimp.org. In addition, the color was adjusted using Image->Colors->Auto->Equalize. This may have changed some of the details in the images, but they do look better. Suggestions for a better fix are welcome.