Read frame data about esp32-cam-demo HOT 7 CLOSED

The image looked posterized, so i checked the histogram. Here is the histogram of image bytes:

See that periodic structure? There are ranges of values, each is 16 units wide. This doesn't look like a random error.

Here is a histogram of bits in your image. It makes me think that two wires/pins from the camera are not connected. If i'm not mistaken, that's D7 and D6:

from esp32-cam-demo.

If you are using OV7725 in grayscale mode, http://your-ip/get returns raw image (without any headers), one byte per pixel. /pgm should return the same, plus PGM header. I can't really tell whether this result you get is due to an issue with hardware, code, or the viewer.
Can you attach this PGM file you get, or post a link to it?

from esp32-cam-demo.

Yes, sure, thank you very much for the swift reply.

Using 7725 camera, hardware data pin is D2-D7 (D0 D1 should be not used right?), Reset pin set to IO15, the rest is fully same.
pgm.zip

Also when I turn on "[ ] Enable test pattern on camera", and also OV7725 and OV2640, the test pattern not working. One more question, is OV2640 also supported now?

Thank you!!

from esp32-cam-demo.

The serial output:

from esp32-cam-demo.

OV2640 is supported now, although it is still has some random glitches in JPEG mode at 20MHz (might be signal integrity issue on WROVER-KIT board).

W.r.t. test pattern not working, can you give more info? Any error log? If there is no error, do you get some image instead?

from esp32-cam-demo.

Thanks, will check this and let you know later.

from esp32-cam-demo.

need some time to check it, will close it now, thanks for support

from esp32-cam-demo.