Calibrate response receives infinite results

[glennliu]

Hi

I'm trying to calibrate the response of my camera. When I run the program, I found the results as follow,

It shows the irradiance and inverse response goes to infinite. My guess is it related to the mean irradiance of all images, which range between [2.5, 182.6]. However, the exposure I set is between [0.06ms 200ms], with 167 images and exposure in multiplicative increments of 1.05. It is definitely overexposed at large expo time, and visually black at low expo time. I'm not sure what's wrong with this image data.

Meanwhile, the following points are especially noticed and ensured,

• a constant scene with not moving objects and change light.
• the compiled program worked correctly on the "narrow_sweep3" dataset.

Please let me if you have any advice.

Thanks

[gauti1311]

hello, @glennliu may i know how you take the images with different exposures. i am using webcam with auto exposure and also a monocular industrial camera. And also i am getting results like as you mentioned above.

[glennliu]

hello, @glennliu may i know how you take the images with different exposures. i am using webcam with auto exposure and also a monocular industrial camera. And also i am getting results like as you mentioned above.

Hi

I wrote a simple program to auto change exposure and record images. The exposure time multiplicative increment at 1.05. My initial guess is that when at lowest exposure time, it should capture some pixels at high intensity as well. If you check the bag provided, a lamp light is placed to ensure even low expo image has high intensity pixel. But I didn't successfully test on my bag anyway.