issue when sweeping illumination instead of exposure time

[paulandre123]

Hi Team,

I'm currently using this nice framework to assess my image sensor.
To do so, I am sweeping the irradiation of my light from dark to bright. at each step, I capture 2 images for the temporal part.
Then i take several pictures in the dark and the same amount at mid-range of the max irradiation for for the spatial part.
With this dataset, i can get all the results, except for the dark current since i only have one exposition time.

I tried to add several dark image with different exposition time to compute it but the emva1288loader triggers an error : "'All exposure must have at least 2 points: one dark and one bright"
Adding a second bright image at each exposure time does not solve the issue. (Error arise in the emva1288results since self.temporal['u_y'] and self.temporal['u_ydark'] do not have the same size.

Is this a desired limitations ? In theory, I should have enough information to fully characterized the sensor.

Thanks,

Paul

EDIT: This issue is more or less linked to the post here

file descriptor would look like this:

v 4.1
n 8 640 480
d 1000
i temporal_0_0.png
i temporal_0_1.png
b 1000 454.5454
i temporal_1_0.png
i temporal_1_1.png
...
b 1000 13181.818
i temporal_29_0.png
i temporal_29_1.png

b 1000.0 128.0
i spatial_b_0.png
...
i spatial_b_31.png
d 1000.0
i spatial_d_32.png
...
i spatial_d_63.png

not working with the following lines
d 2000.0
i darkcurrent_1_0.png
i darkcurrent_1_1.png
d 3000.0
i darkcurrent_2_0.png
i darkcurrent_2_1.png
d 4000.0
i darkcurrent_2_0.png
i darkcurrent_2_1.png

[fariza]

The code as it is today, will generate dark current values only when the full dataset is for changing exposure times.
You can do it by hand and it shouldn't be too difficult
We are planing to change the data format to be explicit about what images are intended for each purpose, hopefully this will allow to add images for dark current measurements even if your test was changing illumination

[fariza]

I'm closing as this limitation is by design, hope to change this in the future