about EPE

[Redreadblack]

hi, nice job! just with some confuse.
when I reproduce your work, I use the same datalist and cfgfile provided by your project: sceneflow_finalpass_train.txt & /sceneflow_finalpass_test.txt & cfgs/lightstereo/lightstereo_s_sceneflow.yaml.
But I got the result is follow: d1_all(4.5721) epe(1.3562) thres_1(17.5696) thres_2(12.2411) thres_3(5.4063)
In your result table, the result is:[LightStereo-S] 0.73 256x512
So I want to know where is problem.
I see the evalution size is 544*960 if cfgfile, differ from the 256x512 in your result table.
Is this maybe the reason?

And I see the train image size is 540*962, why the evalute size is 544*960

[chuanqi1997]

nice question！

[shenshanf]

在计算视差估计误差（EPE）时，需要特别注意图像缩放带来的影响。由于视差图在进行尺寸调整时，其视差值会同步缩放，这会直接影响到误差计算的准确性。
举个例子：假设原始视差图中某点的视差值为 d，当我们将视差图缩小到原来的 1/2 时，这个点的视差值会相应变为 d/2。如果直接在缩放后的尺寸上计算 EPE，得到的误差值也会是原始误差的 1/2，这显然不是我们想要的结果。为了得到真实的误差值，我们需要将计算结果放大两倍，以反映原始尺寸上的实际误差。
因此，为了保证误差计算的准确性，我们应该始终将 EPE 的计算统一到原始尺寸上进行。