Which is Better, HDR or WDR For Dash Cam?

2017-12-04

1085

Nowadays, the dash cam is becoming more and more popular, the brands of dash cam have sprung up, but the dash cam quality is not ideal with both the false parameters and function that are boasted by all kind of businesses. So we did need to be careful when we choose a hidden dash cam. This article is also to answer a netizen question to help everybody. 


What is WDR(wide dynamic technology): it simply means that both the particularly bright scene and the particularly dark scene can be seen clearly at the same time. The range of WDR is a ratio between the brightest signal value and the darkest light signal value.


dash cam hdr

 When Open HDR, the details of the sky will be supplemented


What is HDR(high dynamic range image): HDR is high dynamic illumination rending, we shoot in the environment of light and shade, the lens will be limited by the dynamic range. The whole picture will show a bright object to darken its surroundings. If it is in a particularly dark place, it will brighten the picture so that the photos are not overexposed or underexposed. So the image processed by HDR is not too bright or dark, whether it is a dark or bright. 


After understanding WDR and HRD, I also want to make a brief introduction to dynamic range.

The range of WDR is a ratio between the brightest signal value and the darkest light signal value. For example, if a machine can output The range of WDR is a ratio between the brightest signal value and the darkest light signal value.
dash cam wdr

Normally our eyes perceive about 100dB of light, and the sun is about 90dB compared at night, but the human eye can not see such a great contrast in brightness at the same time. When the eyes take some time to adjust the line from light to dark, and photosensitive elements are the same.


The different between WDR and HDR is that there are two different processing technologies, one is hardware technology and the other is software processing. WDR and HDR have the same function and purpose, in order to make clear images. At present, there are few HDR used in dash cam, some of them will be equipped on the high end of the Ambarella chip. To tell you a truth, the use of dash cam is still limited.



Editor's Recommendations:
what does wdr mean on dash cam

WDR VS HDR
Dash cam exposure settings
What is dash cam wdr 
dash cam setting