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Results

In our experiment, we take three groups of LDR pictures and try to construct three HDR pictures from them. For each group of these pictures, we take 6 LDR pictures with different exposure times. We’ll display the response curve for each color channel: red, blue and green and our final HDR picture.

Group 1

Figure1.
Response Function for Channel Red

Figure2.
Response Function for Channel Green

Figure3.
Response Function for Channel Blue

Figure4.
LDR picture with exposure time 1/50s

Figure6.
LDR picture with exposure time 1/125s

Figure6.
LDR picture with exposure time 1/320s

Figure7.
LDR picture with exposure time 1/800s

Figure8.
LDR picture with exposure time 1/1600s

Figure9.
LDR picture with exposure time 1/4000s

Figure10.
Final HDR picture for Group 1

Comment: It’s impressive to see the details both of the light and of the clothes. For these kind of pictures, it’s always easy to lose the details of the light since the pixel values of the area around the light will get saturated. But, through HDR, we could keep the details of the light without losing any other details.

Group 2

Figure11.
Response function for Channel Blue

Figure12.
Response function for Channel Green

Figure13.
Response function for Channel Red

Figure14.
LDR Picture with exposure time 1/50s

Figure15.
LDR Picture with exposure time 1/100s

Figure16.
LDR Picture with exposure time 1/400s

Figure17.
LDR Picture with exposure time 1/1000s

Figure18.
LDR Picture with exposure time 1/2000s

Figure19.
LDR Picture with exposure time 1/4000s

Figure20.
Final HDR picture for Group 2

Comment: Once again, we almost see the details of the lamb. Although it’s distorted a bit, we know there’s something in it, instead of just completely white for the whole area. What’s amazing is that we could clearly see what’s going on in the background. All the details of the bags are clearly revealed.

Group 3

Figure21.
Response Function for Channel Blue

Figure22.
Response Function for Channel Green

Figure23.
Response Function for Channel Red

Figure24.
LDR Picture with exposure time 1/160s

Figure25.
LDR Picture with exposure time 1/320s

Figure26.
LDR Picture with exposure time 1/640s

Figure27.
LDR Picture with exposure time 1/1250s

Figure28.
Final HDR Picture for Group 3

Comment: Once again, we could see a lot of details both in over-exposed area and in under-exposed area. For example, we could see some words on the white container on the right hand side of the lamb. It’s impossible for us to see those words when we take a picture with relatively large exposure time. Similarly, we could see the details in the dark area. For example, we could see that there’s a purple/blue stuff lying on the black bag. However, it’s likely that we’ll barely see it when the exposure time of the picture is relatively small.

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Source:  OpenStax, High dynamic range imaging. OpenStax CNX. Dec 18, 2012 Download for free at http://cnx.org/content/col11471/1.1
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