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MobiDv H18

building2_mDVH18_S.jpg
Picture of Buildings

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Comments:

Click here for same scene taken at the same time with MobiDV H10.

Click here for same scene taken by Olympus D580.

Sharpness Criteria:
Here is a comparison of the sharpness between pictures of this scene taken by MobiDV H18, H10 and D580.

building2_mDVH18_zm1_loc.jpg
Location of Zoom-in Below

building2_mDVH18_zm1.jpg
Zoom-in into Picture by H18

building2_mDVH18_zm1_H10.jpg
Zoom-in into Picture by H10

building2_mDVH18_zm1_D580.jpg
Zoom-in into Picture by D580

Considering the left vertical edge of the window in the zoom-in above, the pixel transition from one side of the edge to the other is 4 pixels for the H18 zoom-in, 2 pixels for the H10 zoom-in, and 2 pixels for the D580 zoom-in. 

Two pixel edge transitions is probably the best one can get from bayer image sensors. So, the picture taken with D580 is used as the benchmark for sharpness comparison with other digital cameras. The objective now is to find a quantitaive comparison of the sharpness in H18 pictures with respect to the D580.

Ratio of edge transition in 1 direction
= edge transition in H18 / edge transition in D580 = 4 / 2 = 2

Ratio of effective resolution 
= effective resolution for H18 / effective resolution for D580 = 3 MPixel / 4 MPixel = 0.75

Let Sharpness Discount Factor for H18 compared with D580
= ratio of effective resolution / ratio of edge transition in x and y directions =  0.75 / ( 2 x 2 ) = 0.1875

Sharp Pixel Count
 = effective resolution of D580 * Sharpness Discount Factor = 4 MPixel * 0.1875 = 750 000 Pixels

Therefore, the count of pixels that contributes to the sharpness of the image by H18 (3 MPixel image sensor) is 750 000.

High Dynamic Range:
Many regions of the trees in this scene are too dark in the H10 picture compared with the H18 one, as shown in the portion of the scene below. Thus, the H18 takes care of the dynamic range of light in the scene better than the H10.

building2_mDVH18_zm2_loc.jpg
Location of the Region Below

building2_mDVH18_zm2.jpg
Region in H18 Picture

building2_mDVH18_zm2_H10.jpg
Region in H10 Picture

Both these 2 pictures by H18 and H10 were taken using the same camera setting:

Aperture Size = F /3.5, Shutter Speed = 1 / 771 sec, ISO = 100
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