Picture of Pathway taken using MobiDv H18 Digital Camera

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MobiDv H18

Picture of Pathway

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

Click here for same scene taken by Olympus D580.

Comparison of Sharpness:
- The zoom-ins below are used to compare the sharpness of pictures of this scene taken by MobiDV H18, MobiDV H10, as well as the Olympus D580. The object used for the comparison is the frames of the windows at the far end of the pathway, as highlighted by the yellow box below.

Location of Zoom-in Below

Zoom-in into Picture by H18

Zoom-in into Picture by D580

Zoom-in into Picture by H10

The table below shows the number of pixels needed in the transition from black to white region for the vertical edge of the wall on the right of the zoom-in. One can also use the narrow vertical edge of the window frames, but it may not be fair in other situations when the distance between the edge in consideration and the camera lens are different for each picture taken by different cameras.

Camera Model Edge Transition for Edge of White Wall on Right of Image Pixel width of Veritcal Narrow Window Frame

Olympus D580 2 Pixels 2 Pixels

MobiDVH18 4 Pixels 4 Pixels

MobiDV H10
3 Pixels
3 Pixels

Sharpness Comparison between H18 and D580:

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.

Sharpness Comparison between H10 and D580:

The number of pixels for the transition in the H10 zoom-in is 3 pixels while it is 2 pixels in the D580 zoom-in.

Ratio of edge transition in 1 direction
= edge transition in H10 / edge transition in D580 = 3 / 2 = 1.5

Ratio of effective resolution
= effective resolution for H10 / effective resolution for D580 = 2 MPixel / 4 MPixel = 0.5

Sharpness Discount Factor for H10 compared with D580
= ratio of effective resolution / ratio of edge transition in x and y directions = 0.5 / ( 1.5 x 1.5 ) = 0.222

Sharp Pixel Count
= 4 MPixel * 0.222 = 888 000 Pixels

Comparison of Tile Patterns at the End of the Pathway:
Below shows comparisons of zoom-ins into the tile patterns at the end of the pathway in the scene.

Zoom-in into H18 Picture

Zoom-in into H10 Picture

Zoom-in into D580 Picture

More details of the tile patterns at the far end of the pathway can be seen in the Olympus D580 picture. In contrast, the tile patterns are either msising or very faint in the H10 and H18 pictures.

Blurring of Trees on Right-side of Picture:
- There are rows of bushes on the right side of the picture. Their leaves look blurred, as shown in the zoom-in below.

Leaves of the Bushes looks Blurred

Below shows zoom-in into the same region of the picture of the same scene taken by H10. Some regions of the trees in the shadows are too dark in the H10 picture compared to the one by H18.

Zoom-in into same region of H10 Picture

Camera Settings used:
H18 Picture: Aperture Size = F / 3.5, Shutter Speed = 1 / 1254 sec, ISO = 100

H10 Picture: Aperture Size = F / 3.5, Shutter Speed = 1 / 1254 sec, ISO = 100

Both cameras were set to auto mode when taking the picture of this scene.

Blurring in H18:
- The zoom-in below shows a comparison of a part of the scene between pictures taken by H18 and H10. The H18 zoom-in looks blurred compared to the one by H10.

Zoom-in into H18 Picture

Zoom-in into H10 Picture

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