Sensor resolution
Is the sensor on the effective number of non-interpolated pixels.
Image resolution
A digital image's resolution is determined by the number of pixels Deputy image.
A 5 million pixel image, usually long 2,560 pixel, high 1,920 pixel, its resolution is 4,915,200 pixel. In the previous "pixel" topic, and we already know: the exhaustion of effective pixel camera to take out the high resolution photos. However, using the interpolation method gets more high-resolution, ineffective, but takes up more space on the storage card. Unless the storage card capacity is insufficient, or whenever we all should use the camera's high-resolution photography, to get the best picture quality,Resolution test chart: horizontal and vertical LPH
We have numerous camera evaluation once seen following chart, this picture is what use is it?, in fact, this is a camera with a resolution test chart, it is in accordance with standard ISO 12233 PIMA/.
This is a well-designed chart, not only to test the horizontal and vertical resolution, but also test the sensor to different point of view graphics response capacity. Ready to purchase a digital camera of a friend, you can pass the resolution test chart, learn about the various camera resolution and horizontal comparison.Nikon CP8700 resolution chart, the red area to drop most of
Enlarge A picture. Until the "16" this location before the black and white lines clear, easy to distinguish. Therefore, the level of value is 1600 LPH. Enlarge figure B. Until the "15" this location before the black and white lines clear, easy to distinguish. Therefore, a vertical LPH value is 1500.Horizontal LPH means the horizontal axis (x axis) direction observation, in the whole picture can see clearly the number of vertical lines.
In the above to enlarge A picture, we can see 9 black line and 8 white line white, the "16", line still clear. But the "17" this place, black and white line becomes increasingly difficult to distinguish. Enlarge figure A in the location of the "16" a total of 17 straight (9 + 8), and the width of the 17 straight is 26 pixel width. Because the sample height CP8700 2,448 pixel, each pixel height of the number of vertical lines is 2,448/26 * 17 or sample of the horizontal resolution is 1,600 LPH. Therefore, the resolution test chart "16" represents a sample of height can cover 1,600 lines, namely 1, 600LPH (per picture height).Similarly, vertical LPH means to vertical axis (y axis) direction observation, in the whole picture can see clearly the number of horizontal lines.
Enlarge figure B tells us that the proofs of approximately vertical resolution is 1,500 LPH.Due to the resolution of the image height is "normalized", so we can pass resolution test chart, contrast imaging of the aspect ratio of the different digital camera resolution.
It is precisely because of the height of the "photo size", we can pass photo aspect ratio, the level of the vertical lines LPH launched the absolute value, or by vertical LPH launched horizontal lines of absolute value.
For example, the vertical lines of absolute value equal to the level of LPH multiplied by the aspect ratio. In the above example, CP8700 we know horizontal LPH 1,600, camera image aspect ratio is 4: 3, so the sample of vertical lines of absolute value by calculating the available: 1,600 x 1.333 = 2,133.Wise readers see here will find: 3,200,000 (2,133 x 1,500) obvious than sample resolution 8,000,000 (3,264 x 2,448).
In fact, the reason is very simple, because digital camera sensor color filter array device needs to be interpolated, in addition, many anti-aliasing filter camera also need interpolation calculations. However, in the previously mentioned Foveon sensor, image resolution and sensor resolution closer. Optical system of limited so many digital cameras have to use a small sensor to get sharp images, it also affects the image resolution.
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