![]() The resolving power of a lens can be calculated manually as well as in automated manner. To understand how the theoretical and practical methods of calculating resolving power differ, we will look at how these are done for e-con Systems’ See3CAM_CU135 in the next section.Ĭalculating the resolving power of See3CAM_CU135 – a 4K USB camera Below is a sample image of the resolution chart taken at an aspect ratio of 4:3.įigure 1: Enhanced ISO 12233 Resolution Chart ![]() To give you an example, if the aspect ratio considered for See3CAM_CU135 – 13MP USB camera – is 4:3, the image of the resolution chart has to be captured at that aspect ratio to finally arrive at the resolving power. ![]() Where PMAG = Sensor size / Field of view (FoV).Ĭalculating the resolving power of a given lens practicallyĬalculating the resolving power value of a camera lens practically involves taking into consideration the real aspect ratio of the camera.įor instance, if you want to calculate the resolving power of See3CAM_CU135 – 4K USB camera – with the default product lens, you should capture the image of the resolution chart with the desired aspect ratio at the prescribed working distance. Object space resolution in lp/mm = Image space resolution * PMAG. It defines the size elements of the object that can be resolved. This means the smaller the pixel size, higher will be the image space resolution value.Īs mentioned above, Object Space Resolution denotes the resolving power of a lens. Image space resolution is inversely proportional to the sensor’s pixel size. Image space resolution in lp/mm = 1000 / (2 * pixel size in μm) Therefore, image space resolution is theoretically calculated as: Generally, two pixels or one line pair is the highest frequency which can be resolved by a sensor – using the Nyquist frequency. Image Space Resolution is the resolution in the image plane in consideration of the sensor pixel size. We will now look at both the terms and learn now they are calculated. And object space resolution is derived from what is called the image space resolution. Resolving power is calculated as object space resolution. This can act as one of the criteria while choosing the best-fit lens for a given sensor and application. It means that calculating resolution in terms of lp/mm is extremely useful when comparing lenses. The ability to differentiate two bars as separate entities in a specific resolution would be based on the contrast level. The unit expresses the number of line pairs you can fit within one millimeter.Ī line pair is a pair of black and white lines next to each other with the same width and orientation. It is a measurement of spatial resolution used to calculate how small a detail in an image can be resolved by a lens. The resolving power of a lens is measured in line pair per millimeter or lp/mm. Theoretical calculation of the resolving power of a lens This is where knowing the resolving capacity of the lens becomes important.įor instance, if you are using See3CAM_CU135 – a 13 MP high-resolution USB camera from e-con Systems™ – to read barcodes, you need to make sure that the lens you pick can meet the maximum desired resolution. However, when you use a sensor with the desired resolution, it is also important to choose a lens that can help capture the level of detail expected from that resolution. This minimum distance depends on the resolution of the camera. ![]() You would have to differentiate the bars by allowing a certain amount of space between them. Let’s say you have to decode an object like a small barcode and that too at a longer distance. The resolving power of a lens is its ability to distinguish between two lines or points in an object or scene. What is resolving power of a lens, and why is it important? ![]()
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