Sony released a new generation of global shutter sensors. In this article we tested the IMX267 (similar to IMX255) vs IMX536 / IMX546 / IMX566 for light sensitivity.
The IMX255 / IMX267 are Sony’s 2nd generation Pregius series and have a 3.45um pixel size. These sensor are widely used in Machine Vision, in many successful projects.
Sony offers a wide range of 3.45um sensors, like the:
The IMX536 / IMX546 / IMX566 are Sony’s latest 4th generation Pregius S sensor with a 2.74um pixel size. The IMX536 / IMX546 / IMX566 are based on back side illumination technology, making the pixel more light sensitive according to Sony. However due to the smaller pixel size, the question is whether the IMX536 / IMX546 / IMX566 are really more light sensitive compared to the IMX267 that has a larger pixel.
The 4th generation 2.74um Sony Pregius S sensors have the following lineup:
The main differences between the Sony IMX255, IMX267, IMX536, IMX546, and IMX566 image sensors lie in their resolution, frame rates, generation and features. Here's a breakdown of the key differences:
|
Image sensor |
IMX255 |
IMX267 |
IMX536 |
IMX546 |
IMX566 |
|
Resolution |
4112 x 2176 |
4112 x 2176 |
2856 x 2848 |
2856 x 2848 |
2856 x 2848 |
|
Total Pixels |
8.9 MP |
8.9 MP |
8.1 MP |
8.1 MP |
8.1 MP |
|
Pixel Size |
3.45 μm |
3.45 μm |
2.74 μm |
2.74 μm |
2.74 μm |
|
Optical Format |
1” |
1” |
2/3” |
2/3” |
2/3” |
|
Generation |
Pregius 2nd Gen |
Pregius 2nd Gen |
Pregius S 4th Gen |
Pregius S 4th Gen |
Pregius S 4th Gen |
|
Speed |
High-speed |
Standard-speed |
High-speed |
Standard-speed |
Standard-speed |
The Sony IMX267 has the same light sensitivity as the IMX255, as both have the same 3.45um pixel technology. In this test, the exposure time is 10ms and the gain is 0. Adding no gain, means that we add no additional noise. The light sensitivity of the IMX267 / IMX255 looks slightly better, however, it’s almost neglectable. Also, the IMX267 / IMX255 looks to have slightly more contrast.
For most applications the difference is so minimal, that both the IMX267/IMX255 and the IMX536 / IMX546 / IMX566 will be a good fit, but the IMX267 / IMX255 is the winner in this test.
*Compromised for web performance, you can download original files here.
Different generation of Sony Pregius global shutter image sensors also have different gain patterns. In some applications, noise due to gain can be acceptable. Using software algorithms, noise can also be reduced. The strengths of reduction, depends also on the noise pattern. In this example, we use an exposure time of 10ms and a gain of 16db. Again, the IMX267 / IMX255 has slightly more contrast, also the noise pattern is better, when you look at the light gray blocks in the corner.
Overall, both IMX267 / IMX255 and IMX536 / IMX546 / IMX566 perform very well with a gain of 12dB, once again the IMX267 / IMX255 is the winner.
Besides the digital gain, you can also use digital shift to increase the light sensitivity. With digital shift, you use the last 8 bits of a 12 bit image, instead of the first 8 bits. As a result, you only use the bits that contain the “darkest” information of the image. These bits are relative noisy. Adding then an additional gain, makes the images even more noisy. In the example below, we used for the first 2 images an exposure time of 0.3ms and a gain of 16dB. For the IMX536 / IMX546 / IMX566, these are the maximum parameters you can use. The Sony IMX267 / IMX255 however, can also be operated with a gain of 24dB. Therefore, we added a 3rd image, showing the difference between 16 and 24dB.
First, there is a small difference in color, this can be solved by a white calibration. The noise behavior on the white parts of the images are similar with both image sensors. Once again, in the light gray area, the IMX267 / IMX255 outperforms the IMX536 / IMX546 / IMX566. Additionally, the IMX267 / IMX255 has the option to further increase the gain to 24dB, making the IMX267 / IMX255 sensor the most light sensitive sensor.
First, we want to emphasize that all Sony IMX267/IMX255/IMX536/IMX546/IMX5466 global shutter sensors are very light sensitive, especially when you compare it with the competition, like Gpixel and Onsemi sensors. Therefore, both the IMX267/IMX255 and the IMX536 / IMX546 / IMX566 are a very good choice.
If you have a machine vision application operating in a situation where light sensitivity is critical, then we would recommend going for the IMX267/IMX255 image sensor, as it slightly outperforms the IMX536 / IMX546 / IMX5466 However, for most applications, when no gain is used, both sensors perform the same.
The IMX267/IMX255 has a 3.45um pixel size. This bigger pixel size requires industrial lenses with less resolving power, the then IMX536 / IMX546 / IMX566 with a 2.74um pixel size. As a result, the lens of an IMX267/IMX255 might be cheaper and there is bigger availability. Especially looking at very light sensitive F1.4 lenses.
On the other hand, the smaller images sensor of the IMX536 / IMX546 / IMX566, makes it ideal to use with M12 lenses or lenses with a larger opening angle. Therefore, with this sensor, you are more flexible in opening angles and the use of M12. However, there is a chance that these lenses are not designed for the 2.74uM pixel size, resulting in a slightly less sharp image. For many applications, the less sharp image is still acceptable.
To learn more about lens resolving power and how it relates to your camera's sensor, check out this article: "How to select the best lens resolution for the pixel size of your camera".
Now that you understand the key differences between IMX267/IMX255 and IMX536 / IMX546 / IMX566, you can make an informed decision about the best sensor for your machine vision project. However, the sensor is just one piece of the puzzle. GeT Cameras offers a wide range of machine vision cameras featuring Sony Pregius sensors and more, including both IMX267/IMX255 and IMX536 / IMX546 / IMX566 in GigE and USB3 interfaces. Our experienced team can help you select the perfect camera for your specific needs and application.
We have camera models equipped with the IMX546 sensor, available in GigE interface. Our models include the GigE version MER3-800-36G3M-P and MER3-800-36G3C-P. These cameras provide high-quality imaging performance for various applications.
