The Pixel Addressing feature controls the number of pixels that are read from the ROI.
Pixel Addressing is controlled by two parameters – a Pixel Addressing mode and a value. The mode of Pixel Addressing can be decimate (0), averaging (1), binning (2) or resampling (3).
With a Pixel Addressing value of 1, the Pixel Addressing mode has no effect and all pixels in the ROI will be returned. For Pixel Addressing values greater than 1, the number of pixels will be reduced by the square of the value. For example, a Pixel Addressing value of 2 will result in ¼ of the pixels.
The Pixel Addressing mode determines how the number of pixels is reduced. The Pixel Addressing value can be considered as the size of a block of pixels made up of 2x2 groups. For example, a Pixel Addressing value of 3 will reduce a 6 x 6 block of pixels to a 2 x 2 block – a reduction of 4/36 or 1/9.
The decimate mode will drop pixels all the pixels in the block except for the top-left group of four. At the highest Pixel Addressing value of 6, a 12 x 12 block of pixels is reduced to 2 x 2. At this level of reduction detail in the scene can be lost and color artifacts introduced.
The averaging mode will average pixels with the similar color within the block resulting in a 2x2 Bayer pattern. This allows details in the blocks to be detected and reduces the effects of the color artifacts.
The binning mode will sum pixels with similar color within the block reducing the block to a 2x2 Bayer pattern. Unlike binning with CCD sensors, this summation occurs after the image is digitized so no increase in sensitivity will be noticed but a dark image will appear brighter.
The resampling mode uses a different approach involving the conversion of the Bayer pattern in the blocks to RGB pixels. With a Pixel Addressing value of 1, resampling has no effect. With a Pixel Addressing mode of 2 or more, resampling will convert the block of 10-bit pixels to one 30-bit RGB pixel by averaging the red, green and blue channels. Setting the video format to YUV422 mode will result in the best image quality while resampling. Resampling will create images with the highest quality and the least artifacts.
Pixel Addressing will reduce the amount of data coming from the camera. However, only the Decimate mode will permit an increase in the frame rate. Averaging, binning and resampling modes will have the same frame rate as if the Pixel Addressing value was 1 (no decimation.)
Pixel Addressing works in the same fashion with color or monochrome sensors.
The PL-A741 cameras support decimation only, and values of 1 or 2.
The PL-A742 cameras support decimation, averaging, binning and resampling, and values of 1 or 2.
The PL-A770 cameras support decimation, averaging, binning and resampling, and values of 1, 2 or 4.
The PL-A780 cameras support decimation, averaging, binning and resampling, and values of 1, 2, 3, 4 or 6.
|
Camera |
Auto |
Manual |
One-time Auto |
Off |
CiD |
|
All cameras |
No |
Yes |
No |
Yes |
Yes |
|
Camera |
Parameter |
Unit |
Type |
Min |
Max |
Default |
Step Size |
Comments |
|
PL-A741 |
Mode |
None |
Absolute |
0 |
0 |
0 |
1 |
0: Decimate |
|
|
Value |
None |
Absolute |
1 |
2 |
1 |
1 |
|
|
PL-A742 |
Mode |
None |
Absolute |
0 |
3 |
0 |
1 |
0: Decimate, 1: Average, 2: Bin, 3: Resample |
|
|
Value |
None |
Absolute |
1 |
2 |
1 |
1 |
|
|
PL-A770 |
Mode |
None |
Absolute |
0 |
3 |
0 |
1 |
0: Decimate, 1: Average, 2: Bin, 3: Resample |
|
|
Value |
None |
Absolute |
1 |
4 |
1 |
1 |
Pixel Addressing Value of 3 is not supported |
|
PL-A780 |
Mode |
None |
Absolute |
0 |
3 |
0 |
1 |
0: Decimate, 1: Average, 2: Bin, 3: Resample |
|
|
Value |
None |
Absolute |
1 |
6 |
1 |
1 |
Pixel Addressing Value of 5 is not supported |