Operator Library: Accumulator
This operator returns the maximum pixel value found inside each input frame. The output frame has the same size as the input frame, where each pixel is replaced by the maximum value found in the image so far. If the current pixel is a new maximum the output Link IsMaxO is 1, otherwise it is 0.
![[Note]](../common/images/admon/note.png) |
Resource Consumption |
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The operator's FGPA resource consumption strongly increases with the parallelism. We recommend to use low parallelism at this operator. In many use cases of this operator, the parallelism can be reduced selecting the max parallel component prior to this operator. Use SplitParallel, MergeKernel and MAX for this operation. |
With every new input frame the maximum detection starts again. Additionally, it is possible to clear the current maximum manually when the ClrI link is set to 1. When a manual clear is not necessary, you must ensure a constant 0 at ClrI, to enable normal operation.
The following example shows the relation of the input pixel to the output values.
Often, this operator is used in conjunction with operators RemoveLine and RemovePixel to use only the last image pixel containing the results of all frame pixels.
Image Restrictions
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Empty Images
Empty images, i.e., images with no pixels, are allowed. The operator will output an empty image.
| Property | Value |
|---|---|
| Operator Type | O |
| Input Links | I, Image Input ClrI, Clear Input |
| Output Links | O, Data Output IsMaxO, binary output to indicate a new maximum |
| Link Parameter | Input Link I | Input Link ClrI | Output Link O | Output Link IsMaxO |
|---|---|---|---|---|
| Bit Width | [1, 64] unsigned, [2, 64] signed | 1 | as I | 1 |
| Arithmetic | {unsigned, signed} | unsigned | as I | unsigned |
| Parallelism | any | as I | as I | as I |
| Kernel Columns | 1 | as I | as I | as I |
| Kernel Rows | 1 | as I | as I | as I |
| Img Protocol | VALT_IMAGE2D, VALT_IMAGE1D, VALT_IMAGE0D | as I | as I | as I |
| Color Format | VAF_GRAY | as I | as I | as I |
| Color Flavor | FL_NONE | as I | as I | as I |
| Max. Img Width | any | as I | as I | as I |
| Max. Img Height | any | as I | as I | as I |
The use of operator FrameMax is shown in the following examples:
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Examples - The blob analysis operator is applied to an input camera image. The applet shows the usage of the blob data in the applet. In this case, the object with the maximum are is localized and the coordinates are used to cut out the object from the original image.
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'Functional Example for Specific Operators of Library Accumulator and Library Logic'
Examples - Demonstration of how to use the operator
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