Operator RowMax

Operator Library: Accumulator

This operator returns the maximum pixel value found inside each image row. Each input pixel value is replaced by the maximum pixel value found in the very same row so far. If the current pixel is a new maximum the output Link IsMaxO is 1, otherwise it is 0.

[Note] Resource Consumption

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.

Every new row restarts the maximum detection. Additionally, it is possible to clear the current row maximum manually when the ClrI link is set to 1. When a manual clear is not required, you must ensure a constant 0 at ClrI.

Often, this operator is used in conjunction with operator RemovePixel to use only the last column containing the results of the full frame. Note that the operator will require additional resources with increased parallelism. If only the maximum of each row without intermediate results is required, it is possible to determine the maximum of the parallel words first.

The following example shows the relation of input values to output values.

Image Restrictions

  • Image Size

    Varying line lengths and empty lines are allowed in non-empty images.

  • Empty Images

    Empty images, i.e., images with no pixels, are allowed. The operator will output an empty image.

I/O Properties

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

Supported Link Format

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_LINE1D, VALT_PIXEL0D} 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

Parameters

None

Examples of Use

The use of operator RowMax is shown in the following examples:

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