Crop Images into smaller images

matt321 · April 2018

I am trying to work on a set of some very large images. My computer always freezes. I found that if I crop them into pieces I can do the analysis on each piece. Is there a way I a macro can crop the image into 4 or 6 images and do the analysis automatically?

Thanks
Matt

mbatchelor · April 2018

2018-04-02-101638

Matt321 --

If CROPPING the IMAGE and then analyzing the smaller IMAGE works it seems it would be possible to use multiple ROIs in sequence to perform the same type of operation. This might be easier to handle and potentially you could save the results from each ROI and then bring them all back into the image as a SUMMARY.

Either operation can be automated with using the PROJECT WORKBENCH but I think that automating the ROI option would be easier for a novice than the MULTIPLE IMAGE option.

If you turn on the RECORD MACRO TOOL and perform your ROI OPERATIONS or CROPPING OPERATIONS, then STOP RECORDING, the code that is generated should be a good start to a MACRO or an APP that would do what you want.

I hope this information is helpful.

-- Matt

YuriG · April 2018

Hi Matt321,

You can use the macro below as an example. It shows how the processing can be done using a loop and ROIs. The macro will go through the image creating ROIs of smaller size and calling DoROIProcessing function for every ROI. The sample macro just crops the ROI to a separate image, but you can extent it to add the processing you need.

    'process large image by smaller areas
    Public Sub ProcessImageByAreas
        Dim im As McImage=ThisApplication.ActiveImage
        If im Is Nothing Then Exit Sub
        'ROI parameters,
        Dim w As Integer=500'ROI width
        Dim h As Integer=500'ROI height
        Dim roi As Mediacy.IQL.Features.IMcRegions=im.Aoi'image ROI object
        'loop through smaller areas
        For i As Integer=0 To im.Height Step h
            For j As Integer=0 To im.Width Step w
                roi.SetBox(0,j,i,j+w-1,i+h-1)
                DoROIProcessing
                'activate the original window
                ThisApplication.Windows(im).Activate
            Next
        Next
        roi.Reset
    End Sub

    'do processing of single ROI
    Private Sub DoROIProcessing
        'for example - crop
        ThisApplication.ActiveImage.Duplicate
        'or do something else...
    End Sub

I've also attached the complete project.

Yuri

Crop Images into smaller images

Answers