Converting Display Coordinates to Screen Coordinates and Vice Versa

In my application I would like to determine the image coordinates of several positions by a mouse-click. The mouse-click however does not supply image coordinates but window coordinates instead. How can I convert those coordinate systems?

Display-Update After Changing Image Size or Dimension

When I switch ports with cameras that differ in resolution or bit-depth, the CVB display isn't updated properly.

Problems With PC-RGB Rev A9 Frame Grabbers

The IFC is unable to initialize the PCRGB and CVB can not load the CVPCRGB.vin driver what's wrong?

FAQ: CVB Image Manager

1:1 Display with CVB

How can I make sure that may images are displayed in their original size (1:1) in the CVB Display?

About Common Vision Blox

What is Common Vision Blox (CVB)?

Application Crash in the CVB Digital I/O Control Tutorials

The CVB DigIO tutorial causes a crash of the tutorial application when starting the Listener with the input of a low signal and then in the first messagebox pressing the Button NO (from the event).

Board Level Library Versions

How do I know what version of the board level software for my framegrabber the VIN driver needs?

Borland C++ Builder and CV Image Control

I get compilation errors when inserting the CVImage Control in Borland C++ Builder and building the application. Why?

Changing Zoomstate When Setting Images in CVB Display

How can I avoid changes in zoomstate when setting a new image handle in a CVB Display?

Common Vision Blox Licensing and Protection Scheme

How is Common Vision Blox copy protected?

Compilation of CVB Control-Wrappers with CBuilder

The compilation of the wrappers for the CVB Controls with the Borland CBuilder fails. Why?

Converting Display Coordinates to Screen Coordinates and Vice Versa

In my application I would like to determine the image coordinates of several positions by a mouse-click. The mouse-click however does not supply image coordinates but window coordinates instead. How can I convert those coordinate systems?

Copying CVB Images With memcpy

For speed reasons I want to copy my image data from one image to another one using the C-routine memcpy. How can I do this?

Create new images with CreateMatrixTransformedImage

What are the differences between the functions
CreateMatrixTransformedImage( ImgIn, Matrix, ImgOut ); and
CreateMatrixTransformedImageEx( ImgIn, Matrix, ImgOut );
of the Image DLL?

Custom error handling with the CVCError event.

How can I use customized error handling?

CVB Applications in the Autorun Group

Why do I get the error message "Dongle is not connected" when my CVB application is launched during the startup phase of my operating system (e. g. through an entry in the Autorun group or in the Registry)?

CVB Crosshair Overlay PlugIn Vertices

I found out that the Crosshair OPI's coordinates for one vertex are always 0 while dragging a Crosshair Overlay Object. Other OPIs do not show this behaviour - why?

CVB Display Coordinates on MouseClick.

How can I obtain the coordinates of a mouse click in a CVB display?

Demo Mode Limitations

What limitations are there to an unlicensed tool?

Destroying Listener Objects in the CVB Digital I/O Control

My program hangs when I call the CVB Digital I/O control's methods XXXListenerStop and XXXListenerDestroy (where XXX is either Bit or DWORD consecutively. Why?

Determining the CVB Root-Directory

How can I obtain the CVB root directory and then append a sub-path to it?

Display-Update After Changing Image Size or Dimension

When I switch ports with cameras that differ in resolution or bit-depth, the CVB display isn't updated properly.

Displaying a Histogram in Common Vision Blox

I would like to display the histogram of an image. The command ImageHistogram from the Common Vision Blox Image DLL only hands out an array of data. How can a display of those data be realised?

Displaying more than 8 Bits

I have a monochrome 12 Bit camera. How do I display the 12 Bit image in the CVB display?

Erratic Horizontal Lines in the Common Vision Blox Display OCX

The picture in the Common Vision Blox Display OCX is sometimes interrupted by a horizontal line. This is not depending on certain images nor does the effect occur permanently in the same image but only sporadically. Why?

Execution Time of CopyImageArea and DuplicateImage

The function DuplicateImage takes 20 ms to execute on a PIII 450 for one CCIR b/w image. The function CopyImageArea even takes significantly longer. Why?

Flickering of CVB Display setting the Zoom-Mode

I need images to be displayed at 1:1 zoom in CVB. My problem is that when I assign a new image to the Display, the display is flickering for a moment. How could I avoid this flicker?

How to create an RGB image from 3 mono images

I am using CVB Arithmetic with RGB images. Arithmetic works only on separate planes of the RGB image and therefore I receive as a result 3 monochrome images. So I have to compose these images to a RGB image. The CVB-function CopyImageArea does the job, but it is very slow (e.g. about 40 ms for a CCIR image). Is there another, faster possibility to do this?

How to Quickly Rotate an Image in CVB

What is the fastest way to rotate a (live) image in CVB?

How to Set the Image Origin in CVB

When I use the function CreateSubImage to cut out a part of an image and display the result it in a separate Display, the coordinate system that is used is obviously still from the original image. How can I set the image origin (0,0) into the upper left corner?

Image Creation and Reference Counting in Common Vision Blox

In my application I create new images at runtime using the DLL function CreateXXXImage. The application is running stable for some time, but then crashes with an OutOfMemory message. Where is the memory leak?

Image Scaling in CVB

Is it possible scale an image in CVB, e.g. to double the image size?

Imagenation PX200 and S-VHS Cameras

I have a PXC200 from Imagenation and a SVHS Camera. I use the VB VC Display Example but I dont see a live image. Why?

Initialization of the Display OCX in Delphi

If I load an image into the Image OCX and assign it to the Display OCX in the OnCreate routine in Delphi, the image is not shown when the program starts. Instead, in the place of the Display OCX the background of the windows desktop can be seen.

ITEX-based Drivers and Error Console

When opening the CVICPCI.vin driver, the ITEX Error Console opens even though it has been disabled in the ini-file. Why?

Loading Image Files other than *.bmp

After loading a TIF image the method IsGrabber returns true. Why?

Loading PXC200 Driver in OnInitDialog (Visual C++ 6)

When I load the CVB PXC200 driver (cvcpxc_nt.vin, cvcpxc_65.vin) in the Microsoft Visual C++ environment already in the OnInitDialog-Function l get an error message ("Error Loading Image File") from the driver if I am running the program inside Visual Studio. When using the generated *.EXE file this does not occur. Is there a workaround?

Memory leak in SaveWindowToBitmap() of CVdisplay.ocx

I use CVB 8.0.3. With every call of the SaveWindowToBitmap() function of the CVdisplay.ocx the Commit Charge increases. What can I do?

Mixing Use of the Display DLL and the Display OCX

The Common Vision Blox Display OCX als well as the Common Vision Blox Display DLL provide functions for displaying textual labels on a display. With the OCX methods it is no problem to position a label on a Display OCX, but calling the corresponding functions of the Display DLL on the Display OCX yields nothing. The same effect can be seen with other functions (e. g. Overlay management functions). What is the reason for this behaviour?

More than 8 bit images with CVB

Can I handle image with more than 8 bit with CVB?

Overlay Plug-In Objects in Visual Basic

I receive a "Run-time Error '13' with Type mismatch" in Visual Basic when I call the AddOverlayObject Method". Why?

Printing images from CVB

How can I print an image in CVB?

Problems when coding with the AVT driver from CVB 9.0.2

When trying to compile one of the samples that is installed with the AVT driver setup from Common Vision Blox 9.0.2 or trying to compile an application that uses teh CVAVT1394.vin driver together with the CVCPort -dll and the CVCDriver-dll I keep getting error messages from my compiler.

Problems with the VPAT and newer CVB Drivers

When I call the GetImageVPA function once at the beginning of my program and then use the acquired VPAT during the rest of the program, my software crashes with an access violation. Why?

PX610 Driver Shows Only Half an Image in CVB

When loading the PX-510 PX-610 driver (cvcpxa_95.vin, cvcpxa_NT.vin or cvcpxa_2k.vin) in any CVB tutorial program, only the upper half of the image is displayed, the lower half remains black. Why? Why is only a part of the image visible when I execute a CVB Tutorial program with the PX610 grabber ?

RemoveAllOverlayObjects is too slow

I have some troubles using the Display method RemoveAllOverlayObjects. When I am erasing a large number of overlays it takes up to several seconds to remove them! . How can I speed the removal of overlays up?

Requirements for VIN-Drivers to work correctly

What do I have to install that CVB works with an image aquistion device like a Framegrabber or a Camera?

Saving of Images With More Than 8 Bits per Pixel

Is it possible to save images with more than 8 Bits per pixel into an image file in CVB?

Settings of the Common Vision Display OCX

If I attune settings of the Display OCX (e. g. the selection of the color planes) in my development environment at design time, those settings are disregarded at runtime. How can I make preselections anyway?

Stripes on the CVB Display

When I have connected an interlaced camera to my Frame Grabber, I can see several large horizontal stripes in the Display of my CVB application, especially when I move the camera around while doing a live display. What's wrong?

Taking Single Shot Images from a Camera

I simply want to take an image from my CCD camera using Common Vision Blox and then process this image, but I cannot find any function suitable for taking a single image.

The CVB Dongle is not Recognized by CVB

Although my CVB dongle is attached to the parallel port, all CVB applications are only running in demo mode and the Common Vision Blox System Information resp. the Management Console (CVB 10) program also indicates 'Not licensed - using demo mode' instead of my serial number. What's up?

The Line OPI

I have a Line OPI, which I move on the display. How do I get the position of this line (in terms of start and end point coordinates of the Line)?

Turning off a Grab in the Blockready Event

Using the Linescan OCX of the Common Vision Blox Image Manager, I want to stop data acquisition by setting the continue parameter to FALSE in the OnAcqBlockReady event if the LastBlock parameter was TRUE.
If I do so, however, at least the first block of my image is overwritten. How do I prevent this from happening?

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