Knowledge Base

Numerical Results

The Numerical Results sheet contains for each labeled print:

• Print – The full label of the print.
• Image – A picture of the full print. A larger version of this picture and other full paw prints from the current video frame are also displayed next to the Video window. You can use these pictures to detect possible classification errors.
• Initial Contact (s) – The time in seconds since the start of the run that the print first makes contact with the glass plate.
• Stand (s) – The duration of contact with the glass plate of the print.
• Max Contact At (s) – The time in seconds since the start of the run that the largest part of the print makes contact with the glass plate.
• Max Contact Area (Distance Unit²) – The surface area of the print at Max Contact expressed in the Distance Unit you selected in the Preferences.
• Max Intensity – The print's maximum intensity.
• Mean Intensity – The print's mean intensity.
• Print Length (Distance Unit) – This is the length (horizontal direction) of the complete print expressed in the Distance Unit you selected in the Preferences.
• Print Width (Distance Unit) – This is the width (vertical direction) of the complete print expressed in the Distance Unit you selected in the Preferences.
• Print Area (Distance Unit²) – This is the surface area of the complete paw print expressed in the Distance Unit you selected in the Preferences.

When you click a row in the Numerical Results table, the video jumps to the corresponding frame. When you play back the run, a blue hairline indicates the position of the run in the Video window.

Correct Errors

The following errors can occur:

• Labeling Error – A print is assigned an incorrect label. For example, left and right are swapped or the animal's nose touching the glass plate is labeled as one of the front paws.
• CatWalk Error – When an already labeled print overlaps with a subsequent unlabeled print, CatWalk automatically assigns the same label to the unlabeled print. This results in two different paws with the same label.
• Print Error – Two prints that are not part of the same paw are included in the same rectangle. This can occur, for example, when noise or another part of an animal's body is included in the rectangle around a paw print.

Labeling Error

In some cases during labeling, a wrong label was assigned to a print. The Graphical Results tab can help you in detecting errors. For example, when a print was labeled as Right Front while it should have been Left Front, this becomes visible in the Timing View.

To correct a labeling error, do the following:

1. Click the incorrectly labeled print in the Timing View to jump to the first frame of the corresponding print in the video image.
2. Draw a box around the incorrectly labeled print and from the menu select Reset.
3. Now draw a box around the unlabeled print and select the correct label, or draw a larger box around the unlabeled print and the labeled prints it belongs to.

CatWalk Error

A CatWalk error occurs when the same label is assigned to two different paws visible in the same frame. For example, when a paw is placed on the glass plate at the same position as a previous other paw.

A CatWalk error is automatically detected by the program and is displayed in a list in the Video section.

To correct a CatWalk error:

1. Select an error from the error list.
2. Click the rectangle of the incorrectly labeled print and from the menu select Reset. As a result, the print is reset and is now unlabeled.
3. Now assign the correct label to the appropriate print. The relabeled print now has the correct label and the error is removed from the error list.
4. If necessary, repeat steps 1 to 3 for the other errors.

Print Error

A Print error occurs when noise prints or another part of an animal's body is included in the rectangle around a paw print. For example, when an animal's abdomen touches the glass plate, part of the abdomen can be included in the rectangle of one of the hind paws.

You might be able to prevent Print errors by increasing the Green Intensity Threshold.

To correct a Print error, do the following:

1. Right-click the rectangle and select Remove Print.
2. If necessary, scroll back to the frame in which you removed the print.
3. Draw a box around the paw print and, from the menu, select Add Print.
4. Assign the correct label to the print.