Pixel density Tools |
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Pixel density Tools |
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Pixel density
Tools
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Pixel density Tools |
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Pixel density Tools |
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Distances to the far borders of regions Field of View sizes at far borders of regions Expanded image from the Table of regions
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In this combo box the name of the chosen pattern of pixel density is shown. You can choose any pattern from 30 patterns of pixel density. Parameters of the chosen pattern are displayed and can be edited in the Pixel density box. The name of the pattern can be edited in this box, when the Edit button is pressed.
As a result of right-click on the combo box a pop up menu will appear. Selecting the Default patterns item, you can erase all changes in the patterns and return to the patterns set by default in current version of VideoCAD.
The box is inaccessible when the Active camera box is checked.
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If the checkbox is checked, a pattern assigned to the active camera is automatically displayed in the pixel density box. The Pattern combo box will become inaccessible for editing.
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Edit the chosen pattern. Clicking on the Edit button makes parameters of the chosen pattern accessible for editing. The button caption is changed to Save - stop editing and save the modified pattern.
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The switch allows to choose direction (horizontal or vertical) to which the pattern criterion must be applied.
The switch is accessible for editing in the Editing mode.
When calculating pixel density, the influence of rotation of the camera around its axis on the position of the vertical and horizontal in the frame is determined using the When rotating camera around its axis or in corridor mode, bind horizontal/ vertical combobox in the Options box.
Changing the pixel density under the influence of the lens distortion is considered along radial rays from the center of the frame to the edges, without distinguishing between horizontal and vertical.
See also: Calculating pixel density
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In the box you can choose a criterion according to which regions in the pattern will differ.
You can choose one from 4 criteria:
Direction of the criterion (vertical/height or horizontal/width) can be specified by the Vert.//Hor.switch
Meters or feet as a unit of height are selected automatically depending on the format of measurements in the project.
Pattern criterion of pixel density for panoramic cameras must be based on the pixel density (Pixel per meter (Pixel per foot), Pixel for object), but not on the field of view size. Criterion Field-of-view height, % of Field-of-view for object are not suitable to panoramic cameras, because of panoramic cameras have not a stable field of view.
The box is accessible for editing in the Editing mode.
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The box is accessible for editing in the Editing mode.
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Height (width) of the object for the criteria associated with an object: Pixel for object and % of Field-of-view for object.
The caption is changed according to the Vert./Hor. switch.
The box is accessible for editing in the Editing mode.
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Draw legend of the current Pixel density pattern on the Graphics area. After choosing this button specify place of the legend on the Graphics area of the Graphics window. You can select font type on the font type panel before placing or after double clicking near to the left top corner of the legend. By means of font type you can change size and color of the legend. You can also make the legend scalable or nonscalable. Legend is tied with his Pixel density pattern. If parameters of the pattern is changed then the legend will be changed too. You can place several legends of different patterns on the same layout.
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Show the regions in the Pixel density box hatched or filled by blend translucent colors.
This box affects displaying regions in the Pixel density box only. Hatch or fill regions in the Graphics window can be determined separately for each camera using the Fill projections button.
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Assign chosen pattern to the Active camera. If the To selected cameras box is checked, then the chosen pattern is assigned to all selected cameras.
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Vert.(Horiz.) number of pixels
Attention! The purpose of this combo box differs in Starter, Lite and Professional versions!
The caption is changed according to the Vert./Hor. switch.
Vertical (horizontal) number of pixels for modeling images on the far bounds of regions. Images on the bounds of regions depend not only on the criterion value, but also on the number of pixels.
Thus, for criteria related to the number of pixels which covers a specified height (width) (Pixel per meter, Pixel for object) value of the criterion determines the pixel density, ie how detailed the scene is photographed. In this case, Vert.(Horiz.) number of pixels determines the size of the field of view.
Conversely, for criteria related to the height (width) of the field of view (Field-of-view height(width),% of Field-of-view for object) criterion value determines the size of the field of view. In this case, Vert.(Horiz.) number of pixels determines the pixel density, ie how detailed the scene is photographed.
The box is accessible for editing if the Active camera box is not checked.
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If the checkbox is checked, the displayed Pixel Density Pattern will be assigned to new cameras by default. To assign the displayed pattern to new cameras, mark this checkbox.
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When this box is checked, the number of pixels of the Active camera is assigned to the Vert.(Horiz.) number of pixel box. The Vert.(Horiz.) number of pixel box becomes inaccessible for editing.
For calculation the minimal number of pixels from parameters of camera image sensor and parameters of output image is used. Number of pixels of image sensor is specified on the Sensitivity and Resolution box. Number of pixels of output image is specified on the Processing tab of the Image parameter panel. If number of pixels is not set (N/A), calculation is performed for vertical 720 pixels (or horizontal 1280 pixels).
When calculating pixel density, the influence of rotation of the camera around its axis on the position of the vertical and horizontal in the frame is determined using the When rotating camera around its axis or in corridor mode, bind horizontal/ vertical combobox in the Options box.
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In rows of this table you can see and edit parameters of regions of the chosen pixel density pattern.
The bottom row of the table corresponds the nearest to the camera region.
On the first column of the table, on the background rectangles filled by a color assigned to the region, the Name of the region and the Criterion value at the far bound of region are displayed.
Images in Resolution and Field of view columns are automatically generated according to the criterion value of each region and the Vert.(Horiz.) number of pixel value. The images visualize the boundary values of the criterion.
The height of "men in blue shirt" is 2 meters (about 6.5 feet).
In the Editing mode the Names of regions and the Criterion values become accessible for editing. In addition the Type of hatching combo boxes
In the Type of hatching combo boxes
Hatching will be visible in the Pixel density box when the Blend/Hatch box is not checked. In the Graphics window, hatching of the chosen type will be shown for cameras, which have chosen Hatching in the menu of the Fill projections button.
Color of region is the same for filling and for hatching.
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Expanded image from the Table of regions
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By moving the slider, you can enlarge the pictures in the Resolution column. On the left half of the slider the scaled pictures will be displayed with constant resolution and variable field of view. In the right half of the slider scale, pictures will be displayed with a constant field of view and variable resolution.
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Using To file or From file buttons you can save pixel density patterns to file or load from file. As a result of clicking on the Default button, patterns installed by default in this version of VideoCAD will be restored.
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See further : Work with the Pixel density box.
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