Specify the size of the rotated matrix. If you select Expanded to fit rotated input image, the block outputs a matrix that contains all the rotated image values. If you select Same as input image, the block outputs a matrix that contains the middle part of the rotated image. As a result, the edges of the rotated image might be cropped. Use the Background fill value parameter to specify the pixel values outside the image.

Specify how to enter your rotation angle. If you select Specify via dialog, the Angle (radians) parameter appears in the dialog box.

If you select Input port, the Angle port appears on the block. The block uses the input to this port at each time step as your rotation angle. The input to the Angle port must be the same data type as the input to the I port.

Enter a real, scalar value for your rotation angle. This parameter is visible if, for the Rotation angle source parameter, you select Specify via dialog.

When the rotation angle is a multiple of pi/2, the block uses a more efficient algorithm. If the angle value you enter for the Angle (radians) parameter is within 0.00001 radians of a multiple of pi/2, the block rounds the angle value to the multiple of pi/2 before performing the rotation.

Enter the maximum angle by which to rotate the input image. Enter a scalar value, between 0 and $$\pi$$ radians. The block determines which angle, $$0\le angle\le \max angle$$, requires the largest output matrix and sets the dimensions of the output port accordingly.

This parameter is visible if you set the Output size parameter, to Expanded to fit rotated input image, and the Rotation angle source parameter toInput port.

Specify how the image is rotated. If you select Center, the image is rotated about its center point. If you select Top-left corner, the block rotates the image so that two corners of the rotated input image are always in contact with the top and left sides of the output image.

This parameter is visible if, for the Output size parameter, you select Expanded to fit rotated input image, and, for the Rotation angle source parameter, you select Input port.

Specify the value computation method. If you select Trigonometric function, the block computes sine and cosine values it needs to calculate the rotation of your image during the simulation. If you select Table lookup, the block computes and stores the trigonometric values it needs to calculate the rotation of your image before the simulation starts. In this case, the block requires extra memory.

Specify a value for the pixels that are outside the image.

Specify which interpolation method the block uses to rotate the image. If you select Nearest neighbor, the block uses the value of one nearby pixel for the new pixel value. If you select Bilinear, the new pixel value is the weighted average of the four nearest pixel values. If you select Bicubic, the new pixel value is the weighted average of the sixteen nearest pixel values.

The number of pixels the block considers affects the complexity of the computation. Therefore, the Nearest-neighbor interpolation is the most computationally efficient. However, because the accuracy of the method is proportional to the number of pixels considered, the Bicubic method is the most accurate. For more information, see Nearest Neighbor, Bilinear, and Bicubic Interpolation Methods in the Computer Vision Toolbox™ User's Guide.

Select the rounding mode for fixed-point operations.

Select the overflow mode for fixed-point operations.

Choose how to specify the word length and the fraction length of the angle values.

This parameter is only visible if, for the Rotation angle source parameter, you select Specify via dialog.

As depicted in the previous figure, the output of the multiplier is placed into the product output data type and scaling. Use this parameter to specify how to designate this product output word and fraction lengths.

As depicted in the previous figure, inputs to the accumulator are cast to the accumulator data type. The output of the adder remains in the accumulator data type as each element of the input is added to it. Use this parameter to specify how to designate this accumulator word and fraction lengths.

Choose how to specify the word length and fraction length of the output of the block:

Select this parameter to prevent the fixed-point tools from overriding the data types you specify on the block mask. For more information, see fxptdlg (Fixed-Point Designer), a reference page on the Fixed-Point Tool in the Simulink^® documentation.