Method for processing image data for display using backward projection

A method for processing image data for a vehicular vision system, said method comprising:

• providing a plurality of cameras at a vehicle so as to have respective fields of view exterior the vehicle;
• wherein each camera of the plurality of cameras comprises a two dimensional array of photosensing pixels;
• wherein providing the plurality of cameras comprises (i) mounting a rear camera at a rear portion of the vehicle so as to have a field of view at least rearward of the vehicle, (ii) mounting a left-side camera at a left side portion of the vehicle so as to have a field of view at least sideward of the vehicle, (iii) mounting a right-side camera at a right side portion of the vehicle so as to have a field of view at least sideward of the vehicle and (iv) mounting a front camera at a front portion of the vehicle so as to have a field of view at least forward of the vehicle;
• wherein, with the plurality of cameras mounted at the vehicle, the field of view of the left-side camera partially overlaps the field of view of the front camera and partially overlaps the field of view of the rear camera, and the field of view of the right-side camera partially overlaps the field of view of the front camera and partially overlaps the field of view of the rear camera;
• providing a video display screen in the vehicle, wherein the video display screen comprises a two dimensional grid of display pixels;
• providing a control having a data processor for processing image data captured by the plurality of cameras;
• processing, at the control, image data captured by the plurality of cameras utilizing backward projection from individual display pixels of the two dimensional grid of display pixels of the video display screen to respective photosensing pixels of the two dimensional array of photosensing pixels of each respective camera of the plurality of cameras;
• responsive to the processing at the control of image data captured by each camera of the plurality of cameras, displaying, at the video display screen, video images derived at least in part from the processed image data to provide a surround view display;
• and
• wherein processing image data captured by each camera of the plurality of cameras comprises restricting processing of photosensing pixels of each camera of the plurality of cameras to processing of only those photosensing pixels of each camera of the plurality of cameras that are used for the displayed video images.

A method for processing image data for a vehicular vision system, said method comprising:

• providing a plurality of cameras at a vehicle so as to have respective fields of view exterior the vehicle;
• wherein each camera of the plurality of cameras comprises a two dimensional array of photosensing pixels;
• wherein providing the plurality of cameras comprises (i) mounting a rear camera at a rear portion of the vehicle so as to have a field of view at least rearward of the vehicle, (ii) mounting a left-side camera at a left side portion of the vehicle so as to have a field of view at least sideward of the vehicle, (iii) mounting a right-side camera at a right side portion of the vehicle so as to have a field of view at least sideward of the vehicle and (iv) mounting a front camera at a front portion of the vehicle so as to have a field of view at least forward of the vehicle;
• wherein, with the plurality of cameras mounted at the vehicle, the field of view of the left-side camera partially overlaps the field of view of the front camera and partially overlaps the field of view of the rear camera, and the field of view of the right-side camera partially overlaps the field of view of the front camera and partially overlaps the field of view of the rear camera;
• providing a video display screen in the vehicle, wherein the video display screen comprises a two dimensional grid of display pixels;
• providing a control having a data processor for processing image data captured by the plurality of cameras;
• processing, at the control, image data captured by one camera of the plurality of cameras utilizing backward projection from individual display pixels of the two dimensional grid of display pixels of the video display screen to respective photosensing pixels of the two dimensional array of photosensing pixels of the one camera of the plurality of cameras;
• responsive to the processing at the control of the image data captured by the one camera of the plurality of cameras, displaying, at the video display screen, video images derived at least in part from the processed image data;
• and
• wherein processing image data captured by the one camera of the plurality of cameras comprises restricting processing of photosensing pixels of the one camera of the plurality of cameras to processing of only those photosensing pixels of the one camera of the plurality of cameras that are used for the displayed video images.