set_grayvalset_grayvalSetGrayvalSetGrayvalset_grayval (算子名称)

名称

set_grayvalset_grayvalSetGrayvalSetGrayvalset_grayval — Set single gray values in an image.

参数签名

描述

set_grayvalset_grayvalSetGrayvalSetGrayvalSetGrayvalset_grayval sets the gray values of the input image ImageImageImageImageimageimage at the positions (RowRowRowRowrowrow,ColumnColumnColumnColumncolumncolumn) to the values specified by GrayvalGrayvalGrayvalGrayvalgrayvalgrayval. If ImageImageImageImageimageimage is a multi-channel image, you can either set a single gray value for a pixel and thus set it for all available channels, or you can set the gray values g for all channels individually by concatenating them within GrayvalGrayvalGrayvalGrayvalgrayvalgrayval. For example, for a three-channel image three gray values (according to the order of the channels) are specified for each pixel: [g(channel0,pixel0), g(channel1,pixel0), g(channel2,pixel0), g(channel0,pixel1), ... ]. Please note that for complex or vector field images, two gray values per pixel must be specified (per channel).

If the image is of type direction, gray values that are not in the value range that is valid for direction images are set to the value 255 to mark them as invalid.

注意

The operator set_grayvalset_grayvalSetGrayvalSetGrayvalSetGrayvalset_grayval produces quite some overhead. Typically, it is used to set single gray values of an image. It is not suitable for programming image processing operations such as filters. In this case it is more useful to use the operator get_image_pointer1get_image_pointer1GetImagePointer1GetImagePointer1GetImagePointer1get_image_pointer1 and to directly use the C or C++ interface for integrating own procedures.

Note also that set_grayvalset_grayvalSetGrayvalSetGrayvalSetGrayvalset_grayval modifies the content of an already existing image (ImageImageImageImageimageimage). Besides, even other image objects may be affected: For example, if you created ImageImageImageImageimageimage via copy_objcopy_objCopyObjCopyObjCopyObjcopy_obj from another image object, set_grayvalset_grayvalSetGrayvalSetGrayvalSetGrayvalset_grayval will also modify the image matrix of this other image object. Therefore, set_grayvalset_grayvalSetGrayvalSetGrayvalSetGrayvalset_grayval should only be used to overpaint newly created image objects.

运行信息

• Multithreading type: reentrant (runs in parallel with non-exclusive operators).
• Multithreading scope: global (may be called from any thread).
• Processed without parallelization.

This operator modifies the state of the following input parameter:

• ImageImageImageImageimageimage

During execution of this operator, access to the value of this parameter must be synchronized if it is used across multiple threads.

参数表

结果

set_grayvalset_grayvalSetGrayvalSetGrayvalSetGrayvalset_grayval returns 2 ( H_MSG_TRUE) if all parameters are correct. If the input is empty the behavior can be set via set_system(::'no_object_result',<Result>:)set_system("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>)set_system("no_object_result",<Result>). If necessary, an exception is raised.

可能的前置算子

read_imageread_imageReadImageReadImageReadImageread_image, get_image_pointer1get_image_pointer1GetImagePointer1GetImagePointer1GetImagePointer1get_image_pointer1, gen_image_protogen_image_protoGenImageProtoGenImageProtoGenImageProtogen_image_proto, gen_image1gen_image1GenImage1GenImage1GenImage1gen_image1

可替代算子

get_image_pointer1get_image_pointer1GetImagePointer1GetImagePointer1GetImagePointer1get_image_pointer1, paint_graypaint_grayPaintGrayPaintGrayPaintGraypaint_gray, paint_regionpaint_regionPaintRegionPaintRegionPaintRegionpaint_region

参考其它

get_grayvalget_grayvalGetGrayvalGetGrayvalGetGrayvalget_grayval, gen_image_constgen_image_constGenImageConstGenImageConstGenImageConstgen_image_const, gen_image1gen_image1GenImage1GenImage1GenImage1gen_image1, gen_image_protogen_image_protoGenImageProtoGenImageProtoGenImageProtogen_image_proto

模块

Foundation

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